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  • johnB
  • johnB
17 May 2025 18:05

Raspberry with LinuxCNC direct interface

Category: Computers and Hardware

I wonder, is there a Raspberry HAT that can direct interface with a stepper driver ?

Thanks
Jonh.
  • pgf
  • pgf
17 May 2025 18:00

Effect of lengthening the servo thread period?

Category: Basic Configuration

I'm using a Raspberry Pi 4 to drive a Mesa 7i96.   For unknown (as yet) reasons, I can't reliably run without errors unless I bump SERVO_PERIOD to 2000000 (i.e., 2ms).

What affect will this have on machine operation?  I sort of understand what's scheduled to run in the base thread, which of course is largely (completely?) irrelevant now that I have the Mesa.  But I don't have a good mental model for what runs in the servo thread, so I don't have a good understanding of what happens to operation/performance if it only runs half as often as usual.  Where would the difference show up?

Until recently my mill maxed out at about 40ipm, so absolute performance wasn't really a consideration.  I've upgraded to a machine capable of at least 80ipm using Grbl, and initial tests with LinuxCNC and the Mesa card indicate 100ipm may be fine.  So now I'm wondering if I need to start worrying more about that servo thread.

paul
  • PCW
  • PCW's Avatar
17 May 2025 17:57
Replied by PCW on topic el5151 reseting counts

el5151 reseting counts

Category: EtherCAT

Yes, it seems like some encoder option is not set correctly.
Clearing the count on every index really makes no sense for
general encoder use.
  • Aciera
  • Aciera's Avatar
17 May 2025 17:22 - 17 May 2025 17:22
Replied by Aciera on topic Install Probe Basic

Install Probe Basic

Category: QtPyVCP

I don't really know but it seems to be set in the ini file:

 
  • zz912
  • zz912's Avatar
17 May 2025 17:22
  • Muftijaja
  • Muftijaja
17 May 2025 16:41

Two switches/sensors for tool length and 3d touching into motion-probe-in? Howto

Category: General LinuxCNC Questions

Thanks, PCW for this example! I try this out the next days. 
or2 is not used actually. 3D is NO and WZL is NC, otherwise I would have put them both in series.
I will see if I have to delete the -not for the 3D switch.
Thanks a lot and have a nice weekend!
Hanno
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