The Lightblade Learning Lab with Russ Sadler
The Lightblade Learning Lab is a series of videos that Russ did for Thinklaser Limited based on using the Lightblade 4060 Laser Cutting and Engraving Machine. Thinklasers Lightblade 4060 has a 400 x 600mm bed size and was supplied with a 60W EFR laser tube. In this session, Russ will show you how to laser cut Leather and hide, as well as the art of laser engraving leather.
Contents
- Types of leather
- Natural tanned hide
- Chromate tanning
- Overview of available lenses and nozzles
- Watch for airflow
- Keeping things flat
- Using paper towel to check if the edges are sooty.
- Cut from the reverse side to protect the surface from smoke contamination.
- Using masking tape or transfer paper (available in wide rolls) to protect the surface.
- Engraving is even worse for smoke contamination.
- Using the universal engraving nozzle with a 2″ lens and minimum air assist.
- Lots of surface debris
- Using the universal engraving nozzle with a compound lens
- Possible solution; bitmap at low resolution
- Best result: compound lens with bitmap image at 254DPI at 15% power (60W tube) and 400mm/s air assist off, universal engraving nozzle.
- Scanning Reverse Compensation
- RDWorks Bitmap handle and image adjustment
- Not possible to get fine resolution when laser engraving leather from 100 watt plus tubes
- Chromate tanned leather – soft leather
- Start with maximum power (at safe current) with organics and adjust the speed to suit.
- Getting the nozzle as close as possible to work to force as much of the air assist into the cut.
- Using the universal compound lens and nozzle to increase speed and reduce smoke.
- Adjusting Max/Min settings to improve corner cutting performance.
- Dot mode
- Laser Engraving Leather – chromate tanned leather
- Special mode for engraving
- Cleaning with soapy water.
My thanks go out to Tom at Thinklaser for giving permission to embed these videos on this site. If you are looking for a new laser machine from a quality supplier, then I would suggest you check out their website: www.thinklaser.com.
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Transcript for Cutting and Laser Engraving Leather and Hide
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Transcript for Cutting and Laser Engraving Leather and Hide
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[Music]
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welcome to another Lightblade Learning Lab
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um
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it’s not quite cold enough my breath to
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show at the moment but it’s quite cold
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in here
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it’s my little coat on today but hey we
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should soldier on for the purpose of
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science because today I’m going to be
What Next?
Did you enjoy this post? Why not check out some of our other posts:
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doing something I haven’t really played
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with before a long time ago I messed
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around with a little piece of there
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though one of these machines on my old
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machine and my only memories of that
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occasion were that it was very smelly
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and very difficult to keep the surface
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clean so today we’re going to look into
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some letters because basically there are
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two types of leather around we’ve got
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this sort here which is the sort you
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find on the sole of your shoe which is
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basically something called natural
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tanned hide that’s a process that’s been
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going on for thousands of years now a
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slightly more modern process which is
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used for these very thin leathers where
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they look to chamois on the back but
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you’ve got the skin texture on the front
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these are sort of things that you’d use
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for furnishings and car seats and things
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like that
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these are tanned by a process called
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chromate tanning but they haven’t got a
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leathery smell to be honest they don’t
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smell of anything
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whereas this hide naturally tanned hide
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smells exactly like you’d expect
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real leather to smell so we’ve got two
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problems first of all this stuff is very
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floppy and flexible what we’re going to
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
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do it apart from cutout car seats and
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sofas and leather cushions
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other things if you’re that way inclined
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I think we’ll start off with this stuff
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and we’ll see how it cuts now to play
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with this we’ve got some standard
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equipment here and some non-standard
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equipment when I say non-standard
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equipment I mean non-standard that’s
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supplied with the machine your machine
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would definitely have been supplied with
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a 2-inch lens now generally it’s applied
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with a church gallium arsenide lens
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because for cutting wood this is
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probably the best lens that I’ve found
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and then we’ve got a nozzle here with a
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very small hole in the end two and a
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half millimeter hole that is basically
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what I call a cutting nozzle because it
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focuses the air down to get it right
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into the cut itself and only sits maybe
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five or six millimeters away from the
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cutting surface now that’s fine for
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cutting where you want lots of air into
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your cut but when it comes to engraving
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the last thing you want is to blow lots
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of air at your engraved surface and so
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consequently I have designed something
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that I call a universal engraving nozzle
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it’s got a much larger hole in it it’s
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much shorter and it takes eighteen
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millimeter diameter lenses which are
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non-standard lenses for this machine
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because what it does you can put a lens
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in the bottom there and it sits the
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nozzle a long way off the surface so
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that you don’t put much air assists down
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onto the surface and you allow your a
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little exploding surface to go up in the
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air and stay in the air rather than get
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blown down and mark the surface of your
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work so we’ve got this which we shall be
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using later on and experimenting with
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this is acid’ it’s not a piece of
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standard kit that comes with the machine
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
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there is a chinese website they’re
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called cloud Raycom where you’ll be able
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to buy this Universal engraving nozzle
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so this is the same Universal nozzle but
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in this particular assembly I’ve got two
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lenses stacked together
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and this is what I call a compound lens
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and it is specifically for making very
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very small dots somewhere in the region
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of 0.1 or less so that we can do very
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fine quality picture engraving with this
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particular nozzle it also works as a
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cutting nozzle as well surprisingly
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enough so this is a moderately Universal
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this is specifically for if you want to
