36 – Let’s Make a Laser Rotary Engraving Fixture (39:52)

Transcript of Let’s Make a Laser Rotary Engraving Fixture

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[Music]

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welcome to another light plate learning

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map

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today I think it’s going to be another

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quite interesting session we’re gonna be

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making something

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but it’s something that you will

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probably use a lot

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once you see has

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rotary engraving is something that you

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probably might not be able to afford to

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do

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think placer do manufacture rotary

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grading systems they manufactured two

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types they manufacture one which is like

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a three jaw Chuck system which is a

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rotating system just like a chapter on

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lathe and they also manufacture a wheel

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system which basically is a

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circumferential drive system both

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results are for producing engraving on

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things like gases bottles rolling pin

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these pens those sorts of ground objects

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where you want to engrave a name or logo

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or something like that those engraving

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systems they’re not cheap several

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hundred pounds what I’m going to show

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you today is a very very simple

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for making a rotary engraving system it

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doesn’t involve using a motor or

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anything like that there is a saying

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around that says genius is a perception

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of the obvious that nobody else has

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recognized I wish that applied to me

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sadly it doesn’t a guy called Cesar

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Medina sent me a video of a device that

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he’d made for himself

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

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they’re brilliant doesn’t really

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describe it and you’ll understand what I

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mean when you see the final result I’m

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envious because I really wish that I had

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spotted it before myself but the glory

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must go to him so what we’re going to do

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is take the concept of what he did and

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modify it to suit this machine his

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design would have worked on this machine

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but there are some I consider some

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potential weaknesses in the principle

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when it’s applied to this type of

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machine so I’ve taken the basic fonts

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and I’ve reworked it but we should see

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how it comes out later on now at the end

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of this video I will give you links to

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his video they sent me and the design

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they sent me you can make the choice you

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can use his design or you can use this

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design this design will obviously appear

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on the pink Glaser web site so the

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choice will be yours now you won’t be

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particularly interested in watching

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machine cutting pieces you want people

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particularly interested in some of the

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design principles that I’ve used here

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but I will going through the quick

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basics of it when we come to finish the

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job and use it so let’s just cut the

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chat and get on with it

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okay now we’ve got some six millimeters

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of material and to be honest as you can

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see it’s a little bit too big for the

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machine I could hang it out underneath

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the door but often with a job like this

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I tend to cut the sheet off using the

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machine how do I do that well it’s very

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simple the first thing I’m going to do

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is to load my programming and then I’m

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going to set my origin at this corner

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here which you can’t see approximately

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on the towards the edge of the sheet

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okay now I’m gonna press the origin

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

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button then I’m going to do first of all

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I’m going to get a pen a marker pen but

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then I’m going to do a frame

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okay so about there

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is the size of material I want

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so I can do do it now do is to slide the

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material into the machine as far as

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it’ll go so that it’s nice and stable we

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need to set the focal distance up for

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this particular lens it’s five and a

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half millimeters so I will just set the

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height of the nozzle to suit now I don’t

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know at what speed I want to cut this

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but it isn’t particularly important I

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think I’m probably going to be easily

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over to cut this at probably six or

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seven millimeters a second so let’s just

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go to the speed I will we here you can

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set it up to seven the power is full

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power at 78 so I’ll now drive my head

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fully to the left we’ve got the

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extraction on we’ve got hair assist on

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so I just hold the pulse button down and

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the left hand arrow you know the baby’s

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not dragging so that’s not bad

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and it would make it to the end of the

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cup meal not quite let go right so

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there’s my cut and it has cut through

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look and all I’ve got to do now is a

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simple

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and it just breaks up at the end

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so there’s my pleasure material to use

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in the machine that is just slightly too

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big to sit on the table but what I’m

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going to do is but just raise the table

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enough to support it

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

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so now we need to set the speed back up

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otherwise it will be annoying when we

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come to use the machine

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speed

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1 1 7 that’ll do

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so now it moves around at a reasonable

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speed

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just check that the setting for the

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focus is correct to gain five point five

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millimeters one point five

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done

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now although I did my trimming off at

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seven millimeters a second I’m actually

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got this set to five millimeters a

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second

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but we’re just about coming to the end

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of our six millimeter cuts but just make

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us a little spaces here you know

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purposely designed these spaces it’s

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quite a long way apart from each other

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because as you see when they drop

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there’s no guarantee they’re going to

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drop straight down

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and I certainly don’t want the next

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spacer to overlap with its cut and

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damage it

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but that one fell a long way at position

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but it was well clear of this next one

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[Music]

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now as you can see there’s a useful

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piece of material left on the end here

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which if we try and save it we’ve got to

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

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save all the other bits at the end there

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as well it’s a bit bulky so what we need

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to do is really just be a bit prudent

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with our material usage and save this

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nice piece of material here for another

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application and what I’m going to do

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this time rather than do a complete cut

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I’ve got the speed set to about one

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hundred and twelve millimeters a second

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so I’m going to go across rather than

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cut the whole of the job all the way

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across what I’m going to do is just go

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across at this high speed with the pulse

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and go

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and back again

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now basically what I’ve done there is

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I’ve scored the job what I can now do it

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just break it off and we can throw this

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piece away now it’s often mentioned to

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you I love using the solid steel table

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because a it makes house kinking so much

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easier and with a little bit of this

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stuff you can take all stickiness off

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the table

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try and do that with a honeycomb table

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we’re cutting this three millimeter

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acrylic at about 15 millimeters a second

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I’ve got full power on which is about 60

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watts

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and have actually got fuller assist on

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this particular thing because I’m not

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interested in the quality of the H

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particularly I just want it to be a nice

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size and a nice clean cut and as you can

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see it drops out wonderfully well

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

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the dual note again that I’ve got this

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standing on a solid base plate and I’ve

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got it standing on little standoffs

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there to keep it away from the to keep

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it away from the back plate when we take

