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

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. Thinklaser’s Lightblade 4060 has a 400 x 600mm bed size and was supplied with a 60W EFR laser tube. In this session Russ, Russ Designs and builds a laser rotary engraving fixture

Laser Rotary Engraving Fixture
Laser Rotary Engraving Fixture

Contents

  • (Editor’s note: Russ gives an explanation of how the fixture works at 34:08.)
  • (The DXF file for this project is located here)
  • Introduction to rotary engraving systems.
  • Project based on Cesar Medina’s inexpensive rotary engraver concept – his video is here.
  • Cutting off material using the machine.
  • Setting up the material in the machine.
  • Making the device on the laser.
  • Scoring to break off excess material.
  • Power and speed required for the job.
  • Assembling 6mm parts of the rotary engraver.
  • Use of Bondrite PETG Weld Cement – less likely to craze acrylic when bonding.
  • Cast acrylic much less likely to craze than extruded acrylic.
  • Use of paper towel to absorb excess cement.
  • Crazing occurring on some surfaces.
  • Assembling the 3mm parts of the engraver. Assembly of 2mm parts and insertion of bearings, O-rings and screws.
  • Discovery of wobble on wheels.
  • Doubling up and buying new bearings from RS Components (Part Number 612-5789)
  • Assembly of the new design of wheels including nut, screw and washer sizes.
  • Explanation of how the rotary engraving fixture works.
  • (Editor’s note: For the link shown at the end of the video to Cesar’s video, please see here.
  • The other link now seems to be broken, i.e. the file has been removed or similar.)

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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Video Resource Files

DXF document – Russ rotary engraving system

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External Resource Links

www.thinklaser.com

www.rdworkslab.com

What can a laser cutter cut?

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Transcript of Let’s Make a Laser Rotary Engraving Fixture

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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

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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

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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

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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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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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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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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

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here along here traveling door all

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together in one go this time okay we’ll

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

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

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

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now put some glue along the underneath

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

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can show you that can you see the

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

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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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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

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one so it’s a bit random and these

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little pieces here are now surface to

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requirements so whatever you do don’t

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try and glue those on to anything so

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that’s all the basic six mill assembly

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

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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

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pieces and at the same time I’ve covered

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

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Caesar and basically what they’re doing

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

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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

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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

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

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these holes on here so there is really

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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

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that puts together like that and here’s

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where my rubber band comes in handy

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

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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

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holds it all together

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

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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

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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

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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

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