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for instance use a two inch lens or a
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two and a half inch lens for engraving
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and the sort of application you might
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have for that would be 3d engraving but
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these are – this particular nozzle is
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really a cutting nozzle so what happens
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if I want to do a job with cutting and
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engraving on it now you have a choice
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and you have to make some good
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engineering decisions if you’ve got lots
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of cutting and not much engraving I’d go
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for this nozzle if you’ve got lots of
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engraving and just a little bit of
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cutting around the outside I’d
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compromise and go for that nozzle but
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the requirements of engraving and the
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requirements of cutting are almost
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diametrically opposite and so you have
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to make some compromises somewhere well
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as we said we can start life trying to
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cut this material so I think I do will
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select a cutting nozzle and we’ll see
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how good this gallium arsenide is that
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cutting leather it was excellent a
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cutting wood so I know that to cut this
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I’m going to produce a large amount of
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smoke that goes underneath if I had the
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honeycomb table on the air would come
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through the front of the machine down
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through the table and out the back and
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
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it wouldn’t really be taking this smoke
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away the smoke would be sitting here
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hanging around inside the cabinet so
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what I want you to do today is to also
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while we’re cutting I want you to watch
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what happens to the smoke because we’ve
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got this table here and the air flow
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passing through the front we’ve got our
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cross flow are there as I’m so keen to
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keep telling you and that will go out
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the back of the machine at high rate of
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knots in a very control
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Manor it won’t get a chance to escape
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inside the machine here so when you open
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the lid you won’t fill the room with
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horrible smelly smoke now the last thing
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we really want to do is to cut this on a
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flat surface the only reason I put it
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there in the flat surfaces so you can
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see that paint we’ve got a bit of a
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problem look alright so we want to try
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and keep this flat
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always a difficult problem when you get
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things like that or prisoners of plywood
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which are bent so the way that I
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normally try and tackle this problem is
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where possible I can support my material
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off the bed with a magnet here and there
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and because these are neodymium magnets
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they are very very strong and I can just
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do this so we’ve got an only going to
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work on one door 25 millimeter test
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square at a time so I don’t need to
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support it too much just in a few places
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here and there so this is a two-inch
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lens and typically this would be around
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about seven millimeters I believe it’s
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distance right so we’re just going to
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now see if we can find the correct focal
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distance with my little dot test that I
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use
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[Music]
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
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I’ve recently purchased a new device off
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of ebay for absolutely half of nothing I
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think it is probably back to band or to
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pound 50 so Otto illuminates when you
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open it
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[Music]
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now it’s a little section of almost like
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burnt leather right round the outside of
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every hole or line which is the thing
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that’s causing the main color a shin
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here the center of the dot or the center
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of the mark is actually quite pleased
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and I would say that that is a pretty
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good focus because it’s not it’s a good
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clean set of lines and dots the dots a
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point to diameter they’re touching each
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other but that’s about as good as I can
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expect from a 2 inch lens we’re now
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going to do a 25 millimeter test square
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now what sort of speed and power should
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I run out well if I was doing this out
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of three or four millimeter plywood and
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it looks to be closer to 4 millimeters I
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would think I would probably be running
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it at about 20 millimeters a second with
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full power I think we might start this
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off at 15 millimetres a second and see
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what happens we’re either going too fast
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or too slow there is no right place to
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start
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now foes the door so that we can get
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proper air flow across the job and you
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can see what I mean about the smoke
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being generated and how it rips out the
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back of the machine
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now there’s smoke coming out of the top
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which is worrying
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but something you can see those we’ve
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got all this horrible smoke trail coming
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out the corners here where when it
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turned the corner it started blowing
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smoke at the back of the emotion and
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we’ve also got
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
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some coloration on here as well so as I
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said this is very similar to the
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memories that I had of it before it’s a
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difficult material to cut and the other
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thing I need to test which is what I do
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for plywood
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yeah it’s not exactly
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it’s not exactly clean on the edges is
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it so we’ve reduced the speed down to 13
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millimeters a second from 15 and we’ve
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reduced the power down so that the
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minimum is now 11% and the maximum is
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85% so hopefully it will slow down as it