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a look at that

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the way in which the backing has shrunk

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away that tells me that I’ve got just a

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little bit too much power on there or I

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could go faster with the cut because

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that’s reflection of power off of this

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back surface

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it’s not doing any it’s not doing any

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damage to the product but it just tells

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me that I could run a little bit faster

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now as you can see this material here

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that I’ve got is basically a frosted

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material I can’t be choosy about the

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acrylic that I get because I get it for

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free and it could be any finish any

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color and it can be any thickness but

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hey beggars can’t be choosers I just

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collected by the bucketful and use it

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okay well we’ve got all our three

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millimeter pieces and all our six

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millimeter pieces here ready to start

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the assembly now to do that I shall need

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some of this cement here and this is

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from a company called bond right not to

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be confused for the company an American

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company called Bandhu right now sadly

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this company bond right is only in the

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UK but what I’m using here is a PT G

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weld cement which is capable of bonding

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acrylic as well as PE teacher I’m told

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that it takes just a little bit longer

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to bond a critic but it’s less likely to

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craze it so normally with extruded

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acrylic crazing is very evident and

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we’ve cast acrylic it’s less so so

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anyway we’ve got our material and I’ve

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

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dispensed a small amount of it into this

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little bottle here now I’ve only got

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about a quarter of an inch in the bottom

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of the bottle but that’s probably enough

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to do all of this job so you see a

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little cement goes a long way because it

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is basically just like water excuse me

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well I just talked about with rocket

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fuel well off we go then now the other

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thing that we’re going to need is a

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piece of kitchen roll this is two or

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three pieces two or three thicknesses of

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kitchen roll because this very thin

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watery cement passes right through

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sometimes and the excess needs to be

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soaked up but if you leave it standing

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still it will stick to the paper so I’ll

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show you what we’re going to do now the

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important thing here is to

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make sure we choose the right pieces

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that go together now we’re going to

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start off with this piece here which has

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got the bigger square hole in it

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and we can look at this piece here now

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it only fits in one way because if you

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fit it in the other way you’ll find that

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the holes don’t line up with the edge of

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the material so only Hitler literally

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just fits in one way like that and that

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now gives us the opportunity to fit

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these in now if you look at these you’ll

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see that they are actually bent

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something about the stress when they’re

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cut out of the sheet has been released

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and they’re bent but they’re purposely

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been made opposite hand to each other so

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that the bins go opposite ways so what

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we’re going to do we’re going to put

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them so that the inside edges touch that

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

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was the bananas touch in the middle and

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it’s the outside ends which sweep out

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okay now we’re going to drop that we’ll

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keep them as a pair the right way around

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so we’re going to drop that one in this

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side here like this we’re going to drop

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this one in this side you’ll see that

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the arms are actually splaying out but

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would you take care of that when we put

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the other end on so we do this end first

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basically it’s all held together so I’m

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going to put glue along probably half

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this edge and this corner and down there

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so I’m going to do a little bit along

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here along here and down there okay now

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I’m going to hold that together and that

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right about something like a minute to

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two minutes now bear in mind what I said

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we no need to move it around on the

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paper and if you look carefully you’ll

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see where the glue is so

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the paper now very quickly dry off

286
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because it evaporates extremely quickly

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right but just to make sure that the

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paper doesn’t stick to the bottom we’ll

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just move it around occasionally now

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purposely made this piece so you can’t

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put it in the wrong end it’s got to go

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this one big slot has got to go against

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all of these holes here now before I

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work on the other end I’m going to leave

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that for two or three minutes to let it

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dry because although it’s basically

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tacked together and held together at the

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moment it’s not solid and then what

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we’re going to do we will concentrate on

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another part now these parts here and

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these parts here go together in a very

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obvious way they just clip through there

303
00:15:40.56 –> 00:15:48.780
like that okay now the problem with this

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is we’ve got to make sure that the

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pieces underneath here aren’t the

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correct distance apart and then we’ve

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got a little Chapel of assembly juice

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

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for each one of them so these basically

309
00:16:00.33 –> 00:16:08.550
sit underneath like that and they’re

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just temporary just to hold the rails

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apart to the correct distance while

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we’re gluing them together so just sit

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them on there like that and what we’re

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trying to do is we’ll just tack these

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00:16:19.74 –> 00:16:23.880
together with a little teeny bit of glue

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at each one of these joints let’s make

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sure we don’t swap it and you can see we

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haven’t got very many pieces left it’s a

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very simple assembly we just move those

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out the way and let them dry on their

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little assembly Jynx and now by this

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00:16:38.49 –> 00:16:45.990
time this should be strong enough for us

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to work on the other end we’ve got to

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put this end plate on so we’ll plug the

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00:16:50.79 –> 00:16:55.080
end plate on then we’ll lift the whole

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thing up

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and drop it on to this

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plate underneath here like that so

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should I be able to do the same thing on

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here we’ll tack this together around

331
00:17:16.1 –> 00:17:22.970
here along here traveling door all

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00:17:19.73 –> 00:17:25.459
together in one go this time okay we’ll

333
00:17:22.97 –> 00:17:27.260
just leave that to harden off for a few

334
00:17:25.459 –> 00:17:28.850
moments before we finish off doing

335
00:17:27.26 –> 00:17:32.330
anything with that and we can probably

336
00:17:28.85 –> 00:17:43.250
now put some glue along the underneath

337
00:17:32.33 –> 00:17:45.650
side of these and there we go look if I

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00:17:43.25 –> 00:17:48.350
can show you that can you see the

339
00:17:45.65 –> 00:17:52.010
cracking that’s taking place on those

340
00:17:48.35 –> 00:17:53.990
surfaces there the micro cracks it

341
00:17:52.01 –> 00:17:56.540
happens on some surfaces but not all of

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00:17:53.99 –> 00:17:58.520
them that’s a little bit of cracking on

