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Old Jul 25, 2014, 09:16 PM
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danielphantom's Avatar
USA, CA, Temecula
Joined Jan 2009
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if you have a pic you want to post here--edit your post--go to advanced--scroll down to manage attachments--browse for where the picture is and click the + icon--it will load and then you can add a caption to the pic. Hit save and then close this window.

done deal

Daniel
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Old Aug 13, 2014, 07:32 PM
Sherpa
Schwemmer's Avatar
La Quinta, Ca.
Joined Sep 2003
1,633 Posts
Hello to all. I have finally finished my cutter and I am setting up the table configuration. My first question is about the screw thread. The table in the instruction guide says to put in the following;
m6 6mm 1
M8 8mm 1.25
M10 10 mm 1.50
M12 12mm 1.75

I have a screw thread of 2mm. What number would I put in. I am thinking 2 for 2mm but the table in the guide is not clear.

Thanks
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Old Aug 14, 2014, 02:07 AM
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danfield's Avatar
Fullerton, CA
Joined Nov 2004
1,805 Posts
If it is really 2 mm pitch then yes enter 2 in GMFC. Assuming it is a Single Start lead screw.

You can use any thread you want but for GMFC you need to convert to how far the carrige moves in one full revolution and in mm/s even if American UN threads.

Metric is easy, just enter what the pitch is.

UN threads ex: 1/4-20 TPI So this 20 turns per inch or 25.4 / 20 = 1.27 mm's per turn. 25.4 is mm/s per one inch. Enter 1.27 in GMFC

Next is what step mode your board is in. Assuming 200 step motors in Full Step enter 200, in Half Step enter 400. This is how many steps per revolution.
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Old Aug 14, 2014, 08:29 AM
Sherpa
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La Quinta, Ca.
Joined Sep 2003
1,633 Posts
Dan,

Thanks. I was using 2mm for the thread count but wondered why the difference in the guide. I have the steps set at 400 and it is moving the correct distances. More questions to come as I tune it up. Next step setting the heat and kerf.

Thanks.
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Old Aug 14, 2014, 11:05 AM
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Fullerton, CA
Joined Nov 2004
1,805 Posts
Well, when GMFC was CNC and only in French many years ago the only lead screw mentioned was 6 x 1mm and I thought that was it and it had to be used.

Assuming your wire is around .012 - .014 ish, leave the Kerf at its default, 0.8 / 0.15 and adjust the heat not the Kerf values. Your goal is to cut with just enough heat to do the job and not be dragging and or as cool as possible. Most start chasing the Kerf increasing its value because of too much heat or more than needed.

You can get there adjusting the Kerf but more heat than needed can cause issues later, curling thin airfoils and over burning TE
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