G2/G3 Arc tolerance problem

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06 May 2010 21:15 #2813 by GStewart
I have been having trouble porting over my old programs to EMC. I am getting arc tolerance problems. When I plot the arcs in MasterCam they are within .0001. Digging around I thought that I saw that the tolerance for inches was .0001. Is there some way to loosen up the tolerance so that my old programs will run without modification? I have 100's of these old programs it would be nice if I didn't have to redo them all.
Thanks

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07 May 2010 10:37 #2815 by BigJohnT
The tolerance is 0.0002" for inches.

www.linuxcnc.org/docview/html//gcode_main.html#sub:G2,-G3:-Arc

You might write a python program to fix your arcs.

John

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07 May 2010 17:32 #2819 by GStewart
I went and checked it myself this morning and it seems that the problem is that the program is in absolute arc center and the control is looking for incremental arc center (I should know better than to trust the operator :) )

Is there a way to change this? I would much rather have my programs in absolute arc centers.
Thanks
Glenn

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08 May 2010 11:16 #2823 by BigJohnT
Glenn,

I just looked at the docs and I don't think there is a way to use absolute arc numbers.

John

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08 May 2010 16:47 #2828 by GStewart
OK I will have to find another solution, Thanks for the help John

Glenn

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08 May 2010 23:24 #2831 by BigJohnT
One is for sure if you don't make mistakes your not doing anything read this...

www.linuxcnc.org/docview/html//gcode_main.html#r1_37

John

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11 May 2010 23:52 #2841 by GStewart
Thanks John,
Mark another one as solved.
I really appreciate the help.
Glenn

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16 Nov 2010 13:03 #5332 by andypugh
G90.1 puts EMC2 in absolute Arc centre mode. I don't know if it did when this question was first asked.

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