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

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that one but virtually nothing on that

344
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one so it’s a bit random and these

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little pieces here are now surface to

346
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requirements so whatever you do don’t

347
00:18:05.6 –> 00:18:10.880
try and glue those on to anything so

348
00:18:07.22 –> 00:18:14.630
that’s all the basic six mill assembly

349
00:18:10.88 –> 00:18:19.910
done with one minor exception and that

350
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is these pieces here now if we take a

351
00:18:19.91 –> 00:18:23.660
look at these you’ll see that these arms

352
00:18:21.559 –> 00:18:26.690
are bent as well and so consequently

353
00:18:23.66 –> 00:18:30.559
what I’ve done I’ve made some stiffening

354
00:18:26.69 –> 00:18:32.450
pieces and at the same time I’ve covered

355
00:18:30.559 –> 00:18:38.600
the middle of a glory for myself and for

356
00:18:32.45 –> 00:18:41.900
Caesar and basically what they’re doing

357
00:18:38.6 –> 00:18:43.790
they’re holding the arms straight I can

358
00:18:41.9 –> 00:18:46.850
see the glue running in the joint

359
00:18:43.79 –> 00:18:48.620
underneath okay well before we

360
00:18:46.85 –> 00:18:50.600
solidified this off we’ll just let that

361
00:18:48.62 –> 00:18:53.510
settle down and we’ve build the other

362
00:18:50.6 –> 00:18:55.580
three millimeter pieces well to complete

363
00:18:53.51 –> 00:18:57.500
the basic frame assembly we’ve just got

364
00:18:55.58 –> 00:19:01.280
these last few parts to assemble in

365
00:18:57.5 –> 00:19:03.470
three millimeter a creek now to do this

366
00:19:01.28 –> 00:19:05.870
I’d probably use something that I like

367
00:19:03.47 –> 00:19:07.820
to help me with fluid

368
00:19:05.87 –> 00:19:10.580
and that is my collection of rubber

369
00:19:07.82 –> 00:19:14.090
bands these holes have to line up with

370
00:19:10.58 –> 00:19:15.890
these holes on here so there is really

371
00:19:14.09 –> 00:19:18.110
really only one way for it to go

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00:19:15.89 –> 00:19:22.340
together so if we pop that in first so

373
00:19:18.11 –> 00:19:24.080
that puts together like that and here’s

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00:19:22.34 –> 00:19:26.330
where my rubber band comes in handy

375
00:19:24.08 –> 00:19:28.280
because just at this point here where I

376
00:19:26.33 –> 00:19:31.070
want to hold it all together

377
00:19:28.28 –> 00:19:32.090
I can put my rubber band there it now

378
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holds it all together

379
00:19:32.09 –> 00:19:42.290
we still got slots left in there I just

380
00:19:35.9 –> 00:19:49.280
run all that joint there and there turn

381
00:19:42.29 –> 00:19:52.190
it over to the back and that’s really a

382
00:19:49.28 –> 00:19:55.130
nice solid assembly now just keep it

383
00:19:52.19 –> 00:19:57.530
moving around just in case but while

384
00:19:55.13 –> 00:19:59.809
we’re waiting for that to dry we can go

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

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back to the main assembly we can look at

386
00:19:59.809 –> 00:20:06.380
adding some more glue to that assembly

387
00:20:03.46 –> 00:20:09.920
by which time this should be

388
00:20:06.38 –> 00:20:16.130
sufficiently solid for me to take the

389
00:20:09.92 –> 00:20:19.130
rubber band off and that fits in there

390
00:20:16.13 –> 00:20:21.920
but at the moment if I leave it like

391
00:20:19.13 –> 00:20:24.620
that it will only slide along that

392
00:20:21.92 –> 00:20:26.660
middle section there so what I’m going

393
00:20:24.62 –> 00:20:28.580
to do is to put it at this end section

394
00:20:26.66 –> 00:20:30.679
here and then what we’re going to do we

395
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put these runners on so that it stays at

396
00:20:30.679 –> 00:20:34.970
that height all the way along I’ll never

397
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be careful because I don’t want the glue

