I am trying to use Sheetcam and seem to be having a workable time with the Mach 3 post processor when sending gcode generated by Sheetcam. However, I am trying to draw circles and it is not working well. Is this a problem with the post processor I am using? Is there any tips in getting this working correctly?
Correct post processor and tips with Sheetcam
From the original Synthetos forum (2011–2025)
Here is a sample of the type of code being sent:
N0170 G03 X1.0000 Y0.6520 Z-0.0625 I0.0000 J0.3480 F1.5748
I am not familiar with sheetcam, but looking at the above am guessing this is inch mode (G20) Gcode.
First recommendation would be to regenerate your job in MM (G21) mode and try that. TinyG is native mm, has to convert all inch dimensions, which sometimes causes accumulation of precision errors and triggers Gcode 'rule checks violations'.
There is a general issue with Gcode Arcs, G02 and G03 commands, not just circles.
Another fall back would be to have Sheetcam generate Gcode without arcs, rather use short G01 moves. Youl'll have to look into Sheetcam post processor options to see if that is possible.
That was the fix, I adjusted the post processor in sheetcam to output Minimum G-code with no arcs. I appreciate the help offered.
Good to know. Thanks for update.
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