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gets to these corners and produce
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slightly less so we’ve still got smoke
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coming up on top of the job and lots of
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it underneath as well it’s still got
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lots of muck on the edge normally we
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only get this debris on the start corner
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we’ve got all four corners here so this
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is a very unsatisfactory way I can’t see
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a way of getting rid of that smoke
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normally on wood it’s pretty easy to get
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rid of on lever it looks as though it’s
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00:11:13.97 –> 00:11:19.880
going to be a bit of a problem there is
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a fairly simple solution
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provided you’re only cutting
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we’ll turn the job over
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[Music]
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so there we are we can still see the
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burn marks on the corners although
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they’re not quite as bad because this
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material doesn’t hold on to the smoke as
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00:11:42.819 –> 00:11:48.009
easily as this lovely shiny surface on
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this side so now you see we’ve got
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00:11:48.009 –> 00:11:53.290
almost a smoke free cut as opposed to
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the first two at the bottom there as you
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can see here
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00:11:55.65 –> 00:12:01.500
we’re producing a lot of smoke that’s
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going downwards and condensing you know
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
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this is horrible
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00:12:02.7 –> 00:12:09.239
really horrible sticky stuff
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00:12:06.329 –> 00:12:12.350
this is worse than wood just take this
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00:12:09.239 –> 00:12:16.049
off while it’s nice and fresh and sticky
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00:12:12.35 –> 00:12:18.059
it comes off nice and easily so nothing
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has changed from my first experience of
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leather it’s difficult to keep clean
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when you’re cutting it
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now the last time I had this problem the
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solution was very simple masking tape or
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00:12:31.629 –> 00:12:38.059
there’s something called paper transfer
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tape which is used in the transfer of
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vinyl transfers onto things like vans or
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00:12:41.119 –> 00:12:46.660
shop windows don’t get the plastic one
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00:12:43.789 –> 00:12:49.690
get the paper version
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and that does just the same job and you
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can gather in wide reels
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fumes
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[Music]
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back down to where it was previously
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when the pieces fell oh so we’ve got 13
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millimeters a second 11 percent power
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for the coroners minimum and 85 percent
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power for the rest of the cat
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[Music]
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we could just check this piece out and
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that’s fairly clean on the back as we
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00:13:21.98 –> 00:13:25.730
would expect it to be provided it
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doesn’t drop and then of course on the
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00:13:25.73 –> 00:13:32.300
front here we can just peel off the tape
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and as expected it’s perfectly clean so
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00:13:32.3 –> 00:13:37.580
that’s a solution and that’s the only
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solution that I came across before to
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crafting this sort of leather mask it
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all
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now if we’re having this much trouble
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with leather cutting it what on earth is
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it going to do when we try and engrave
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it
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[Music]
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well that 115
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00:13:59.43 –> 00:14:04.960
[Music]
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
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00:14:01.66 –> 00:14:10.780
as you can see it looks pretty messy so
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00:14:04.96 –> 00:14:14.620
let’s take the speed up to 420
300
00:14:10.78 –> 00:14:18.690
so it’s hardly cutting through the tape
301
00:14:14.62 –> 00:14:18.690
at the moment I’m running so far
302
00:14:19.5 –> 00:14:23.850
so this is really a bit of a painful
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00:14:21.57 –> 00:14:26.460
exercise you can clean all these little
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00:14:23.85 –> 00:14:29.430
bits of tape out from the letters and if
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00:14:26.46 –> 00:14:31.020
you’ve got things like ours and B and
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00:14:29.43 –> 00:14:34.440
you’re gonna finish up possibly with
307
00:14:31.02 –> 00:14:37.620
sticky stuff I ask myself is there a
308
00:14:34.44 –> 00:14:39.990
better way of achieving this but I had
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00:14:37.62 –> 00:14:43.980
to show you that to show you the problem
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00:14:39.99 –> 00:14:46.620
that you have with engraving texts you
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still get all this brown stuff and in
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00:14:46.62 –> 00:14:52.680
fact it’s even worse because there is
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00:14:49.38 –> 00:14:56.340
nowhere for this stuff to go other than
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00:14:52.68 –> 00:14:59.310
upwards or sideways what happens is as
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00:14:56.34 –> 00:15:02.370
the laser hits the surface it produces
316
00:14:59.31 –> 00:15:04.800
like a little volcanic reaction it’s a
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00:15:02.37 –> 00:15:07.710
bit like dropping if you’d like a stone
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00:15:04.8 –> 00:15:10.410
into a soft pile of sand some of it will
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00:15:07.71 –> 00:15:12.870
go up a lot of it will go sideways and
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00:15:10.41 –> 00:15:16.290
that’s what you’re seeing here you’re
321
00:15:12.87 –> 00:15:19.350
seeing that same eruptive effect but now
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00:15:16.29 –> 00:15:23.190
I’ve made several significant changes
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00:15:19.35 –> 00:15:25.680
first of all we’ve put the engraving the
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universal engraving nozzle on here which
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00:15:25.68 –> 00:15:29.730
is not something you’re normally
326
00:15:27.03 –> 00:15:32.100
provided with it’s got a very very small
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00:15:29.73 –> 00:15:34.110
air pipe coming into here as you can see
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00:15:32.1 –> 00:15:37.350
we’ve put the full millimeter
329
00:15:34.11 –> 00:15:39.810
air pipe inside the six millimeter air
330
00:15:37.35 –> 00:15:41.880
pipe if I put my finger on the end here
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00:15:39.81 –> 00:15:44.280
you probably can hear
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00:15:41.88 –> 00:15:46.740
[Music]
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00:15:44.28 –> 00:15:48.440
the build-up of flow the pressure builds
334
00:15:46.74 –> 00:15:53.220
up behind my finger and you get a little
335
00:15:48.44 –> 00:15:54.840
but if I do it quickly there’s nothing
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00:15:53.22 –> 00:15:58.200
there at all there’s virtually nowhere
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00:15:54.84 –> 00:16:00.000
just enough to protect the lens okay now
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00:15:58.2 –> 00:16:02.730
in addition to that you’ll see that now
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00:16:00.0 –> 00:16:04.710
instead of a fan a six millimetre air
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
340
00:16:02.73 –> 00:16:06.660
gap that we’ve got here we’ve got
341
00:16:04.71 –> 00:16:09.030
probably something like about nineteen
342
00:16:06.66 –> 00:16:11.220
or twenty millimeters yeah it’s about
343
00:16:09.03 –> 00:16:14.010
nineteen millimeter air gap under there
344
00:16:11.22 –> 00:16:16.890
now that’s going to allow this volcanic
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00:16:14.01 –> 00:16:19.770
eruption that happens to come up in the
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00:16:16.89 –> 00:16:22.650
air even though this airflow here is
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00:16:19.77 –> 00:16:25.650
very small when it goes through that