398
00:20:34.97 –> 00:20:41.929
to run down and stick to this bottom

399
00:20:38.75 –> 00:20:44.570
track here so I’m going to do is very

400
00:20:41.929 –> 00:20:47.809
carefully put a little blob of glue on

401
00:20:44.57 –> 00:20:51.650
this top corner like that just let it

402
00:20:47.809 –> 00:20:56.620
run down a little bit and start to dry

403
00:20:51.65 –> 00:21:00.679
off and then we’ll get it on like that

404
00:20:56.62 –> 00:21:03.190
we’ll hold it solidly okay that’s got

405
00:21:00.679 –> 00:21:06.010
this back to that side

406
00:21:03.19 –> 00:21:09.620
do the same on this side

407
00:21:06.01 –> 00:21:12.830
after about a minute or so we should be

408
00:21:09.62 –> 00:21:15.020
able to take it out we should be able to

409
00:21:12.83 –> 00:21:18.370
pop a little bit of glue just in these

410
00:21:15.02 –> 00:21:18.370
front corners here at the moment

411
00:21:19.19 –> 00:21:32.340
just there and know that they’re solid

412
00:21:22.89 –> 00:21:33.810
we should be able to go along and do all

413
00:21:32.34 –> 00:21:37.980
the others you can see glue running up

414
00:21:33.81 –> 00:21:44.970
onto the surface okay so now with a bit

415
00:21:37.98 –> 00:21:49.260
of luck when we drop that into here they

416
00:21:44.97 –> 00:21:51.390
should run smoothly all the way for any

417
00:21:49.26 –> 00:21:52.650
thread as I mentioned earlier I haven’t

418
00:21:51.39 –> 00:21:56.460
bothered to show you everything that

419
00:21:52.65 –> 00:21:59.820
I’ve been cutting I’ve got some two

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

420
00:21:56.46 –> 00:22:02.580
millimeter material here acrylic which

421
00:21:59.82 –> 00:22:06.480
I’ve cut into these little discs with

422
00:22:02.58 –> 00:22:09.360
three millimeter holes in I also got a

423
00:22:06.48 –> 00:22:11.610
two millimeter thick let’s call our

424
00:22:09.36 –> 00:22:14.940
packing piece which has got a strange

425
00:22:11.61 –> 00:22:18.450
shape in it and I’ve also got a piece of

426
00:22:14.94 –> 00:22:20.760
five millimeter thick material which has

427
00:22:18.45 –> 00:22:23.850
got the same strange shape in it

428
00:22:20.76 –> 00:22:26.100
now this is particularly delicate and

429
00:22:23.85 –> 00:22:27.810
it’s also just a little bit flexible and

430
00:22:26.1 –> 00:22:30.420
these little reliefs round the outside

431
00:22:27.81 –> 00:22:32.760
allow the bearing to just slip in nicely

432
00:22:30.42 –> 00:22:36.360
and the bearing just snugly pushes in

433
00:22:32.76 –> 00:22:39.090
there like that now that basically is a

434
00:22:36.36 –> 00:22:42.540
wheel the original design that Caesar

435
00:22:39.09 –> 00:22:45.720
created was based upon using rollerblade

436
00:22:42.54 –> 00:22:50.250
wheels which are almost three inches

437
00:22:45.72 –> 00:22:53.310
diameter and three inches diameter it’s

438
00:22:50.25 –> 00:22:56.160
about that size well as you can see I’m

439
00:22:53.31 –> 00:22:58.710
making my wheels substantially smaller

440
00:22:56.16 –> 00:23:01.500
so I’ve got a bear in here which costs

441
00:22:58.71 –> 00:23:03.750
about a pound I’ve got two o-rings here

442
00:23:01.5 –> 00:23:06.570
which cost a few pennies each provided

443
00:23:03.75 –> 00:23:08.430
I’d buy them sort of 20 to 50 at a time

444
00:23:06.57 –> 00:23:10.940
and it’s cheaper to probably buy 50 and

445
00:23:08.43 –> 00:23:14.070
throw the rest away than it is to buy

446
00:23:10.94 –> 00:23:18.210
buy them in twos and fours as you can on

447
00:23:14.07 –> 00:23:21.030
eBay so we don’t need just two we need

448
00:23:18.21 –> 00:23:25.020
two per wheel and we’re going to make

449
00:23:21.03 –> 00:23:26.900
six wheels we’ve got some m3 by 12

450
00:23:25.02 –> 00:23:32.100
millimeter long screw

451
00:23:26.9 –> 00:23:34.020
and we can put one of those we sensibly

452
00:23:32.1 –> 00:23:37.680
probably put two of them through a

453
00:23:34.02 –> 00:23:41.610
flange like that and then we can drop

454
00:23:37.68 –> 00:23:44.400
the bearing on top okay and then we can

455
00:23:41.61 –> 00:23:47.160
put our packing plate on now the packing

456
00:23:44.4 –> 00:23:49.020
plate has still got the plastic film on

457
00:23:47.16 –> 00:23:51.120
because basically it’s so thin and

458
00:23:49.02 –> 00:23:53.220
flimsy I was frightened to take the

459
00:23:51.12 –> 00:23:55.470
plastic film off of it okay and then we

460
00:23:53.22 –> 00:23:57.960
put the top flange on then we can put

461
00:23:55.47 –> 00:24:01.710
our nuts on and now we’ve got two

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

462
00:23:57.96 –> 00:24:04.470
o-rings and if two o-rings will fit

463
00:24:01.71 –> 00:24:10.110
snugly on there and sit neatly between

464
00:24:04.47 –> 00:24:11.670
the Fonz’s so we’ve made six wheels well

465
00:24:10.11 –> 00:24:14.910
we’re starting off on another day now

466
00:24:11.67 –> 00:24:16.350
and I’m sorry I’ve got a little bit of a

467
00:24:14.91 –> 00:24:18.030
croaky voice but I’m woken up this

468
00:24:16.35 –> 00:24:19.410
morning with a bit of a cold but the

469
00:24:18.03 –> 00:24:21.870
main thing that I wanted to show you was

470
00:24:19.41 –> 00:24:24.900
that last night when I assembled the

471
00:24:21.87 –> 00:24:27.120
wheels on this unit I noticed that

472
00:24:24.9 –> 00:24:32.060
