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I'm running LinuxCNC/Axis 2.9.0-pre1..... on LMDE 6, using software stepping. I have a 3 axis CNC, with two motors on the X. Initial condition has the motherboard parallel port controlling the motors and a second parallel card doing some other details. One X motor works, the second does not.

I was trying to connect my g540 disable to the parallel port and one motor quit working, the 4th axis on the g540 (which is my second X motor, see image). Using an oscilloscope, I can see step/direction for the parallel port pins 2,3 (x) 4,5 (y) and 6,7 (z) when I use the arrow keys. Pins 8,9 have nothing when I use the arrow keys for x. I  figured I had blown up the parallel port, but somehow just those two pins.

Bought a PCI parallel card, changed stepconf to use that card instead of the MB parallel port. Same deal, I can move the X motor but the X2 motor doesn't do anything. I measured the new parallel port pins, same result. I can measure step/direction for pins 2-7, but pins 8 and 9 do nothing.

Somehow the signals on the 4th channel, pins 8-9, is not getting through. I think I have Stepconf set up right, it was a working machine before.

Help will be greatly appreciated!
Steve
 

Hey, i have a question about configuring a 6axis robot arm with lcnc, ive built myself a robot arm and im trying to control it via a puma560 simulation config, ive seen a youtube short of someone doing exactly that but he has no documentation on how he did it, im new to lcnc so i dont really know where to start with configuring physical pins, for context im using a rpi5 and want to use gpio pins for step/dir, ive got some tmc 5160t drivers to work and i get motion from them i just dont know how i would assign physical gpio pins to the already existing config Below ive linked the short where a robot arm is controlled by the puma560 config, if you stop at the right time you can see the tab name: youtube.com/shorts/js6OaVhUN2U?si=68d75rJqwbvCr9V0

tommylight wrote:

Is the void lock disabled?
Old info, but had this happen often on PlasmaC while it was still being developed, does require setting VAD at under 75% and disabling void lock.
Did not happen probably last two years.
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Also does absolutely require monitoring the voltage, as it can be caused by the plasma source dropping the voltage due to heat or mains voltage going up (transformer plasma) or issues with current control (inverter plasma).

Thanks Tommy. We had not discounted plasma voltage changes and had some ideas to check if that is it.