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I would stick to the thcad-2 with a scaling resistor. I can't really see a use case for the thcad-300
Please use a seperate 48v 7-10 amp power supply for motors.  24 v is waaay underpowered
Meanwell MDM-60-24 and  MDM-10-5 would be better choices than the cage power supplies shown.
All motors should have a seperate ground wire back to the star ground so emi does not attempt to pass across linear bearings. Hyrperthem have a good grounding document. Follow it.
I get frustrated when I see suboptimal designs accepted as gospel just because they have used pretty pictures but its a good start
Grab a couple of Mesa COMMX2 bus bars when you get your 7i96s. Also get some of their Din rail mounts.

Also just for me, use a multimeter and check if there is resistance between the torch tip and the work clamp. Most plasmas add a 100k resistor or similar to bring the current on the raw output down to non lethal levels. If so, you can mount the thcad in the control box if you are lazy.

tommylight wrote:

Out of curiosity, how much is a RPI and a good touchscreen these days?
Wondering as i got a Lenovo X1 Carbon Yoga for 120 and a Lenovo Yoga Y370 for 220, bot work for LinuxCNC with Mesa, both have 120Hz touchscreens, very high quality ones, very good keyboards, and both do over 4-6 hours on batteries.

hmmm, thanks for the tip. That might be a good option.

 I seem to recall comments about not using laptops because of the power saving features. Did you have to disable those in BIOS or elsewhere?
 

Looks like a mesact bug.

In the mean time you could just copy/paste/renumber
the stepgen section from another axis to get it working.

issue
github.com/LinuxCNC/linuxcnc/issues/3196
pull
github.com/LinuxCNC/linuxcnc/pull/3197

I home this is correct, if not please let me know.

Can you please try this later version of the linuxcnc image
drive.google.com/file/d/16xQfd_zXuXXKXqO...IY0/view?usp=sharing
I believe the screen issues are solved because the underlying Pi code had some fixes

Note, I only skipped the first 4 inputs pins so they are available for (up to 2)
MPGs.  If you do not have a MPG, starting a pin 1 (input 0) makes more sense.

LinuxCNC does not really resume when the E-Stop button is released (unlocked).

You have to start the G-Code over again.

Can you also post the output of "ethercat pdos". It is likely the drives may not have all the PDOs you are referencing configured. Did you use the drive manufacturers software to configure them?

@Grotius,

I was suggesting you would need ESI support if you wanted to be able to avoid having to have special code for specific devices like linuxcnc-ethercat does. Ie, if you were wanting it to work something like twincat or other commercial products do.

@Endian,

Have you seen any issues on ethercat with the current position dropping to zero intermittently...noticed on the DRO? I've been attempting to use LCNC on a machine that has G1 acceleration of 1m/s and G0 acceleration of 3m/s (feed is 25-50m/min) and I keep getting following errors.

did you found a way to set resolution?

thanks in advacnce

Minimum would probably be 1:10 for a Nema 23 or 34 motor, should be usable up to 1:30.
I would reference from the other side of the equation, 2-3 meters per minute of cut feed rate for 40A to 60A plasma, so for 150mm tube that would make 4 turns per minute roughly, easily done, but for 50mm tube that would be roughly 15 turns per minute.
The good thing with steppers in this case is more torque at lower speed, so start form 3 to 5 turns per minute and see what you can get on a high side.