things were not quite as perfect as I’ve

473
00:24:27.12 –> 00:24:34.470
dreamed of these bearings in here

474
00:24:32.06 –> 00:24:36.180
they’re not the most expensive bearings

475
00:24:34.47 –> 00:24:38.280
in the world but if you take a look you

476
00:24:36.18 –> 00:24:41.130
can see that they’ve got a little bit of

477
00:24:38.28 –> 00:24:44.340
wobble on them that one’s not quite as

478
00:24:41.13 –> 00:24:46.050
bad but basically they’re very cheap

479
00:24:44.34 –> 00:24:49.170
bearings that are pound each their

480
00:24:46.05 –> 00:24:51.000
function is a rolling function which is

481
00:24:49.17 –> 00:24:53.640
what I normally use them for and they

482
00:24:51.0 –> 00:24:55.640
serve that purpose wonderfully well if I

483
00:24:53.64 –> 00:24:59.520
apply any sort of load in this direction

484
00:24:55.64 –> 00:25:03.570
the last thing I really want is movement

485
00:24:59.52 –> 00:25:05.250
like that and so what I’ve done I’ve

486
00:25:03.57 –> 00:25:08.130
looked at the problem in a different way

487
00:25:05.25 –> 00:25:10.110
here’s the one bearing I’m just putting

488
00:25:08.13 –> 00:25:12.240
a small amount of load on it to show you

489
00:25:10.11 –> 00:25:13.860
the twist so in here we’ve got two

490
00:25:12.24 –> 00:25:17.360
bearings which are stacked against each

491
00:25:13.86 –> 00:25:20.400
other to reduce the risk of twists and

492
00:25:17.36 –> 00:25:22.560
that seems to work extremely well so I

493
00:25:20.4 –> 00:25:24.480
didn’t have enough bearings to double up

494
00:25:22.56 –> 00:25:26.220
all the way around and so I ordered some

495
00:25:24.48 –> 00:25:27.300
last night and they should be here in

496
00:25:26.22 –> 00:25:29.460
the post today

497
00:25:27.3 –> 00:25:30.560
well the bearings I ordered from RS

498
00:25:29.46 –> 00:25:34.910
Components

499
00:25:30.56 –> 00:25:38.060
arrived and we’ll get on and do some

500
00:25:34.91 –> 00:25:42.230
building now I’m already pre built some

501
00:25:38.06 –> 00:25:44.990
of the wheels but I’ll show you how to

502
00:25:42.23 –> 00:25:47.390
go about building this last one okay so

503
00:25:44.99 –> 00:25:51.080
I’ve got the same basically the same

504
00:25:47.39 –> 00:25:54.470
shaped pieces as I had before with a

505
00:25:51.08 –> 00:25:56.960
couple of exceptions instead of a piece

506
00:25:54.47 –> 00:25:58.850
of four millimeter thick spacer in the

507
00:25:56.96 –> 00:26:01.040
middle there what I’ve now got is three

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

508
00:25:58.85 –> 00:26:04.130
pieces of three millimeter

509
00:26:01.04 –> 00:26:05.810
I searched through my stock and as I

510
00:26:04.13 –> 00:26:08.720
mentioned to you before three millimeter

511
00:26:05.81 –> 00:26:11.510
at three millimeter acrylic comes in

512
00:26:08.72 –> 00:26:13.580
quite a large variation in tolerances

513
00:26:11.51 –> 00:26:16.010
now I’ve tried to use something that’s

514
00:26:13.58 –> 00:26:16.580
around about three point two millimeters

515
00:26:16.01 –> 00:26:18.710
thick

516
00:26:16.58 –> 00:26:22.970
so that basically three of these pieces

517
00:26:18.71 –> 00:26:27.590
make up the same as two bearings ten

518
00:26:22.97 –> 00:26:32.840
millimeters but it’s not crucial if you

519
00:26:27.59 –> 00:26:36.310
only using three millimeter stock now in

520
00:26:32.84 –> 00:26:38.810
addition to making these pieces look

521
00:26:36.31 –> 00:26:41.030
approximately the same there’s a slight

522
00:26:38.81 –> 00:26:43.910
difference there are two of them that

523
00:26:41.03 –> 00:26:46.130
have got one outside diameter and this

524
00:26:43.91 –> 00:26:48.710
third one we just got a slightly bigger

525
00:26:46.13 –> 00:26:52.180
outside diameter so if I put a piece of

526
00:26:48.71 –> 00:26:56.000
paper behind it you probably can see

527
00:26:52.18 –> 00:26:58.820
that the middle section a slightly

528
00:26:56.0 –> 00:27:01.370
larger diameter than the two side

529
00:26:58.82 –> 00:27:04.600
sections and there’s a good reason of

530
00:27:01.37 –> 00:27:04.600
that which I would explain in a minute

531
00:27:04.75 –> 00:27:08.960
but you need to understand that because

532
00:27:07.01 –> 00:27:13.250
you need to assemble them the right way

533
00:27:08.96 –> 00:27:16.160
around right so first of all we’ve

534
00:27:13.25 –> 00:27:17.680
assembled one of the outside rings one

535
00:27:16.16 –> 00:27:21.470
of the smaller rings

536
00:27:17.68 –> 00:27:26.570
we push that right down flat against the

537
00:27:21.47 –> 00:27:28.370
flange then we’ll drop a bearing now set

538
00:27:26.57 –> 00:27:30.980
the bearing on top there keep it as flat

539
00:27:28.37 –> 00:27:36.920
as possible and then gently apply

540
00:27:30.98 –> 00:27:38.660
pressure to it and it should pop in now

541
00:27:36.92 –> 00:27:42.010
we’re going to put the centre slightly

542
00:27:38.66 –> 00:27:42.010
larger down to ring on

543
00:27:42.17 –> 00:27:48.140
and that should push over the bearing as

544
00:27:43.94 –> 00:27:50.510
well then we’re going to drop the next

545
00:27:48.14 –> 00:27:53.120
bearing in and then finally we’re going

546
00:27:50.51 –> 00:27:54.830
to put the little outer ring on which is

547
00:27:53.12 –> 00:27:57.440
or the top ring which is the smaller of

548