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00:16:22.65 –> 00:16:28.530
very small nozzle there it still
349
00:16:25.65 –> 00:16:31.290
produces quite a significant stream of
350
00:16:28.53 –> 00:16:33.870
air which is blowing the fumes back down
351
00:16:31.29 –> 00:16:36.090
onto the work first of all we stop the
352
00:16:33.87 –> 00:16:39.120
air from blowing them back down by
353
00:16:36.09 –> 00:16:41.970
making it very very low velocity by
354
00:16:39.12 –> 00:16:44.250
reducing the power as much as we can so
355
00:16:41.97 –> 00:16:47.550
that we get much more of a an upward
356
00:16:44.25 –> 00:16:50.220
drift rather than an explosive sideways
357
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force the deeper we go the more
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00:16:50.22 –> 00:16:55.260
explosive and sideways we’re going to
359
00:16:53.01 –> 00:16:57.270
get our smoke and the final thing that
360
00:16:55.26 –> 00:16:59.790
I’m going to do as I’m going to change
361
00:16:57.27 –> 00:17:01.560
the start position you see it starting
362
00:16:59.79 –> 00:17:03.480
at the top and running down this time
363
00:17:01.56 –> 00:17:06.330
I’m going to start at the bottom and run
364
00:17:03.48 –> 00:17:08.820
towards the finish point this is exactly
365
00:17:06.33 –> 00:17:12.030
the same lens exactly the same speed
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00:17:08.82 –> 00:17:12.660
ie four hundred millimeters a second but
367
00:17:12.03 –> 00:17:14.670
the power
368
00:17:12.66 –> 00:17:18.090
Allura dropped the power to around about
369
00:17:14.67 –> 00:17:19.920
let’s try 20% I still got the scanning
370
00:17:18.09 –> 00:17:21.460
interval set at point one which is the
371
00:17:19.92 –> 00:17:25.130
same as I was using
372
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[Music]
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it’s not so dark but the other thing is
374
00:17:30.86 –> 00:17:33.490
if we look
375
00:17:38.21 –> 00:17:44.450
the debris in here is still capable of
376
00:17:42.049 –> 00:17:51.990
smudging onto the work
377
00:17:44.45 –> 00:17:55.910
[Music]
378
00:17:51.99 –> 00:17:55.910
look how much debris there is in there
379
00:17:56.38 –> 00:18:02.140
that’s not a very satisfactory way of
380
00:17:58.45 –> 00:18:04.480
Engraving either what other choice have
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
381
00:18:02.14 –> 00:18:07.200
we got okay I’m now gonna make another
382
00:18:04.48 –> 00:18:10.360
change I’m gonna remove this engraving
383
00:18:07.2 –> 00:18:13.480
nozzle these Universal engraving nozzle
384
00:18:10.36 –> 00:18:15.179
which has got a two inch lens in it and
385
00:18:13.48 –> 00:18:18.340
I’m going to replace it with another
386
00:18:15.179 –> 00:18:20.770
Universal engraving nozzle but this time
387
00:18:18.34 –> 00:18:25.299
it’s got a compound lens in which
388
00:18:20.77 –> 00:18:27.760
produces a very very small dot so I’m
389
00:18:25.299 –> 00:18:30.929
now in our D works and I have imported a
390
00:18:27.76 –> 00:18:34.419
piece of text this time as a bitmap
391
00:18:30.929 –> 00:18:37.000
because it’s a bitmap I’ve come in at
392
00:18:34.419 –> 00:18:39.669
about 150 pixels per inch
393
00:18:37.0 –> 00:18:43.240
quite a low resolution and we’ve got the
394
00:18:39.669 –> 00:18:46.480
line spacing set to about 0.15 I’ve got
395
00:18:43.24 –> 00:18:51.640
the power set to about 20% and the speed
396
00:18:46.48 –> 00:18:57.789
is still at 400 okay look we can see
397
00:18:51.64 –> 00:19:02.980
smoke not huge amount of it I’m not even
398
00:18:57.789 –> 00:19:06.130
running the extract system this time and
399
00:19:02.98 –> 00:19:09.270
that looks pretty good doesn’t it make
400
00:19:06.13 –> 00:19:09.270
sure we get a good imprint
401
00:19:10.73 –> 00:19:13.510
a look
402
00:19:13.73 –> 00:19:19.370
we’ve got virtually zero debris and it’s
403
00:19:17.779 –> 00:19:21.590
pretty flat
404
00:19:19.37 –> 00:19:24.260
there’s not much in the way of
405
00:19:21.59 –> 00:19:27.440
depression there and look I can rub it
406
00:19:24.26 –> 00:19:32.269
as much as I like and I can’t smear it
407
00:19:27.44 –> 00:19:36.320
we found a solution import a bitmap and
408
00:19:32.269 –> 00:19:39.350
run it lowish resolution 150 dots per
409
00:19:36.32 –> 00:19:41.990
inch we’ve got one more thing that we
410
00:19:39.35 –> 00:19:45.190
can do taken that piece of text which is
411
00:19:41.99 –> 00:19:48.110
a bitmap and I’ve actually divid it I
412
00:19:45.19 –> 00:19:52.820
have changed the picture resolution up
413
00:19:48.11 –> 00:19:56.330
to 254 pixels per inch which is a pixel
414
00:19:52.82 –> 00:19:59.659
size of 0.1 which is what I’m confident
415
00:19:56.33 –> 00:20:04.159
that this lens can do produce point 1
416
00:19:59.659 –> 00:20:07.600
dots so we’ve got dots at 254 pixels per
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
417
00:20:04.159 –> 00:20:12.110
inch and a scanline interval of 0.1 I
418
00:20:07.6 –> 00:20:15.580
dropped the power even further to 15%
419
00:20:12.11 –> 00:20:18.940
and I’m still keeping the speed at 400
420
00:20:15.58 –> 00:20:18.940
watt smoke
421
00:20:20.47 –> 00:20:28.390
I can see hardly anything at all and of
422
00:20:25.57 –> 00:20:32.110
course no smoke means I’m not going to
423
00:20:28.39 –> 00:20:34.720
produce any damage to my work there is a
424
00:20:32.11 –> 00:20:37.539
very small amount of smoke drifting
425
00:20:34.72 –> 00:20:39.070
around which if I had the fan on would
426
00:20:37.539 –> 00:20:41.710
have sucked away instantly and you
427
00:20:39.07 –> 00:20:46.590
wouldn’t have seen anything at all now
428
00:20:41.71 –> 00:20:46.590
somewhere on there was our first test
429
00:20:46.8 –> 00:20:52.350
[Music]
430
00:20:53.21 –> 00:20:58.480
and some were on there is our second
431
00:20:56.24 –> 00:20:58.480
test
432
00:20:58.98 –> 00:21:05.790
now there’s virtually no difference
433
00:21:01.53 –> 00:21:09.560
between those at all this is virtually
434
00:21:05.79 –> 00:21:13.680
smooth this is not bad either
435
00:21:09.56 –> 00:21:16.050
so either of those are really nice clean
436
00:21:13.68 –> 00:21:18.870
pieces of engraving so the technique is
437
00:21:16.05 –> 00:21:21.660
to use a bitmap and not a vector file
438
00:21:18.87 –> 00:21:25.590
for your engraving on leather will run
439
00:21:21.66 –> 00:21:27.630
the same file with a two inch lens so
440
00:21:25.59 –> 00:21:29.340
that we can compare the difference no
441
00:21:27.63 –> 00:21:31.650
change in parameters we’re still running
442
00:21:29.34 –> 00:21:34.650
with a point one this lens is capable of
443
00:21:31.65 –> 00:21:37.770
doing point two dots not point one dots
444
00:21:34.65 –> 00:21:40.140
so we should actually get probably a bit
445
00:21:37.77 –> 00:21:43.140
of a burn effect on this one and maybe
446
00:21:40.14 –> 00:21:46.910
produce more smoke than we need to sure
447
00:21:43.14 –> 00:21:46.910
enough we are producing more smoke
448
00:21:59.37 –> 00:22:04.910
[Music]
449
00:22:00.79 –> 00:22:07.000
but that’s not bad at all is it let’s
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
450
00:22:04.91 –> 00:22:10.280
just see what debris we can pull off
451
00:22:07.0 –> 00:22:12.710
nothing there at all really we could try
452
00:22:10.28 –> 00:22:15.110
that same thing at 127 dots per each
453
00:22:12.71 –> 00:22:26.510
which is the correct resolution for that
454
00:22:15.11 –> 00:22:30.820
lens well again we can see the dots this
455
00:22:26.51 –> 00:22:30.820
time just
456
00:22:31.63 –> 00:22:41.110
that’s not a problem at all so I would
457
00:22:37.12 –> 00:22:44.799
say a 2-inch lens with a 256 dot per
458
00:22:41.11 –> 00:22:49.390
inch gives a good result crisp clear
459
00:22:44.799 –> 00:22:51.580
dark without any depth to it really
460
00:22:49.39 –> 00:22:53.260
there’s just the merest hint of depth to
461
00:22:51.58 –> 00:22:56.110
it well I suppose we’ve got one more
462
00:22:53.26 –> 00:23:00.730
test to do to take us around in a full
463
00:22:56.11 –> 00:23:03.220
circle and that is we put the we put the
464
00:23:00.73 –> 00:23:05.409
cutting nozzle back on with the two inch
465
00:23:03.22 –> 00:23:11.049
lens and we’re going to dinner
466
00:23:05.409 –> 00:23:14.500
at 256 dots per each and we’re going to
467
00:23:11.049 –> 00:23:16.980
run at 15% power and 400 millimetres a
468
00:23:14.5 –> 00:23:16.980
second
469
00:23:24.879 –> 00:23:31.600
okay so that was a bit of a mistake
470
00:23:27.289 –> 00:23:31.600
because I had air assist on
471
00:23:40.97 –> 00:23:47.429
well from a distance it doesn’t look too
472
00:23:43.35 –> 00:23:50.539
bad when you get a bit closer there is
473
00:23:47.429 –> 00:23:50.539
some browning on there
474
00:23:53.75 –> 00:23:58.640
some smoke damage
475
00:23:55.59 –> 00:24:00.500
[Music]
476
00:23:58.64 –> 00:24:03.290
and there we go you can see the smoke
477
00:24:00.5 –> 00:24:07.220
damage on there now so I’m afraid that
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
478
00:24:03.29 –> 00:24:10.520
the standard nozzle is definitely not as
479
00:24:07.22 –> 00:24:12.530
good as the universal engraving nozzle
480
00:24:10.52 –> 00:24:16.760
the universal engraving nozzle seems to
481
00:24:12.53 –> 00:24:20.360
do a good job whatever we do with it but
482
00:24:16.76 –> 00:24:22.130
the standard nozzle mm it does a
483
00:24:20.36 –> 00:24:24.730
reasonable job but it isn’t anywhere
484
00:24:22.13 –> 00:24:27.140
near it’s probably 90% as good as these
485
00:24:24.73 –> 00:24:28.760
even though we’ve got a very very small
486
00:24:27.14 –> 00:24:31.250
amount of air passing through that
487
00:24:28.76 –> 00:24:31.880
nozzle because it is focused down into a
488
00:24:31.25 –> 00:24:34.070
jet
489
00:24:31.88 –> 00:24:35.570
it still disrupts the little eruptions
490
00:24:34.07 –> 00:24:36.830
that are taking place on the surface
491
00:24:35.57 –> 00:24:39.470
there is spreading them out and
492
00:24:36.83 –> 00:24:41.559
condensing them around the product okay
493
00:24:39.47 –> 00:24:44.600
so we found out that we can produce
494
00:24:41.559 –> 00:24:47.929
smokeless engraving on the surface of
495
00:24:44.6 –> 00:24:50.179
this hide now to do that what we’ve
496
00:24:47.929 –> 00:24:52.880
found was that we can do it with the
497
00:24:50.179 –> 00:24:55.040
smallest possible dots and the minimum
498
00:24:52.88 –> 00:24:57.169
amount of damage to the surface we just
499
00:24:55.04 –> 00:24:59.990
produce a little teeny-weeny spike of
500
00:24:57.169 –> 00:25:01.820
smoke that blows away quickly we can
501
00:24:59.99 –> 00:25:04.250
still damage the surface and put a nice
502
00:25:01.82 –> 00:25:06.470
mark on there but we’re not going to do
503
00:25:04.25 –> 00:25:09.290
a huge amount of damage to the surface
504
00:25:06.47 –> 00:25:12.590
and that’s the secret if you want to
505
00:25:09.29 –> 00:25:14.929
engrave pictures on your leather be they
506
00:25:12.59 –> 00:25:17.179
photographs or images of some sort
507
00:25:14.929 –> 00:25:19.730
something more than text then obviously
508
00:25:17.179 –> 00:25:21.650
we can’t use tape or anything on the
509
00:25:19.73 –> 00:25:22.460
surface because you just won’t be able
510
00:25:21.65 –> 00:25:24.380
to get it off
511
00:25:22.46 –> 00:25:28.280
so we’ve got to be able to do it in a
512
00:25:24.38 –> 00:25:32.450
smokeless manner and to do that we must
513
