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Mar 2, 2021 - 7:51:39 PM
1632 posts since 4/13/2017

I know a guy who has a pantograph. He cuts pearl with it.

I've seen a lot of YouTube videos of pantographs built from scratch, and one even has plans available for $12.

The one with plans available has two scale settings: 2:1 and 3:1. One of my questions is this...is 3:1 small enough for cutting most inlays and inlay cavities?

If it isn't, how easy would it be to determine how to modify the design so that it can be set to 4:1 scale?

Will a Dremel cut through pearl? What kind of bit would I need?

Mar 3, 2021 - 4:50:35 AM

13472 posts since 6/29/2005

A pantograph is just a graphic device that reduces or enlarges things by using a pattern as a guide—a very crude precursor of a computer. You would have to attach a cutting device of some kind like a Dremel or pneumatic cutter to the pantograph, making a "kind of" CNC router.

Seems like a lot of work—what does it accomplish?  Pictures would help.

Edited by - Ken LeVan on 03/03/2021 04:52:29

Mar 3, 2021 - 5:25:58 AM

Petea

England

11 posts since 4/3/2010

Hi
It was easy to make my pantograph out of channel section aluminium and it cuts pearl accurately. I managed to cut a lot of inlays. However the Dremel was far too fast. I used a one millimeter diameter milling cutter which is easily broken. If you would like more details just say "more details please". I hope my photo is attached.
Pete


Mar 3, 2021 - 5:29:35 AM

Petea

England

11 posts since 4/3/2010

Yes it's easy to modify to change the ratio. I used 1:4.5 which was very satisfactory. You need to move the stylus further out to increase the ratio.
Pete

Mar 3, 2021 - 5:44:10 AM

1632 posts since 4/13/2017

quote:
Originally posted by Ken LeVan

A pantograph is just a graphic device that reduces or enlarges things by using a pattern as a guide—a very crude precursor of a computer. You would have to attach a cutting device of some kind like a Dremel or pneumatic cutter to the pantograph, making a "kind of" CNC router.

Seems like a lot of work—what does it accomplish?  Pictures would help.


Here is the video of the one I saw that had plans available. It was built for a Bosch Colt router, but the guy also provides plans to make it fit a "dremel" of sorts.

https://m.youtube.com/watch?v=vtm4u583YOQ&list=PL4FD63FF280901729&index=1

Mar 3, 2021 - 5:47:24 AM

1632 posts since 4/13/2017

quote:
Originally posted by Petea

Hi
It was easy to make my pantograph out of channel section aluminium and it cuts pearl accurately. I managed to cut a lot of inlays. However the Dremel was far too fast. I used a one millimeter diameter milling cutter which is easily broken. If you would like more details just say "more details please". I hope my photo is attached.
Pete


So would I be better off to get a motor made for running bits like that? My Dremel is variable speed and goes from 5000rpm to 35000rpm.

Mar 3, 2021 - 6:27:22 AM

1632 posts since 4/13/2017

quote:
Originally posted by Petea

Yes it's easy to modify to change the ratio. I used 1:4.5 which was very satisfactory. You need to move the stylus further out to increase the ratio.
Pete


So that is all that must must be done? The ratio is the like this, right?

Distance from the fixed point to cutter : Distance from the tracing point to the cutter

Mar 3, 2021 - 7:04:18 AM

Petea

England

11 posts since 4/3/2010

Distance from fixed point to cutter : distance from fixed point to tracing point.
If this ratio is 1 : 2 for example, errors in the pattern will be halved. If the ratio is 1 : 5 errors will be reduced by one fifth.
I think 5000 rpm might still be too fast.

Mar 3, 2021 - 7:08:56 AM

1632 posts since 4/13/2017

quote:
Originally posted by Petea

Distance from fixed point to cutter : distance from fixed point to tracing point.
If this ratio is 1 : 2 for example, errors in the pattern will be halved. If the ratio is 1 : 5 errors will be reduced by one fifth.
I think 5000 rpm might still be too fast.


Ahhh ok I was close on that formula haha.

That's what this Dremel is labeled as, 5000 to 35000, although the speed control wheel has a little slop in it, and it goes a bit past the 5 mark, and slows down even more, so maybe 4000 rpm? Probably still too fast.

I suppose I could get a motor for that type of thing.

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