00:27:54.83 –> 00:27:59.900
the strings and we push that down

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

549
00:27:57.44 –> 00:28:01.760
carefully and so that that slides over

550
00:27:59.9 –> 00:28:03.350
the bearing and the bearing should sit

551
00:28:01.76 –> 00:28:05.600
more or less flush with the top surface

552
00:28:03.35 –> 00:28:09.470
when we’ve got it fully assembled then

553
00:28:05.6 –> 00:28:13.630
we can drop the flange on and now we’ve

554
00:28:09.47 –> 00:28:15.880
got 3 m3 nuts to hold it all together

555
00:28:13.63 –> 00:28:18.919
right now

556
00:28:15.88 –> 00:28:21.160
just tighten them up gently not too

557
00:28:18.919 –> 00:28:21.160
tight

558
00:28:23.59 –> 00:28:29.990
just till you feel some pressure come on

559
00:28:26.14 –> 00:28:31.900
now finally we’ve got to put the o-rings

560
00:28:29.99 –> 00:28:35.780
on so we can slip the o-rings just on

561
00:28:31.9 –> 00:28:38.360
like that and the o-rings will naturally

562
00:28:35.78 –> 00:28:45.110
sit on the smaller section not the

563
00:28:38.36 –> 00:28:48.169
center section but now okay now they

564
00:28:45.11 –> 00:28:50.390
have been basically two assemblies that

565
00:28:48.169 –> 00:28:53.510
we’re going to make we’re going to make

566
00:28:50.39 –> 00:28:55.400
one set of static wheels a pair of

567
00:28:53.51 –> 00:28:58.190
static wheels which would be based

568
00:28:55.4 –> 00:29:01.580
around using a panhead screw which is M

569
00:28:58.19 –> 00:29:04.070
Phi by 25 millimeters long and just to

570
00:29:01.58 –> 00:29:05.809
make it neat we’ll put head in from the

571
00:29:04.07 –> 00:29:10.700
headed side of the screws and then we

572
00:29:05.809 –> 00:29:13.640
put an M Phi nut on the back and we’ll

573
00:29:10.7 –> 00:29:16.580
just tighten that up to make sure that

574
00:29:13.64 –> 00:29:19.610
it holds the two bearings snug and

575
00:29:16.58 –> 00:29:21.590
pulled together when we put it in here

576
00:29:19.61 –> 00:29:24.080
these little nuts on the back here I

577
00:29:21.59 –> 00:29:25.940
would like to to hit this face so what

578
00:29:24.08 –> 00:29:30.049
we need to do is just a space that out

579
00:29:25.94 –> 00:29:31.910
with a couple of m5 washers just to City

580
00:29:30.049 –> 00:29:34.880
clear of the surface then we should need

581
00:29:31.91 –> 00:29:38.440
an invite nut on the back there just to

582
00:29:34.88 –> 00:29:42.350
hold that will nicely in place and

583
00:29:38.44 –> 00:29:46.630
that’s a nice solid fix now no flex or

584
00:29:42.35 –> 00:29:49.840
movement in there on this other end here

585
00:29:46.63 –> 00:29:49.840
we’ve got

586
00:29:50.31 –> 00:29:56.880
a panhead screw again which is 40

587
00:29:53.55 –> 00:29:58.740
millimeters long and again what we’ve

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

588
00:29:56.88 –> 00:30:02.670
done we’ve held the bearings together

589
00:29:58.74 –> 00:30:05.520
with an m5 nut and then we’ve got three

590
00:30:02.67 –> 00:30:08.640
of our spaces that we made out of

591
00:30:05.52 –> 00:30:11.310
perspex and we slip them in there then

592
00:30:08.64 –> 00:30:12.690
we’ve got an m5 wingnut so now we’ve got

593
00:30:11.31 –> 00:30:16.170
a nice freewheeling

594
00:30:12.69 –> 00:30:18.600
trolley where the wheels on this end are

595
00:30:16.17 –> 00:30:21.030
at adjustable centres and the words at

596
00:30:18.6 –> 00:30:23.250
this end are fixed now here we’ve got a

597
00:30:21.03 –> 00:30:26.010
pair of loose wheels that are adjustable

598
00:30:23.25 –> 00:30:28.380
so we’re going to use an m5 by 40 long

599
00:30:26.01 –> 00:30:30.060
screw where we’ll lock the bearings

600
00:30:28.38 –> 00:30:32.850
together then we’ll put three of our

601
00:30:30.06 –> 00:30:34.380
space of washers on will fit this one in

602
00:30:32.85 –> 00:30:36.180
the same position as that one which is

603
00:30:34.38 –> 00:30:38.190
number three hole or weight from the

604
00:30:36.18 –> 00:30:40.620
middle and this slot here that I’m just

605
00:30:38.19 –> 00:30:42.900
putting my finger through is somewhere

606
00:30:40.62 –> 00:30:47.940
where we can match what I like to call a

607
00:30:42.9 –> 00:30:51.000
live end stop now fixed end stop would

608
00:30:47.94 –> 00:30:54.210
probably drag on the component that

609
00:30:51.0 –> 00:30:56.190
we’re trying to engrave I don’t want

610
00:30:54.21 –> 00:30:58.640
that to happen I need it to roll freely

611
00:30:56.19 –> 00:31:01.500
so what I’ve got here is a very small

612
00:30:58.64 –> 00:31:05.510
ball bearing I’m fixing the ball bearing

613
00:31:01.5 –> 00:31:09.090
on with a campus own screw and

614
00:31:05.51 –> 00:31:13.590
underneath the ball bearing we’ve got an

615
00:31:09.09 –> 00:31:16.530
m3 washer and that all fits on to this

616
00:31:13.59 –> 00:31:21.540
little bracket that I have made and

617
00:31:16.53 –> 00:31:23.420
cemented together the ball bearing can

618
00:31:21.54 –> 00:31:25.650
sit on the top if you really need it to

619
00:31:23.42 –> 00:31:28.080
but it means you sacrifice some

620
00:31:25.65 –> 00:31:31.500
adjustment but it’s designed to

621
00:31:28.08 –> 00:31:34.890
basically fit underneath and there we go

622
00:31:31.5 –> 00:31:37.200
so that’s the assembly we’ve got the

623
00:31:34.89 –> 00:31:41.570