00:25:28.28 –> 00:25:34.460
use the compound engraving lens because
514
00:25:32.45 –> 00:25:36.890
we found that if we use the 2 inch lens
515
00:25:34.46 –> 00:25:39.320
yeah we’ve got some success even though
516
00:25:36.89 –> 00:25:40.970
we’re not using much air when we peel
517
00:25:39.32 –> 00:25:42.950
off and test the surface
518
00:25:40.97 –> 00:25:45.230
we’ve still got debris sitting on the
519
00:25:42.95 –> 00:25:47.570
surface now when we’re using the
520
00:25:45.23 –> 00:25:50.240
compound engraving lens we’re going to
521
00:25:47.57 –> 00:25:52.970
be putting down a series of dots both in
522
00:25:50.24 –> 00:25:55.460
the backwards and forwards direction now
523
00:25:52.97 –> 00:25:58.040
for our dots to make any sense at all
524
00:25:55.46 –> 00:26:00.919
they’ve basically got to line up with
525
00:25:58.04 –> 00:26:04.429
each other now if I going to Rd works to
526
00:26:00.919 –> 00:26:06.950
the configure system settings what I
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
527
00:26:04.429 –> 00:26:08.440
should find here is I’ve got something
528
00:26:06.95 –> 00:26:12.080
called scanning
529
00:26:08.44 –> 00:26:13.970
reverse compensation when it comes to
530
00:26:12.08 –> 00:26:19.519
dot engraving there are certain speeds
531
00:26:13.97 –> 00:26:24.080
that you really need to use hundred 150
532
00:26:19.519 –> 00:26:26.990
maybe 200 tops but on average if you run
533
00:26:24.08 –> 00:26:29.240
at 150 millimeters a second you’ll get
534
00:26:26.99 –> 00:26:32.809
pretty good results with the compound
535
00:26:29.24 –> 00:26:34.340
engraving lens but to get those results
536
00:26:32.809 –> 00:26:37.399
you’ve got to make sure that your
537
00:26:34.34 –> 00:26:40.039
scanning is uniform in both directions
538
00:26:37.399 –> 00:26:43.299
now what I’m going to do here is I’m
539
00:26:40.039 –> 00:26:45.350
going to turn off the scanning offset
540
00:26:43.299 –> 00:26:46.909
compensation which is built into the
541
00:26:45.35 –> 00:26:49.009
machine now I’ve dealt with this in a
542
00:26:46.909 –> 00:26:51.169
separate program but we’ll just go
543
00:26:49.009 –> 00:26:54.519
through it very quickly again to show
544
00:26:51.169 –> 00:26:58.220
you the problem now to see this effect
545
00:26:54.519 –> 00:27:01.610
all you need to do is to draw a very
546
00:26:58.22 –> 00:27:01.999
simple rectangle or a square it doesn’t
547
00:27:01.61 –> 00:27:04.940
matter
548
00:27:01.999 –> 00:27:09.350
we’ll make it 15 millimeters wide and
549
00:27:04.94 –> 00:27:13.179
about 20 millimeters tall and we’ve got
550
00:27:09.35 –> 00:27:14.799
to set it to scan as opposed to cut
551
00:27:13.179 –> 00:27:19.629
and we’re going to set the speed
552
00:27:14.799 –> 00:27:22.299
initially to 400 now I’m going to set it
553
00:27:19.629 –> 00:27:25.629
to 400 because that shows you and
554
00:27:22.299 –> 00:27:27.219
exaggerate the problem even though we’re
555
00:27:25.629 –> 00:27:30.729
not going to use 400 at the moment I’m
556
00:27:27.219 –> 00:27:33.339
going to show you and power 20% should
557
00:27:30.729 –> 00:27:38.669
be good enough now we’re going to set
558
00:27:33.339 –> 00:27:42.940
the interval to not 0.5 millimeters 0.5
559
00:27:38.669 –> 00:27:46.080
enter we’re going to have x-wing and
560
00:27:42.94 –> 00:28:00.279
we’re gonna have no ticks up here at all
561
00:27:46.08 –> 00:28:05.909
okay now here’s our problem as you can
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
562
00:28:00.279 –> 00:28:05.909
see when we scan in one direction
563
00:28:06.68 –> 00:28:15.140
the beam takes a few microseconds to
564
00:28:10.76 –> 00:28:17.450
start off the beam finishes in the right
565
00:28:15.14 –> 00:28:18.950
place but then when it steps down to the
566
00:28:17.45 –> 00:28:21.559
next line there’s a little bit of a
567
00:28:18.95 –> 00:28:23.930
delay in its starting so you can see
568
00:28:21.559 –> 00:28:27.020
there’s a scanning difference between
569
00:28:23.93 –> 00:28:30.500
these two directions and what that means
570
00:28:27.02 –> 00:28:32.630
is if I’ve got a series of dots that I
571
00:28:30.5 –> 00:28:35.450
want to line up with very accurately to
572
00:28:32.63 –> 00:28:37.850
produce a nice picture I’m not going to
573
00:28:35.45 –> 00:28:41.390
get it unless I make all these lines
574
00:28:37.85 –> 00:28:43.400
start and finish at the same point my
575
00:28:41.39 –> 00:28:45.260
dots are going to be out of sync and I’m
576
00:28:43.4 –> 00:28:47.120
gonna get a bit of a fuzzy picture I’m
577
00:28:45.26 –> 00:28:52.040
never going to get a crisp clean
578
00:28:47.12 –> 00:28:57.650
detailed picture so to fix this problem
579
00:28:52.04 –> 00:28:59.480
we need to use the scanning offset okay
580
00:28:57.65 –> 00:29:02.059
now I’m going to do another test and I’m
581
00:28:59.48 –> 00:29:05.630
going to put the scanning offset on for
582
00:29:02.059 –> 00:29:08.090
for mint 400 millimeters a second now a
583
00:29:05.63 –> 00:29:11.179
few sessions ago I did cover the whole
584
00:29:08.09 –> 00:29:13.130
of this subject in detail and you’ll see
585
00:29:11.179 –> 00:29:16.190
that I’ve got the compensation in here
586
00:29:13.13 –> 00:29:19.010
of not 0.1 millimeters for 400
587
00:29:16.19 –> 00:29:22.580
millimeters a second so let’s leave it
588
00:29:19.01 –> 00:29:24.980
at that close this is the same test with
589
00:29:22.58 –> 00:29:27.650
the compensation in and now I hope you
590
00:29:24.98 –> 00:29:32.050
can see the difference down here we’ve
591
00:29:27.65 –> 00:29:34.180
got virtually all of the lines lined up
592
00:29:32.05 –> 00:29:37.000
okay and so what we’ve done we’ve fixed
593
00:29:34.18 –> 00:29:39.400
this offset with a little bit of special
594
00:29:37.0 –> 00:29:42.760
compensation they’re never going to be
595
00:29:39.4 –> 00:29:45.910
absolutely perfect down here for high
596
00:29:42.76 –> 00:29:49.780
speeds but as you reduce the speed of
597
00:29:45.91 –> 00:29:53.320
scanning this effect here becomes less
598
00:29:49.78 –> 00:29:56.530
and you can get this a lot more accurate
599
00:29:53.32 –> 00:29:58.870
so again another reason for using a
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
600
00:29:56.53 –> 00:30:01.240
fairly low speed so that we get very
601
00:29:58.87 –> 00:30:07.870
accurate positioning of our dots in both
602
00:30:01.24 –> 00:30:10.330
the left and right directions now that
603
00:30:07.87 –> 00:30:13.270
might have looked quite fast to you but
604
00:30:10.33 –> 00:30:15.250
in reality that’s 150 millimeters a
605
00:30:13.27 –> 00:30:17.530
second and you can see the difference
606
00:30:15.25 –> 00:30:19.840
because we’ve slowed the speed down
607
00:30:17.53 –> 00:30:23.620
we’ve got darker lines and so here’s our
608
00:30:19.84 –> 00:30:26.500
scanning offset at 150 millimeters a
609
00:30:23.62 –> 00:30:29.430
second now the scanning offset on this
610
00:30:26.5 –> 00:30:32.770
machine has been set to point zero five
611
00:30:29.43 –> 00:30:35.610
but your machine will undoubtedly be
612
00:30:32.77 –> 00:30:38.500
different so you cannot use my numbers
613
00:30:35.61 –> 00:30:42.010
you have to find your numbers out by
614
00:30:38.5 –> 00:30:45.100
using this very simple ladder test so
615
00:30:42.01 –> 00:30:47.980
we’re now ready to try some detailed
616
00:30:45.1 –> 00:30:50.260
engraving with this machine okay now as
617
00:30:47.98 –> 00:30:53.020
we saw earlier there’s no such thing as
618
00:30:50.26 –> 00:30:55.060
a piece of flat leather so we have to be
619
00:30:53.02 –> 00:30:58.120
rather inventive about how we try and
620
00:30:55.06 –> 00:31:00.220
hold this flat I put the magnets in the
621
00:30:58.12 –> 00:31:02.920
middle here as well so that I’ve got a
622
00:31:00.22 –> 00:31:06.550
level surface so I’m gonna force this
623
00:31:02.92 –> 00:31:09.790
into a slight curve like this so that
624
00:31:06.55 –> 00:31:13.660
when I place it on top of these the
625
00:31:09.79 –> 00:31:16.630
middle is sitting level and then I’m
626
00:31:13.66 –> 00:31:21.810
going to put the magnets on top
627
00:31:16.63 –> 00:31:21.810
and hopefully the magnets will pull
628
00:31:21.99 –> 00:31:28.270
where I want to engrave which is in this
629
00:31:24.7 –> 00:31:29.800
area here it will be flat now I can’t
630
00:31:28.27 –> 00:31:31.930
guarantee that it’s going to be level
631
00:31:29.8 –> 00:31:33.760
around the edges as you can see I could
632
00:31:31.93 –> 00:31:35.290
put some more support magnets around the
633
00:31:33.76 –> 00:31:37.540
edge and I think they’ve got a
634
00:31:35.29 –> 00:31:40.150
reasonably flat surface in there for
635
00:31:37.54 –> 00:31:41.470
doing our work on so obviously you’re
636
00:31:40.15 –> 00:31:44.980
not going to be able to do this on your
637
00:31:41.47 –> 00:31:48.070
handbag or your shoes but this is a
638
00:31:44.98 –> 00:31:50.710
demonstration you’ve got to be inventive
639
00:31:48.07 –> 00:31:53.080
about how you how you use this
640
00:31:50.71 –> 00:31:56.500
particular procedure we’re going to be
641
00:31:53.08 –> 00:31:59.460
using the same speed 150 that we
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
642
00:31:56.5 –> 00:32:04.240
selected for our offset compensation
643
00:31:59.46 –> 00:32:06.850
because if we use 149 or 151 millimeters
644
00:32:04.24 –> 00:32:10.120
a second the compensation will not be
645
00:32:06.85 –> 00:32:11.860
taken into account the only speed of
646
00:32:10.12 –> 00:32:13.990
where this compensation will take place
647
00:32:11.86 –> 00:32:16.720
is the ones that you put in your table
648
00:32:13.99 –> 00:32:19.210
it’s a lookup table it’s not a graphical
649
00:32:16.72 –> 00:32:21.040
interpretation well here’s the image
650
00:32:19.21 –> 00:32:22.690
that we’re going to try and put onto the
651
00:32:21.04 –> 00:32:26.530
leather if I look at the size of this
652
00:32:22.69 –> 00:32:30.130
it’s actually about 150 millimeters
653
00:32:26.53 –> 00:32:34.810
square roughly so I need to change this
654
00:32:30.13 –> 00:32:36.970
to 90 millimeters square ish so that it
655
00:32:34.81 –> 00:32:39.130
fits on our material I can now go and
656
00:32:36.97 –> 00:32:41.620
look in the bitmap handle and what would
657
00:32:39.13 –> 00:32:44.590
you find is that we’ve got a resolution
658
00:32:41.62 –> 00:32:46.540
of 250 pixels per inch which is great
659
00:32:44.59 –> 00:32:50.680
because that’s nearly what we want we’ve
660
00:32:46.54 –> 00:32:54.310
got a point we want to use 254 so I’m
661
00:32:50.68 –> 00:32:56.940
going to set the output to 254 because
662
00:32:54.31 –> 00:32:59.770
that happens to be a point 1 pixel size
663
00:32:56.94 –> 00:33:01.030
but before we did it with a dot graphic
664
00:32:59.77 –> 00:33:04.720
what I’m going to do is look at that
665
00:33:01.03 –> 00:33:06.520
picture and say hmmm I think probably I
666
00:33:04.72 –> 00:33:09.790
could do with enhancing it a little bit
667
00:33:06.52 –> 00:33:11.230
as far as contrast is concerned so I’m
668
00:33:09.79 –> 00:33:13.720
gonna play with the contrast a little
669
00:33:11.23 –> 00:33:14.610
bit and we just apply it to see what
670
00:33:13.72 –> 00:33:17.110
happens
671
00:33:14.61 –> 00:33:19.060
we’ve just brightened the picture up a
672
00:33:17.11 –> 00:33:21.100
little bit and improve the contrast in
673
00:33:19.06 –> 00:33:23.140
these areas just up here this is where a
674
00:33:21.1 –> 00:33:25.480
certain amount of skill and practice
675
