G3 command ignores and resets M67 feedrate?

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12 Jan 2025 23:27 #318832 by car_nut
Hello all, could use some help.  Currently in the final throws of getting a new build up and running:
QtPlasmaC V2.9-238.314
Raspberry Pi5
Mesa IO boards
Sheetcam and associated post processors

I realized that my THC was active on holes, which then led me to see that M67 commands weren't working for my holes.  Further investigating showed the following:
  • M67 is working as I expect it to if G1 linear commands follow in lines below
  • When a G3 is encountered, it resets feedrate to 100% and executes the arc at 100%
  • I didn't test G2 yet
  • If an inline M67 is issued with the G3, it will execute the arc at commanded rate.  For example, have the following as one line of code:
    • G3 X0.0 Y0.0 I-0.2 J-0.2 M67 E3 Q50
  • However, after executing the above correctly it STILL resets feedrate back to 100%
I don't believe this is the expected behavior, my apologies if it is.  If it is the expected behavior, can someone point me to a Sheetcam post processor that would format it as such?

Thank you!

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13 Jan 2025 15:31 #318869 by car_nut
Replied by car_nut on topic G3 command ignores and resets M67 feedrate?
Doing some more probing on this. It looks to be related to the QtPlasmaC native hole/radius sensing. If I set it to "#<holes> = 0" mode everything seems to behave. I was trying to leverage the native hole sensing to implement overcut. Guess I'll have to work through having Sheetcam handle that logic and workflow.

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14 Jan 2025 01:30 #318914 by rodw
There are some variables to enable hole mode etc in the top of the plasmac post processor in sheetcam. They may help

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