washer underneath the bearing and the

624
00:31:37.2 –> 00:31:44.340
screw and then we could just lightly

625
00:31:41.57 –> 00:31:46.650
tighten up the whole assembly before I

626
00:31:44.34 –> 00:31:49.920
put all of this together I tapped an m4

627
00:31:46.65 –> 00:31:52.830
hole in there there is enough right

628
00:31:49.92 –> 00:31:54.840
there if you want to put a nut on there

629
00:31:52.83 –> 00:31:56.280
instead of tapping the hole that’s

630
00:31:54.84 –> 00:31:57.930
entirely up to you if you want to make

631
00:31:56.28 –> 00:32:00.330
the hole a little bit bigger you can

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

632
00:31:57.93 –> 00:32:02.070
either put it on this side which at

633
00:32:00.33 –> 00:32:06.270
times you may find handy

634
00:32:02.07 –> 00:32:10.020
to do but the design is originally to go

635
00:32:06.27 –> 00:32:13.140
on the back side so you twist it to put

636
00:32:10.02 –> 00:32:19.980
it in then we put the screw head on this

637
00:32:13.14 –> 00:32:27.510
side and on the back which will have a

638
00:32:19.98 –> 00:32:30.120
washer and then m4 wingnut now there are

639
00:32:27.51 –> 00:32:32.340
times when this wingnut will actually

640
00:32:30.12 –> 00:32:35.700
clash with this little piece that sticks

641
00:32:32.34 –> 00:32:37.440
out here it’s not really a big issue

642
00:32:35.7 –> 00:32:42.410
because you can find a position for the

643
00:32:37.44 –> 00:32:48.270
wing nut where it’s just tight enough

644
00:32:42.41 –> 00:32:51.540
you can slide this up and down and it

645
00:32:48.27 –> 00:32:53.550
won’t move right so that’s one

646
00:32:51.54 –> 00:32:54.930
possibility you might even have a spring

647
00:32:53.55 –> 00:32:57.240
washer that you can put underneath there

648
00:32:54.93 –> 00:32:58.370
to achieve the same result but that’s

649
00:32:57.24 –> 00:33:00.660
entirely up to you

650
00:32:58.37 –> 00:33:05.400
the point is that what we’ve got here

651
00:33:00.66 –> 00:33:07.560
now is an end stop which when you look

652
00:33:05.4 –> 00:33:12.420
at it from above is a little ball

653
00:33:07.56 –> 00:33:16.830
bearing okay now there are a series of

654
00:33:12.42 –> 00:33:22.890
slots in here which rise up three

655
00:33:16.83 –> 00:33:25.110
millimeters for every slot now sometimes

656
00:33:22.89 –> 00:33:28.380
you may possibly find that that stepping

657
00:33:25.11 –> 00:33:31.200
is too coarse and that you maybe need

658
00:33:28.38 –> 00:33:33.960
only a one millimeter step or a two

659
00:33:31.2 –> 00:33:36.630
millimeter step well if that is the case

660
00:33:33.96 –> 00:33:39.300
you’ll find that there are three of

661
00:33:36.63 –> 00:33:43.650
these plates one of them is marked up at

662
00:33:39.3 –> 00:33:49.080
0 one of them is marked up at +1 and the

663
00:33:43.65 –> 00:33:51.990
other ones marked up at +2 so number two

664
00:33:49.08 –> 00:33:54.510
will actually raise it up by two

665
00:33:51.99 –> 00:33:57.180
millimeters if you want to raise it up

666
00:33:54.51 –> 00:33:59.630
by three millimeters you put the zero

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

667
00:33:57.18 –> 00:34:02.100
back on and you move to the second slot

668
00:33:59.63 –> 00:34:05.730
so that means you’ve got increments of

669
00:34:02.1 –> 00:34:08.090
one millimeter right up and down this

670
00:34:05.73 –> 00:34:08.090
range

671
00:34:08.57 –> 00:34:12.869
okay well it’s about time I should think

672
00:34:11.04 –> 00:34:16.200
that I tried to explain how this

673
00:34:12.869 –> 00:34:18.869
the works we are going to demonstrate

674
00:34:16.2 –> 00:34:21.539
the simplest application for it at the

675
00:34:18.869 –> 00:34:25.829
moment which is using just an ordinary

676
00:34:21.539 –> 00:34:28.889
cardboard tube okay

677
00:34:25.829 –> 00:34:34.259
this is just a simple application to

678
00:34:28.889 –> 00:34:37.889
demonstrate the principle now in this

679
00:34:34.259 –> 00:34:41.009
first position here the wheels are the

680
00:34:37.889 –> 00:34:43.559
same height as each other so you’ll see

681
00:34:41.009 –> 00:34:45.149
that these wheels more or less although

682
00:34:43.559 –> 00:34:45.629
these are the patrolling wheels at this

683
00:34:45.149 –> 00:34:48.569
end

684
00:34:45.629 –> 00:34:53.190
these wheels here are just about

685
00:34:48.569 –> 00:34:54.749
touching just about touching the ground

686
00:34:53.19 –> 00:34:58.680
so they’re basically parallel with each

687
00:34:54.749 –> 00:35:04.319
other okay well the next thing to do is

688
00:34:58.68 –> 00:35:07.019
to drop that item in there and set the

689
00:35:04.319 –> 00:35:09.329
end stop this this thing here on the end

690
00:35:07.019 –> 00:35:12.329
we’ll set that to an appropriate height

691
00:35:09.329 –> 00:35:15.479
so that rubs on the bottom so the bottom

692
00:35:12.329 –> 00:35:17.130
of the job rolls against it and then we

693
00:35:15.479 –> 00:35:19.920
do the same on the other end basically

694
00:35:17.13 –> 00:35:21.660
we’ve been doing slide this forward and

695
00:35:19.92 –> 00:35:25.829
we can set the other end up so that that

696
00:35:21.66 –> 00:35:28.140
live stop also rests on the end of the

697
00:35:25.829 –> 00:35:31.529
job that means that this job is not

698
00:35:28.14 –> 00:35:33.119
allowed to float either way now okay so