00:33:23.14 –> 00:33:26.950
comes in so I’m going to now select dot
676
00:33:25.48 –> 00:33:29.830
graphic and we’re going to convert that
677
00:33:26.95 –> 00:33:32.620
into a binary dot picture and
678
00:33:29.83 –> 00:33:34.960
is that just a series of dots we’re
679
00:33:32.62 –> 00:33:38.559
gonna apply that to the main view which
680
00:33:34.96 –> 00:33:40.929
is here and again there it is we’re
681
00:33:38.559 –> 00:33:42.490
going to set the speed to 150 we’re not
682
00:33:40.929 –> 00:33:44.350
going to have any air blowing down on
683
00:33:42.49 –> 00:33:46.630
the job except that’s that that which is
684
00:33:44.35 –> 00:33:49.870
protecting the lens we’ve got to set the
685
00:33:46.63 –> 00:33:51.610
power and the focus for this machine we
686
00:33:49.87 –> 00:33:53.380
know that we want to run at 150
687
00:33:51.61 –> 00:33:55.899
millimeters a second we’re going to have
688
00:33:53.38 –> 00:33:58.480
X swing and we can have nothing in these
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
689
00:33:55.899 –> 00:34:01.539
tick boxes up here the only thing we’re
690
00:33:58.48 –> 00:34:03.279
left to play with now is this power so
691
00:34:01.539 –> 00:34:05.950
it’s a-ok for the moment and then we’ll
692
00:34:03.279 –> 00:34:08.290
go and set the focus up now although we
693
00:34:05.95 –> 00:34:10.060
normally are used to seeing this focus
694
00:34:08.29 –> 00:34:12.129
gauge here which is half millimeter
695
00:34:10.06 –> 00:34:14.770
steps when I’m using this compound Linn
696
00:34:12.129 –> 00:34:16.990
sort of much finer resolution measuring
697
00:34:14.77 –> 00:34:20.290
gauge that runs from ten millimeters to
698
00:34:16.99 –> 00:34:22.030
12 millimeters and nominally the focus
699
00:34:20.29 –> 00:34:24.970
for this lens is somewhere around about
700
00:34:22.03 –> 00:34:27.419
ten point five to eleven ten point seven
701
00:34:24.97 –> 00:34:27.419
maybe
702
00:34:28.53 –> 00:34:32.850
now I’m going to use my little
703
00:34:31.129 –> 00:34:37.500
focus-test
704
00:34:32.85 –> 00:34:39.300
patent that tells me two things it tells
705
00:34:37.5 –> 00:34:43.850
me the focus and whether I’ve not I’ve
706
00:34:39.3 –> 00:34:43.850
got my dots at point one diameter
707
00:34:45.98 –> 00:34:51.570
well it’s definitely nice and dark
708
00:34:49.28 –> 00:34:54.300
question is what do the dots look like
709
00:34:51.57 –> 00:34:56.010
yeah it’s nice and dark but I can’t see
710
00:34:54.3 –> 00:34:58.530
any single dots the dots are merged
711
00:34:56.01 –> 00:35:04.680
together they’re roughly point to those
712
00:34:58.53 –> 00:35:07.260
dots at the moment yep we’re going with
713
00:35:04.68 –> 00:35:09.180
11 millimeters now I have noticed that
714
00:35:07.26 –> 00:35:11.100
as you changed the material you
715
00:35:09.18 –> 00:35:14.090
sometimes need to change the focal point
716
00:35:11.1 –> 00:35:16.320
by maybe as much as half a millimeter so
717
00:35:14.09 –> 00:35:18.750
sometimes it works at ten point five
718
00:35:16.32 –> 00:35:21.180
sometimes it works at anything up to
719
00:35:18.75 –> 00:35:23.160
eleven or eleven point two in this
720
00:35:21.18 –> 00:35:24.750
instance we’ve got 11 millimeter so now
721
00:35:23.16 –> 00:35:27.630
we’ve got to go back to our picture and
722
00:35:24.75 –> 00:35:29.550
match the picture parameters to the same
723
00:35:27.63 –> 00:35:33.480
as those that we used for our test which
724
00:35:29.55 –> 00:35:36.870
is 15% power and 150 millimeters a
725
00:35:33.48 –> 00:35:38.730
second now I’m going to close the lid so
726
00:35:36.87 –> 00:35:41.829
that we get area flow across the job
727
00:35:38.73 –> 00:35:41.829
[Music]
728
00:35:42.68 –> 00:35:48.250
now something I’ve said many times
729
00:35:44.42 –> 00:35:53.210
before is if you’ve got a very powerful
730
00:35:48.25 –> 00:35:55.640
200 100 watts 150 watts there’s not a
731
00:35:53.21 –> 00:35:58.700
great deal of chance that you’ll be able
732
00:35:55.64 –> 00:36:01.819
to do things as delicate as this you
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
733
00:35:58.7 –> 00:36:04.240
need a low-power tube in the 40 to 60
734
00:36:01.819 –> 00:36:07.220
maybe you might get away with 80 watts
735
00:36:04.24 –> 00:36:07.760
running at low power to get this sort of
736
00:36:07.22 –> 00:36:09.920
fine
737
00:36:07.76 –> 00:36:11.569
resolution photo engraving or picture
738
00:36:09.92 –> 00:36:14.750
engraving now you probably look at that
739
00:36:11.569 –> 00:36:15.520
and say that’s pretty good – my critical
740
00:36:14.75 –> 00:36:19.250
eye
741
00:36:15.52 –> 00:36:21.230
it’s far too dark I’ve got too much
742
00:36:19.25 –> 00:36:24.770
power in there I think I’ll reduce the
743
00:36:21.23 –> 00:36:29.349
power from 15 percent and I’ll drop it
744
00:36:24.77 –> 00:36:29.349
right down for about probably 12 percent
745
00:36:35.75 –> 00:36:40.609
now you can see the difference between
746
00:36:37.369 –> 00:36:46.300
the two this one you can see the detail
747
00:36:40.609 –> 00:36:48.310
here and it’s totally over burnt there
748
00:36:46.3 –> 00:36:52.360
so you’ve got to get the balance of
749
00:36:48.31 –> 00:36:55.570
power right as well there’s no three
750
00:36:52.36 –> 00:36:59.570
deenis in this at all there is no
751
00:36:55.57 –> 00:37:01.250
burning or browning on the surface
752
00:36:59.57 –> 00:37:03.740
and there we go when I do my sticky
753
00:37:01.25 –> 00:37:06.350
paper test on both of those that will
754
00:37:03.74 –> 00:37:09.260
show you how much debris is coming out
755
00:37:06.35 –> 00:37:12.010
of this second picture virtually none
756
00:37:09.26 –> 00:37:14.960
the first one was well and truly
757
00:37:12.01 –> 00:37:17.340
overburn okay let’s just have a quick
758
00:37:14.96 –> 00:37:23.419
look around that picture
759
00:37:17.34 –> 00:37:23.419
[Music]
760
00:37:25.17 –> 00:37:28.310
some of the detail
761
00:37:29.86 –> 00:37:36.190
[Music]
762
00:37:36.4 –> 00:37:41.530
now right up close you can see that it’s
763
00:37:39.19 –> 00:37:44.770
made up of dots
764
00:37:41.53 –> 00:37:47.910
or are they the holes in the hide where
765
00:37:44.77 –> 00:37:50.470
the hairs went nobody will ever know
766
00:37:47.91 –> 00:37:52.360
except you and I because as soon as you
767
00:37:50.47 –> 00:37:53.230
start zooming out the standing this at
768
00:37:52.36 –> 00:37:56.480
arm’s length
769
00:37:53.23 –> 00:37:59.530
it looks pretty phenomenal
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
770
00:37:56.48 –> 00:38:02.540
that’s what you can do with hide and a
771
00:37:59.53 –> 00:38:06.500
compound lens which is taken of getting
772
00:38:02.54 –> 00:38:12.290
your 0.1 dot you can convert your 254
773
00:38:06.5 –> 00:38:14.180
PPI pictures need to 254 DPI pictures as
774
00:38:12.29 –> 00:38:16.339
you can see there since I lasted this
775
00:38:14.18 –> 00:38:18.589
video you’ll notice that I’ve got a
776
00:38:16.339 –> 00:38:21.740
rather strange voice I’ve developed a
777
00:38:18.589 –> 00:38:26.890
very heavy cold but that doesn’t stop me
778
00:38:21.74 –> 00:38:26.890
working I’m a bloke and I just carry on
779
00:38:28.03 –> 00:38:32.710
now what we’ve got here is something
780
00:38:30.58 –> 00:38:35.230
completely different than the thick hide
781
00:38:32.71 –> 00:38:37.540
here we’ve got the chromate tanned
782
00:38:35.23 –> 00:38:39.910
leather which is a soft leather the sort
783
00:38:37.54 –> 00:38:44.260
of things I might use to make some new
784
00:38:39.91 –> 00:38:46.090
seats for my Ferrari for example or if I
785
00:38:44.26 –> 00:38:48.250
was that way inclined maybe my new
786
00:38:46.09 –> 00:38:50.650
handbag now this is a completely
787
00:38:48.25 –> 00:38:53.650
different problem because first of all
788
00:38:50.65 –> 00:38:55.600
it’s floppy and much as I hate using the
789
00:38:53.65 –> 00:38:57.700
bars or the honeycomb table I’m afraid
790
00:38:55.6 –> 00:38:59.280
that’s the only way that we’re going to
791
00:38:57.7 –> 00:39:01.810
be able to do with this particular
792
00:38:59.28 –> 00:39:04.090
material we are going to finish up with
793
00:39:01.81 –> 00:39:06.370
a few marks on the back and there are
794
00:39:04.09 –> 00:39:08.770
ways that I could design things too like
795
00:39:06.37 –> 00:39:11.290
a little a version of this for example
796
00:39:08.77 –> 00:39:14.560
which sits on top of my solid table
797
00:39:11.29 –> 00:39:17.650
which would be a series of acrylic bars
798
00:39:14.56 –> 00:39:19.750
and acrylic when it cuts would not mark
799
00:39:17.65 –> 00:39:21.040
the back of the product but I’m not
800
00:39:19.75 –> 00:39:22.570
going to go to the trouble of that at
801
00:39:21.04 –> 00:39:24.460
the moment but if you were actually
802
00:39:22.57 –> 00:39:26.650
doing this sort of work then you might
803
00:39:24.46 –> 00:39:28.300
want to think about making a special jig
804
00:39:26.65 –> 00:39:30.340
to hold the material so that it doesn’t
805
00:39:28.3 –> 00:39:32.380
mark on the back so I would think about
806
00:39:30.34 –> 00:39:33.850
using the two inch standard lens the
807
00:39:32.38 –> 00:39:35.590
shortest focal length lens that you’ve
808
00:39:33.85 –> 00:39:37.810
been supplied with your machine now the
809
00:39:35.59 –> 00:39:39.040
nozzle is obviously a standard nozzle
810
00:39:37.81 –> 00:39:41.230
that you’ve got which has got a two and
811
00:39:39.04 –> 00:39:43.450
a half millimeter hole in the end now
812
00:39:41.23 –> 00:39:44.950
that’s quite a large hole I’ll
813
00:39:43.45 –> 00:39:47.350
demonstrate what we’ll get with this two
814
00:39:44.95 –> 00:39:49.870
and a half millimeter hole now I’m going
815
00:39:47.35 –> 00:39:52.240
to set up a little test square in here
816
00:39:49.87 –> 00:39:54.240
which is 25 millimeters square we’re
817
00:39:52.24 –> 00:39:58.720
going to test a few speeds and powers
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
818
00:39:54.24 –> 00:40:01.960
wrong we’re going to test speeds because
819
00:39:58.72 –> 00:40:04.540
I always start off with maximum power
820
00:40:01.96 –> 00:40:06.610
when of cutting organic materials don’t
821
00:40:04.54 –> 00:40:08.950
fiddle around with lower powers just go
822
00:40:06.61 –> 00:40:10.390
straight for the throat and go with the
823
00:40:08.95 –> 00:40:14.710
maximum power that your machine will
824
00:40:10.39 –> 00:40:16.600
output at the safe current so we go for
825
00:40:14.71 –> 00:40:18.880
maximum setting on this machine which I
826
00:40:16.6 –> 00:40:23.110
believe is 78 percent which should give
827
00:40:18.88 –> 00:40:24.100
me 22 milliamps and speed well that’s
828
00:40:23.11 –> 00:40:25.840
the only thing that we’re going to play
829
00:40:24.1 –> 00:40:28.590
with and we need to try and find them
830
00:40:25.84 –> 00:40:31.750
very very fastest speed that we can
831
00:40:28.59 –> 00:40:34.720
anything slow will cause charring on the
832
00:40:31.75 –> 00:40:36.700
edges the faster we go the better the
833
00:40:34.72 –> 00:40:38.940
edge condition will be so I’m going to
834
00:40:36.7 –> 00:40:42.539
start off at about say 25mm
835
00:40:38.94 –> 00:40:45.770
there’s a second nine eight seven there
836
00:40:42.539 –> 00:40:45.770
we go seven millimeters
837
00:40:50.53 –> 00:40:55.190
pretty messy on the surface but we’ve
838
00:40:53.06 –> 00:40:59.140
got brain debris on the surface there
839
00:40:55.19 –> 00:41:00.520
and it doesn’t rub off easily oh we got
840
00:40:59.14 –> 00:41:03.770
[Music]
