G3 command ignores and resets M67 feedrate?
- car_nut
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12 Jan 2025 23:27 #318832
by car_nut
G3 command ignores and resets M67 feedrate? was created 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:
Thank you!
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%
Thank you!
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- car_nut
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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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- rodw
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14 Jan 2025 01:30 #318914
by rodw
Replied by rodw on topic G3 command ignores and resets M67 feedrate?
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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