699
00:35:31.529 –> 00:35:38.369
here you are standing in front of the

700
00:35:33.119 –> 00:35:40.349
machine and what we’ve got the

701
00:35:38.369 –> 00:35:44.069
originally design of this was for these

702
00:35:40.349 –> 00:35:47.549
pieces here down the side to be further

703
00:35:44.069 –> 00:35:50.489
forward so that in fact this edge here

704
00:35:47.549 –> 00:35:54.239
was touching on the cross acts as the

705
00:35:50.489 –> 00:35:59.069
beam of the machine and as the machine

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

706
00:35:54.239 –> 00:36:03.359
comes forward in its y-axis what it does

707
00:35:59.069 –> 00:36:07.680
it pushes this carriage forward like

708
00:36:03.359 –> 00:36:10.589
this now the same time as the carriage

709
00:36:07.68 –> 00:36:14.009
is coming forward the head is sliding

710
00:36:10.589 –> 00:36:16.440
backwards and forwards this way so the

711
00:36:14.009 –> 00:36:18.839
head is always in relation to these arms

712
00:36:16.44 –> 00:36:21.390
because these arms are fixed or pushed

713
00:36:18.839 –> 00:36:22.700
by the gantry so the head always stays

714
00:36:21.39 –> 00:36:24.829
in this central

715
00:36:22.7 –> 00:36:29.690
but the essence of it is that the gantry

716
00:36:24.829 –> 00:36:31.490
is pushing these arms forward and as it

717
00:36:29.69 –> 00:36:35.900
inches forward you can see what it’s

718
00:36:31.49 –> 00:36:37.280
doing it’s causing this to rotate now

719
00:36:35.9 –> 00:36:41.119
just in case you’re having trouble

720
00:36:37.28 –> 00:36:42.800
imagining how this thing works let me do

721
00:36:41.119 –> 00:36:45.680
this for you look I’ve got two marks on

722
00:36:42.8 –> 00:36:48.670
here and I put that up against that

723
00:36:45.68 –> 00:36:51.140
wheel there with the screw on the mark

724
00:36:48.67 –> 00:36:53.720
now we’ll bring this we’ll roll this

725
00:36:51.14 –> 00:36:55.880
forward so that the wheel goes forward

726
00:36:53.72 –> 00:36:59.119
one revolution and there we go look one

727
00:36:55.88 –> 00:37:05.300
revolution and we’ve reached that mark

728
00:36:59.119 –> 00:37:10.099
there no that’s because that happens to

729
00:37:05.3 –> 00:37:13.700
be the circumference of this wheel if I

730
00:37:10.099 –> 00:37:18.579
put this on here okay and now it will

731
00:37:13.7 –> 00:37:21.770
rotate the wheel one revolution there

732
00:37:18.579 –> 00:37:25.010
and I’ll put another mark on there at

733
00:37:21.77 –> 00:37:29.540
the top approximately if I put that mark

734
00:37:25.01 –> 00:37:32.690
on there let me get ready to here look

735
00:37:29.54 –> 00:37:35.030
that mark is on there so it’s direct

736
00:37:32.69 –> 00:37:38.540
one-to-one ratio the same amount of

737
00:37:35.03 –> 00:37:40.640
motion on here has happened down on the

738
00:37:38.54 –> 00:37:42.280
table and that one to one ratio remains

739
00:37:40.64 –> 00:37:44.780
the same

740
00:37:42.28 –> 00:37:48.470
even when I put something like this on

741
00:37:44.78 –> 00:37:51.500
here which is much bigger it’s still

742
00:37:48.47 –> 00:37:54.140
transmitting the same amount of distance

743
00:37:51.5 –> 00:37:55.790
on the table to the object that’s only

744
00:37:54.14 –> 00:37:57.589
not doing exactly the same thing

745
00:37:55.79 –> 00:37:59.300
there’ll be two inches of circumference

746
00:37:57.589 –> 00:38:00.710
or movement on there for two inches of

Transcript of Let’s Make a Laser Rotary Engraving Fixture (cont…)

747
00:37:59.3 –> 00:38:03.700
circumferential movement on there

748
00:38:00.71 –> 00:38:06.440
because they’re linked together by these

749
00:38:03.7 –> 00:38:09.230
circumferential drive wheels so it’s so

750
00:38:06.44 –> 00:38:13.790
elegantly simple that as I said I’m

751
00:38:09.23 –> 00:38:15.920
really envious of the design well having

752
00:38:13.79 –> 00:38:17.210
built the unit and described the

753
00:38:15.92 –> 00:38:19.190
principle of how it works

754
00:38:17.21 –> 00:38:22.130
I think we’re stopped at that point

755
00:38:19.19 –> 00:38:22.849
because we’re running out of time in the

756
00:38:22.13 –> 00:38:24.650
next session

757
00:38:22.849 –> 00:38:27.980
we’ve got a variety of all sorts of

758
00:38:24.65 –> 00:38:29.960
things here anything down to a pencil I

759
00:38:27.98 –> 00:38:31.940
don’t think they can quite get down to

760
00:38:29.96 –> 00:38:32.460
cocktail sticks but we can get as low as

761
00:38:31.94 –> 00:38:34.650
a pen

762
00:38:32.46 –> 00:38:36.960
and all these various sight cylinders

763
00:38:34.65 –> 00:38:39.810
then we’ve got the challenge of all

764
00:38:36.96 –> 00:38:41.040
these different shapes this one is

765
00:38:39.81 –> 00:38:42.540
particularly difficult because it’s

766
00:38:41.04 –> 00:38:46.920
quite a large taper and it’s very

767
00:38:42.54 –> 00:38:50.610
strangely balanced this one should be

768
00:38:46.92 –> 00:38:53.520
easy this one has a rather interesting

769
00:38:50.61 –> 00:38:58.950
challenge but now you’ll see why I left

770
00:38:53.52 –> 00:39:00.480
that groove between the o-rings so thank

771
00:38:58.95 –> 00:39:01.950
you very much for your time today and I

772
00:39:00.48 –> 00:39:05.460
will see you in the next session

773
00:39:01.95 –> 00:39:05.460
[Music]

774
00:39:44.23 –> 00:39:46.290
you