841
00:41:00.52 –> 00:41:06.349
childish ideas they’re not playing
842
00:41:03.77 –> 00:41:08.299
they’re definitely black
843
00:41:06.349 –> 00:41:10.130
and the real test of what the age is
844
00:41:08.299 –> 00:41:10.780
like is if you get a piece of white
845
00:41:10.13 –> 00:41:13.810
tissue
846
00:41:10.78 –> 00:41:16.740
[Music]
847
00:41:13.81 –> 00:41:16.740
and there we go
848
00:41:17.29 –> 00:41:23.280
there’s definitely some charring on the
849
00:41:19.27 –> 00:41:23.280
edge let’s go silly i’ma go certified
850
00:41:23.48 –> 00:41:29.690
that works and I think immediately you
851
00:41:26.6 –> 00:41:32.720
could say on the edge that we’ve got a
852
00:41:29.69 –> 00:41:38.920
lot less Charles still got some debris
853
00:41:32.72 –> 00:41:38.920
on there 55 millimeters a second
854
00:41:40.5 –> 00:41:46.030
we can still see that we’ve got some
855
00:41:42.73 –> 00:41:48.700
debris around the edge here there’s less
856
00:41:46.03 –> 00:41:51.430
of it and I suspect that this is just
857
00:41:48.7 –> 00:41:54.369
about hanging in there look the interest
858
00:41:51.43 –> 00:41:55.900
is becoming quite Brown we shall never
859
00:41:54.369 –> 00:41:59.980
be able to get away with that I don’t
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
860
00:41:55.9 –> 00:42:03.030
think with leather let’s push on 65
861
00:41:59.98 –> 00:42:03.030
millimeters a second
862
00:42:04.0 –> 00:42:09.010
now I saw a lot of smoke coming up on
863
00:42:06.31 –> 00:42:10.750
the top here and that tends to indicate
864
00:42:09.01 –> 00:42:12.190
to me that we haven’t cut through
865
00:42:10.75 –> 00:42:15.640
properly so I think we’ve probably
866
00:42:12.19 –> 00:42:17.770
reached our limit Wow yeah we’ve still
867
00:42:15.64 –> 00:42:19.599
got some black marks on there but
868
00:42:17.77 –> 00:42:23.770
they’re nowhere near as heavy as they
869
00:42:19.599 –> 00:42:29.200
were to start with okay so the next
870
00:42:23.77 –> 00:42:31.240
issue now is to try and solve the debris
871
00:42:29.2 –> 00:42:33.720
on the top surface here I’ve got a piece
872
00:42:31.24 –> 00:42:33.720
of duct tape
873
00:42:34.24 –> 00:42:39.430
I’m gonna stick that over the end of the
874
00:42:36.1 –> 00:42:42.190
nozzle as I said it’s not going to look
875
00:42:39.43 –> 00:42:48.070
pretty but what I got to do now is to
876
00:42:42.19 –> 00:42:51.400
give it a few pulses we had last time
877
00:42:48.07 –> 00:42:53.850
yeah we’re still got debris on the edge
878
00:42:51.4 –> 00:42:57.700
and we still got marking on the surface
879
00:42:53.85 –> 00:43:00.160
now the marking on the surface is all to
880
00:42:57.7 –> 00:43:02.170
do with the heiress’s what we’re trying
881
00:43:00.16 –> 00:43:05.020
to do is to get as much air as we can
882
00:43:02.17 –> 00:43:07.450
through the cut and not have any air
883
00:43:05.02 –> 00:43:10.000
come out on top of the job any smoke
884
00:43:07.45 –> 00:43:12.250
that comes upwards will get blown back
885
00:43:10.0 –> 00:43:14.410
down and that’s what you’re seeing here
886
00:43:12.25 –> 00:43:16.570
you’re getting smoke this black blown
887
00:43:14.41 –> 00:43:18.430
back down onto the job we’re trying to
888
00:43:16.57 –> 00:43:20.560
get as close to the job as we possibly
889
00:43:18.43 –> 00:43:22.660
can with the nozzle and so for my next
890
00:43:20.56 –> 00:43:23.720
trick what I’m going to do is I’m going
891
00:43:22.66 –> 00:43:26.890
to put an o-ring
892
00:43:23.72 –> 00:43:29.110
[Music]
893
00:43:26.89 –> 00:43:31.630
over the thread of the nozzle and that’s
894
00:43:29.11 –> 00:43:36.190
going to push the nozzle down closer to
895
00:43:31.63 –> 00:43:39.870
the work by about half okay so now
896
00:43:36.19 –> 00:43:42.640
you’re blowing an intense jet of air
897
00:43:39.87 –> 00:43:47.380
much concept of the work for millimeter
898
00:43:42.64 –> 00:43:50.320
gap now right on the edge of cutting
899
00:43:47.38 –> 00:43:51.730
your game at 65 millimeters it’s a
900
00:43:50.32 –> 00:43:54.340
second but we still haven’t got rid of
901
00:43:51.73 –> 00:43:56.020
this burn on the outside here which is
902
00:43:54.34 –> 00:43:58.420
puzzling right we’re now going to try a
903
00:43:56.02 –> 00:44:01.150
completely different approach I’ve
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
904
00:43:58.42 –> 00:44:03.580
removed this nozzle assembly I’m going
905
00:44:01.15 –> 00:44:05.190
to replace this with a tube that has no
906
00:44:03.58 –> 00:44:08.950
lens in it at all
907
00:44:05.19 –> 00:44:12.130
but what I’ve got here is a special
908
00:44:08.95 –> 00:44:14.350
nozzle and lens assembly that I have
909
00:44:12.13 –> 00:44:16.360
designed it’s called a compound lens
910
00:44:14.35 –> 00:44:20.560
there are two lenses in there that
911
00:44:16.36 –> 00:44:22.960
produce a very very sharp focus and I’m
912
00:44:20.56 –> 00:44:26.620
going to use this to see whether or not
913
00:44:22.96 –> 00:44:29.230
we can solve this problem of marking on
914
00:44:26.62 –> 00:44:32.320
the surface now this doesn’t come with a
915
00:44:29.23 –> 00:44:34.690
normal fitting it comes with a piece of
916
00:44:32.32 –> 00:44:37.840
tube that pushes into the nozzle there
917
00:44:34.69 –> 00:44:40.000
and we need to connect the nozzle up to
918
00:44:37.84 –> 00:44:42.070
the existing six millimeter tube the two
919
00:44:40.0 –> 00:44:45.400
tubes fit together you can hear that
920
00:44:42.07 –> 00:44:47.950
we’ve still got some air in there but
921
00:44:45.4 –> 00:44:50.860
it’s so low it’s not causing any down
922
00:44:47.95 –> 00:44:52.510
flow of air to blow debris back down
923
00:44:50.86 –> 00:44:55.060
onto the job so we’re going to take the
924
00:44:52.51 –> 00:44:56.920
completely officer approach now to what
925
00:44:55.06 –> 00:44:59.590
we would normally use for conventional
926
00:44:56.92 –> 00:45:01.960
cutting ie trying to blow the fumes out
927
00:44:59.59 –> 00:45:04.290
of the bottom of the job this lens has
928
00:45:01.96 –> 00:45:06.940
got a setting of about ten point five
929
00:45:04.29 –> 00:45:09.130
millimeters if you use it for engraving
930
00:45:06.94 –> 00:45:11.230
you’ve got to be very very careful to
931
00:45:09.13 –> 00:45:15.010
get the function to get the focus right
932
00:45:11.23 –> 00:45:16.910
but for cutting well ten point five will
933
00:45:15.01 –> 00:45:19.190
be good enough
934
00:45:16.91 –> 00:45:21.740
I going to do this without the
935
00:45:19.19 –> 00:45:23.160
extraction on to see just what smoke
936
00:45:21.74 –> 00:45:26.269
we’ve got and where it’s going
937
00:45:23.16 –> 00:45:29.999
[Music]
938
00:45:26.269 –> 00:45:32.130
and here we can see the difference so
939
00:45:29.999 –> 00:45:36.850
you’ve got virtually no smoke marks on
940
00:45:32.13 –> 00:45:40.139
here at all now the edge condition
941
00:45:36.85 –> 00:45:40.139
[Music]
942
00:45:42.3 –> 00:45:48.330
maybe slightly lighter on this one but I
943
00:45:46.23 –> 00:45:49.980
would suggest that now because we’ve got
944
00:45:48.33 –> 00:45:52.830
a much sharper lens
945
00:45:49.98 –> 00:45:55.860
we may actually be able to get up to 75
946
00:45:52.83 –> 00:45:58.230
millimeters a second or more
947
00:45:55.86 –> 00:45:59.960
should we be ridiculous and try 85
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
948
00:45:58.23 –> 00:46:03.030
memory is a second
949
00:45:59.96 –> 00:46:12.060
[Music]
950
00:46:03.03 –> 00:46:12.060
yeah it’s loose it’s clean very clean
951
00:46:13.549 –> 00:46:21.249
in the age condition remember I said the
952
00:46:17.209 –> 00:46:21.249
faster you go the less the charring
953
00:46:23.04 –> 00:46:29.730
because some but there’s very little on
954
00:46:26.13 –> 00:46:31.530
there that’s a pretty brown edge and
955
00:46:29.73 –> 00:46:34.770
we’re getting almost up to Engraving
956
00:46:31.53 –> 00:46:37.250
speeds now let’s try 95 millimeters a
957
00:46:34.77 –> 00:46:37.250
second
958
00:46:42.74 –> 00:46:48.310
[Music]
959
00:46:45.39 –> 00:46:52.770
just about on the limit we’ve just got a
960
00:46:48.31 –> 00:46:52.770
few fibers that are not cut
961
00:46:52.82 –> 00:46:55.780
with our edge condition
962
00:46:54.43 –> 00:46:57.600
[Music]
963
00:46:55.78 –> 00:46:59.980
is getting cleaner
964
00:46:57.6 –> 00:47:02.820
[Music]
965
00:46:59.98 –> 00:47:02.820
and cleaner
966
00:47:03.86 –> 00:47:09.170
and cleaner so you have conventional
967
00:47:07.01 –> 00:47:13.310
cutting technology that gets us up about
968
00:47:09.17 –> 00:47:14.780
65 min of eight is a second and then all
969
00:47:13.31 –> 00:47:17.930
of a sudden we could get a clean edge
970
00:47:14.78 –> 00:47:20.570
with the pusher sound up to 95 Melanie
971
00:47:17.93 –> 00:47:23.760
it’s a second with the compound lens
972
00:47:20.57 –> 00:47:23.760
[Music]
973
00:47:23.96 –> 00:47:28.010
well here we’ve got a piece of white
974
00:47:25.7 –> 00:47:29.720
leather you know this is stupid isn’t it
975
00:47:28.01 –> 00:47:31.850
trying to cut white leather this looks
976
00:47:29.72 –> 00:47:33.980
like nearly 2 millimeters thick I’m
977
00:47:31.85 –> 00:47:38.410
gonna back the speed off to 85
978
00:47:33.98 –> 00:47:38.410
millimeters a second for comfort
979
00:47:38.58 –> 00:47:43.110
we’re just check-in cases is a different
980
00:47:40.89 –> 00:47:47.250
thickness it will still got roughly ten
981
00:47:43.11 –> 00:47:49.349
and a half mil slightly thicker material
982
00:47:47.25 –> 00:47:52.730
and it’s not quite ten and a half we
983
00:47:49.349 –> 00:47:52.730
need to just reset the focus
984
00:47:59.96 –> 00:48:05.780
not quite this is a thicker material so
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
985
00:48:04.04 –> 00:48:08.290
we should have to back the speed off a
986
00:48:05.78 –> 00:48:08.290
little bit
987
00:48:17.45 –> 00:48:22.790
this is a very fluffy wooly material on
988
00:48:20.21 –> 00:48:25.390
the back and that’s why it’s not cutting
989
00:48:22.79 –> 00:48:25.390
very well
990
00:48:26.91 –> 00:48:32.200
we’ve still got a clean top surface so
991
00:48:30.58 –> 00:48:35.140
let’s find out where we need to go with
992
00:48:32.2 –> 00:48:37.540
this particular material we’ve just
993
00:48:35.14 –> 00:48:40.540
about cut that out at 45 millimeters a
994
00:48:37.54 –> 00:48:43.660
second but that is pretty thick material
995
00:48:40.54 –> 00:48:47.890
but that’s 2 millimeters thick and very
996
00:48:43.66 –> 00:48:51.910
very very on the back now this loose
997
00:48:47.89 –> 00:48:55.210
stuff on here will smoke and smoke
998
00:48:51.91 –> 00:48:57.190
absorbs the energy and so this is going
999
00:48:55.21 –> 00:48:59.140
to be this last little bit is going to
1000
00:48:57.19 –> 00:49:01.480
be very difficult for the laser to
1001
00:48:59.14 –> 00:49:03.310
pierce through cleanly you know the B
1002
00:49:01.48 –> 00:49:04.750
charring on the corners are something we
1003
00:49:03.31 –> 00:49:08.260
can do with separately because that’s
1004
00:49:04.75 –> 00:49:10.240
all to do with the speed of the
1005
00:49:08.26 –> 00:49:12.760
deceleration of the cut as it goes into
1006
00:49:10.24 –> 00:49:17.369
the corner so to get this to cut cleanly
1007
00:49:12.76 –> 00:49:17.369
I my wife to drop it to 35 millimeters
1008
00:49:17.98 –> 00:49:23.380
we’ve still got a fairly clean cut but
1009
00:49:20.29 –> 00:49:25.390
we’ve got a burning in the corners but
1010
00:49:23.38 –> 00:49:30.130
we can fix that fairly easily with Mac’s
1011
00:49:25.39 –> 00:49:33.940
