49 – Cutting and Engraving Leather and Hide (57:47)

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.

Laser Engraving Leather: High Resolution Laser Engraving
Laser Engraving Leather: High Resolution Laser Engraving

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

235
00:10:58.54 –> 00:11:04.490
we’ve got all four corners here so this

236
00:11:01.67 –> 00:11:07.690
is a very unsatisfactory way I can’t see

237
00:11:04.49 –> 00:11:10.700
a way of getting rid of that smoke

238
00:11:07.69 –> 00:11:13.970
normally on wood it’s pretty easy to get

239
00:11:10.7 –> 00:11:16.100
rid of on lever it looks as though it’s

240
00:11:13.97 –> 00:11:19.880
going to be a bit of a problem there is

241
00:11:16.1 –> 00:11:23.070
a fairly simple solution

242
00:11:19.88 –> 00:11:24.600
provided you’re only cutting

243
00:11:23.07 –> 00:11:32.949
we’ll turn the job over

244
00:11:24.6 –> 00:11:34.809
[Music]

245
00:11:32.949 –> 00:11:36.459
so there we are we can still see the

246
00:11:34.809 –> 00:11:39.009
burn marks on the corners although

247
00:11:36.459 –> 00:11:42.819
they’re not quite as bad because this

248
00:11:39.009 –> 00:11:46.089
material doesn’t hold on to the smoke as

249
00:11:42.819 –> 00:11:48.009
easily as this lovely shiny surface on

250
00:11:46.089 –> 00:11:51.579
this side so now you see we’ve got

251
00:11:48.009 –> 00:11:53.290
almost a smoke free cut as opposed to

252
00:11:51.579 –> 00:11:55.650
the first two at the bottom there as you

253
00:11:53.29 –> 00:11:58.680
can see here

254
00:11:55.65 –> 00:12:01.500
we’re producing a lot of smoke that’s

255
00:11:58.68 –> 00:12:02.700
going downwards and condensing you know

Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)

256
00:12:01.5 –> 00:12:06.329
this is horrible

257
00:12:02.7 –> 00:12:09.239
really horrible sticky stuff

258
00:12:06.329 –> 00:12:12.350
this is worse than wood just take this

259
00:12:09.239 –> 00:12:16.049
off while it’s nice and fresh and sticky

260
00:12:12.35 –> 00:12:18.059
it comes off nice and easily so nothing

261
00:12:16.049 –> 00:12:21.589
has changed from my first experience of

262
00:12:18.059 –> 00:12:24.529
leather it’s difficult to keep clean

263
00:12:21.589 –> 00:12:27.169
when you’re cutting it

264
00:12:24.529 –> 00:12:31.629
now the last time I had this problem the

265
00:12:27.169 –> 00:12:35.539
solution was very simple masking tape or

266
00:12:31.629 –> 00:12:38.059
there’s something called paper transfer

267
00:12:35.539 –> 00:12:41.119
tape which is used in the transfer of

268
00:12:38.059 –> 00:12:43.789
vinyl transfers onto things like vans or

269
00:12:41.119 –> 00:12:46.660
shop windows don’t get the plastic one

270
00:12:43.789 –> 00:12:49.690
get the paper version

271
00:12:46.66 –> 00:12:52.579
and that does just the same job and you

272
00:12:49.69 –> 00:12:54.640
can gather in wide reels

273
00:12:52.579 –> 00:12:58.390
fumes

274
00:12:54.64 –> 00:12:58.390
[Music]

275
00:13:00.71 –> 00:13:05.330
back down to where it was previously

276
00:13:02.57 –> 00:13:08.330
when the pieces fell oh so we’ve got 13

277
00:13:05.33 –> 00:13:11.300
millimeters a second 11 percent power

278
00:13:08.33 –> 00:13:15.130
for the coroners minimum and 85 percent

279
00:13:11.3 –> 00:13:15.130
power for the rest of the cat

280
00:13:16.17 –> 00:13:19.790
[Music]

281
00:13:17.87 –> 00:13:21.980
we could just check this piece out and

282
00:13:19.79 –> 00:13:23.750
that’s fairly clean on the back as we

283
00:13:21.98 –> 00:13:25.730
would expect it to be provided it

284
00:13:23.75 –> 00:13:28.940
doesn’t drop and then of course on the

285
00:13:25.73 –> 00:13:32.300
front here we can just peel off the tape

286
00:13:28.94 –> 00:13:35.690
and as expected it’s perfectly clean so

287
00:13:32.3 –> 00:13:37.580
that’s a solution and that’s the only

288
00:13:35.69 –> 00:13:40.160
solution that I came across before to

289
00:13:37.58 –> 00:13:41.870
crafting this sort of leather mask it

290
00:13:40.16 –> 00:13:43.850
all

291
00:13:41.87 –> 00:13:48.020
now if we’re having this much trouble

292
00:13:43.85 –> 00:13:49.790
with leather cutting it what on earth is

293
00:13:48.02 –> 00:13:52.029
it going to do when we try and engrave

294
00:13:49.79 –> 00:13:52.029
it

295
00:13:52.69 –> 00:13:59.430
[Music]

296
00:13:56.829 –> 00:14:01.660
well that 115

297
00:13:59.43 –> 00:14:04.960
[Music]

Transcript for Cutting and Laser Engraving Leather and Hide (Cont…)

298
00:14:01.66 –> 00:14:10.780
as you can see it looks pretty messy so

299
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

303
00:14:21.57 –> 00:14:26.460
exercise you can clean all these little

304
00:14:23.85 –> 00:14:29.430
bits of tape out from the letters and if

305
00:14:26.46 –> 00:14:31.020
you’ve got things like ours and B and

306
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

309
00:14:37.62 –> 00:14:43.980
to show you that to show you the problem

310
00:14:39.99 –> 00:14:46.620
that you have with engraving texts you

311
00:14:43.98 –> 00:14:49.380
still get all this brown stuff and in

312
00:14:46.62 –> 00:14:52.680
fact it’s even worse because there is

313
00:14:49.38 –> 00:14:56.340
nowhere for this stuff to go other than

314
00:14:52.68 –> 00:14:59.310
upwards or sideways what happens is as

315
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

317
00:15:02.37 –> 00:15:07.710
bit like dropping if you’d like a stone

318
00:15:04.8 –> 00:15:10.410
into a soft pile of sand some of it will

319
00:15:07.71 –> 00:15:12.870
go up a lot of it will go sideways and

320
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

322
00:15:16.29 –> 00:15:23.190
I’ve made several significant changes

323
00:15:19.35 –> 00:15:25.680
first of all we’ve put the engraving the

324
00:15:23.19 –> 00:15:27.030
universal engraving nozzle on here which

325
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

327
00:15:29.73 –> 00:15:34.110
air pipe coming into here as you can see

328
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

331
00:15:39.81 –> 00:15:44.280
you probably can hear

332
00:15:41.88 –> 00:15:46.740
[Music]

333
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

336
00:15:53.22 –> 00:15:58.200
there at all there’s virtually nowhere

337
00:15:54.84 –> 00:16:00.000
just enough to protect the lens okay now

338
00:15:58.2 –> 00:16:02.730
in addition to that you’ll see that now

339
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

345
00:16:14.01 –> 00:16:19.770
eruption that happens to come up in the

346
00:16:16.89 –> 00:16:22.650
air even though this airflow here is

347
00:16:19.77 –> 00:16:25.650
very small when it goes through that

348
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
00:16:47.55 –> 00:16:53.010
force the deeper we go the more

358
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

366
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
00:17:21.46 –> 00:17:25.130
[Music]

373
00:17:26.21 –> 00:17:33.490
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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