mid speed so we’ve got 78 Mac’s and 10%
1012
00:49:30.13 –> 00:49:35.800
min min as almost as low as the machine
1013
00:49:33.94 –> 00:49:38.109
will go and there we go we’ve got more
1014
00:49:35.8 –> 00:49:39.400
or less clean corners now so it does
1015
00:49:38.109 –> 00:49:42.430
show you that the thickness of the
1016
00:49:39.4 –> 00:49:44.500
leather and the surface texture on the
1017
00:49:42.43 –> 00:49:50.170
back of the leather has a significant
1018
00:49:44.5 –> 00:49:52.030
effect on the cutting performance okay
1019
00:49:50.17 –> 00:49:54.250
now we’re going to go for a slightly
1020
00:49:52.03 –> 00:49:56.320
different approach again and this time
1021
00:49:54.25 –> 00:49:57.940
I’ve got my one inch square drawn on
1022
00:49:56.32 –> 00:50:01.119
here because I need to be able to change
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
1023
00:49:57.94 –> 00:50:04.510
the parameters fairly easily and what
1024
00:50:01.119 –> 00:50:07.300
I’ve done this time we’ve gone into dock
1025
00:50:04.51 –> 00:50:10.119
mode if you start off with the midpoint
1026
00:50:07.3 –> 00:50:12.460
one that’s a good nominal starting point
1027
00:50:10.119 –> 00:50:15.420
and then from there on probably the one
1028
00:50:12.46 –> 00:50:18.490
to change more than any is dot length
1029
00:50:15.42 –> 00:50:21.099
now I’ve got this currently set at forty
1030
00:50:18.49 –> 00:50:22.750
millimeters a second which is on a par
1031
00:50:21.099 –> 00:50:26.349
with the performance that we had
1032
00:50:22.75 –> 00:50:28.450
previously with the fluffy white leather
1033
00:50:26.349 –> 00:50:29.680
we’ll go back and we’ll try the fluffy
1034
00:50:28.45 –> 00:50:31.960
white leather but we’ll start off with
1035
00:50:29.68 –> 00:50:33.579
the so-called easier stuff which
1036
00:50:31.96 –> 00:50:37.000
remember we were able to get up to about
1037
00:50:33.579 –> 00:50:38.770
95 millimeters a second width but we’ll
1038
00:50:37.0 –> 00:50:39.670
try it in doc mode and I’ve got full
1039
00:50:38.77 –> 00:50:41.680
power again
1040
00:50:39.67 –> 00:50:44.619
we’re just punching straight the way
1041
00:50:41.68 –> 00:50:47.400
through with no air assist just lens
1042
00:50:44.619 –> 00:50:47.400
protection
1043
00:50:49.45 –> 00:50:57.020
but it has just about come out fluffy
1044
00:50:54.43 –> 00:50:58.850
yeah it’s reasonably clean but it’s
1045
00:50:57.02 –> 00:51:00.590
still it’s got a little bit of a
1046
00:50:58.85 –> 00:51:03.140
shadowing round here we’ve got some
1047
00:51:00.59 –> 00:51:04.850
debris coming up but this time because
1048
00:51:03.14 –> 00:51:05.420
the power is intermittent all the way
1049
00:51:04.85 –> 00:51:08.150
around
1050
00:51:05.42 –> 00:51:11.180
we’ve got no sustained power to burn off
1051
00:51:08.15 –> 00:51:14.590
the film trail that comes out behind the
1052
00:51:11.18 –> 00:51:19.220
cut so let’s have a look at the edge
1053
00:51:14.59 –> 00:51:20.060
well not a lot different to the standard
1054
00:51:19.22 –> 00:51:21.780
cut
1055
00:51:20.06 –> 00:51:23.730
[Music]
1056
00:51:21.78 –> 00:51:26.760
but I’ve changed the cut length now the
1057
00:51:23.73 –> 00:51:30.320
dot length from point one to point five
1058
00:51:26.76 –> 00:51:30.320
quite a significant difference
1059
00:51:34.18 –> 00:51:39.880
they dropped out cleanly and I would say
1060
00:51:37.27 –> 00:51:41.880
that that is probably dirtier I think
1061
00:51:39.88 –> 00:51:45.370
you can see that definitely these are
1062
00:51:41.88 –> 00:51:47.740
they’ve got a sort of a slightly dusky
1063
00:51:45.37 –> 00:51:50.050
hue around the edge whereas these do not
1064
00:51:47.74 –> 00:51:52.840
have now this is using a two inch lens
1065
00:51:50.05 –> 00:52:01.090
again and we couldn’t get up to 60
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
1066
00:51:52.84 –> 00:52:04.240
millimeters a second before and we’re
1067
00:52:01.09 –> 00:52:06.040
still struggling here so da ting really
1068
00:52:04.24 –> 00:52:10.060
doesn’t seem to make a great deal of
1069
00:52:06.04 –> 00:52:12.190
difference so here we’ve got the two
1070
00:52:10.06 –> 00:52:15.390
millimeter thick white leather which is
1071
00:52:12.19 –> 00:52:19.900
very furry and soft and difficult to cut
1072
00:52:15.39 –> 00:52:23.550
so this is a point three dot time and a
1073
00:52:19.9 –> 00:52:23.550
point five dot length
1074
00:52:27.52 –> 00:52:34.220
so we’re back to point one point one and
1075
00:52:30.8 –> 00:52:36.200
thirty milliliters a second and it’s
1076
00:52:34.22 –> 00:52:38.840
come out now that I’ve gone slower we’ve
1077
00:52:36.2 –> 00:52:41.000
still got some marking around the edge
1078
00:52:38.84 –> 00:52:44.570
here
1079
00:52:41.0 –> 00:52:48.770
and plenty of plenty of carbon on the
1080
00:52:44.57 –> 00:52:52.820
edge when we look at this leather it
1081
00:52:48.77 –> 00:52:56.540
looks almost like felt it’s got a very
1082
00:52:52.82 –> 00:52:59.560
very loose texture inside here which
1083
00:52:56.54 –> 00:53:02.480
means it’s holding lots and lots of air
1084
00:52:59.56 –> 00:53:05.150
inside which is why it’s so difficult to
1085
00:53:02.48 –> 00:53:13.379
cut it’s not a solid material
1086
00:53:05.15 –> 00:53:13.379
[Music]
1087
00:53:13.87 –> 00:53:18.350
it doesn’t want to come off its
1088
00:53:16.64 –> 00:53:21.920
definitely burnt on there to stop the
1089
00:53:18.35 –> 00:53:25.880
surface marking one trick that I often
1090
00:53:21.92 –> 00:53:28.370
use is this one so if I stay away from
1091
00:53:25.88 –> 00:53:30.190
the bars and just cut between the bars
1092
00:53:28.37 –> 00:53:35.740
[Music]
1093
00:53:30.19 –> 00:53:38.690
[Laughter]
1094
00:53:35.74 –> 00:53:41.990
we should get a nice clean finish on the
1095
00:53:38.69 –> 00:53:43.880
front surface then there we go
1096
00:53:41.99 –> 00:53:47.000
well there’s not a lot more to say
1097
00:53:43.88 –> 00:53:49.850
really leather is hide is relatively
1098
00:53:47.0 –> 00:53:53.000
straightforward soft leather depends on
1099
00:53:49.85 –> 00:53:55.370
the thickness depends on the fuzziness
1100
00:53:53.0 –> 00:53:57.950
and softness of the material although
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
1101
00:53:55.37 –> 00:54:02.330
this is the same feeling soft leather
1102
00:53:57.95 –> 00:54:05.510
it’s quite a dense leather but thin this
1103
00:54:02.33 –> 00:54:07.730
one is a very fluffy open poured leather
1104
00:54:05.51 –> 00:54:10.319
and has actually proved to be quite
1105
00:54:07.73 –> 00:54:13.180
difficult to cut
1106
00:54:10.319 –> 00:54:14.259
yeah the next question is can we engrave
1107
00:54:13.18 –> 00:54:17.650
this material
1108
00:54:14.259 –> 00:54:19.779
well my suspicion is not very well
1109
00:54:17.65 –> 00:54:21.759
because first of all it’s very difficult
1110
00:54:19.779 –> 00:54:26.410
to keep it flat I’ve got it sitting on a
1111
00:54:21.759 –> 00:54:28.450
flat metal surface here I’m gonna make a
1112
00:54:26.41 –> 00:54:31.269
lot of smoke now so I put the extraction
1113
00:54:28.45 –> 00:54:33.430
on well I’m suspecting we’re gonna have
1114
00:54:31.269 –> 00:54:36.490
a few problems with engraving on this
1115
00:54:33.43 –> 00:54:38.230
material we might be able to get through
1116
00:54:36.49 –> 00:54:42.059
the surface here because underneath
1117
00:54:38.23 –> 00:54:45.369
we’ve got a soft dish although it’s dyed
1118
00:54:42.059 –> 00:54:47.819
red we might get a pink contrast
1119
00:54:45.369 –> 00:54:47.819
underneath
1120
00:54:49.52 –> 00:54:58.660
[Music]
1121
00:54:56.41 –> 00:55:01.710
the running is very fast at 400
1122
00:54:58.66 –> 00:55:01.710
millimeters a second
1123
00:55:03.45 –> 00:55:10.220
and it really isn’t too bad
1124
00:55:07.94 –> 00:55:12.910
first of all let’s have a quick look at
1125
00:55:10.22 –> 00:55:12.910
what sort of
1126
00:55:13.03 –> 00:55:19.140
we’ve got a little bit of
1127
00:55:16.28 –> 00:55:24.780
debris tucked in these letters here
1128
00:55:19.14 –> 00:55:27.570
[Music]
1129
00:55:24.78 –> 00:55:29.280
on balance that’s not bad because we
1130
00:55:27.57 –> 00:55:32.790
don’t seem to have produced any burn
1131
00:55:29.28 –> 00:55:36.290
marks around the outside of the text and
1132
00:55:32.79 –> 00:55:36.290
it’s quite a reasonable contrast
1133
00:55:36.45 –> 00:55:39.829
white stuff
1134
00:55:43.39 –> 00:55:49.420
well to be fair what I should have done
1135
00:55:45.49 –> 00:55:51.010
is is to engrave that from the bottom to
1136
00:55:49.42 –> 00:55:53.260
the top
1137
00:55:51.01 –> 00:55:54.640
that we change this headstart position
1138
00:55:53.26 –> 00:55:56.830
to the bottom right hand corner and
1139
00:55:54.64 –> 00:55:58.420
repeat this as you can see that’s not
1140
00:55:56.83 –> 00:56:00.820
particularly pretty either it’s a bit
Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)
1141
00:55:58.42 –> 00:56:03.220
feels of it’s sticky the color
1142
00:56:00.82 –> 00:56:07.200
underneath is not bad I’ve just changed
1143
00:56:03.22 –> 00:56:10.090
the Machine setting to a special mode
1144
00:56:07.2 –> 00:56:14.500
which means it’s now going to produce a
1145
00:56:10.09 –> 00:56:17.290
high-frequency pulsing cut as opposed to
1146
00:56:14.5 –> 00:56:19.240
a continuous cut and that might allow us
1147
00:56:17.29 –> 00:56:21.100
to get a slightly cleaner cut because
1148
00:56:19.24 –> 00:56:26.599
we’re producing a series of dots as
1149
00:56:21.1 –> 00:56:30.799
opposed to a continuous burn and Wow
1150
00:56:26.599 –> 00:56:33.019
I said that’s done a good job hasn’t it
1151
00:56:30.799 –> 00:56:35.720
but it hasn’t really because look it’s
1152
00:56:33.019 –> 00:56:37.940
all smeared so we’ve got all our dirt
1153
00:56:35.72 –> 00:56:39.920
and debris in the bottom here and as
1154
00:56:37.94 –> 00:56:42.489
soon as you touch it look it marks over
1155
00:56:39.92 –> 00:56:42.489
the surface
1156
00:56:42.53 –> 00:56:48.140
we’ll do that one more time you can see
1157
00:56:45.5 –> 00:56:53.330
the smoke it’s just little bits of smoke
1158
00:56:48.14 –> 00:56:55.850
rising very very gently it’s not getting
1159
00:56:53.33 –> 00:56:59.060
a chance to blow back down onto the job
1160
00:56:55.85 –> 00:57:01.850
and paint the edge of the leather with
1161
00:56:59.06 –> 00:57:04.730
the debris as you can see it looks a
1162
00:57:01.85 –> 00:57:06.560
pretty good piece of text lovely and
1163
00:57:04.73 –> 00:57:09.560
clean around the edge I’ve got some
1164
00:57:06.56 –> 00:57:14.360
soapy wet kitchen towel here and I’m
1165
00:57:09.56 –> 00:57:17.890
just going to see whether or not Wow
1166
00:57:14.36 –> 00:57:17.890
okay so that works
1167
00:57:20.79 –> 00:57:29.430
well there we go just ordinary soap and
1168
00:57:24.57 –> 00:57:33.170
a soap and wetness cleans up this very
1169
00:57:29.43 –> 00:57:36.240
nicely it’s only just surface debris
1170
00:57:33.17 –> 00:57:40.050
these will clean up with soap and water
1171
00:57:36.24 –> 00:57:41.940
as well so maybe leather is not quite
1172
00:57:40.05 –> 00:57:43.770
the disaster that we thought maybe we
1173
00:57:41.94 –> 00:57:46.170
can work with it but I’ll leave you to
1174
00:57:43.77 –> 00:57:49.170
play with this on your own now having
1175
00:57:46.17 –> 00:57:52.100
seen what is possible and not catch up
1176
00:57:49.17 –> 00:57:52.100
with you in another session
Transcript for Cutting and Laser Engraving Leather and Hide
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