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Looks good. I dont think you have issues with the voltage levels. In another thread I said I would scope out the work to electrode voltage to show what those voltages are, but unfortunately I have not had the chance, maybe next week.
When you use the divided arc voltage, you could put this design in to your easercat pcb, as in you dont need it to be separate.
If you find a decent 16-bit one example ADS1114IDGST then it might be worth the money. The 16-bit one gives you more opportunities if you want to make some additional features in the future, its quite a bit more expensive I know.
For the OP-amp if you find something with more tolerance in the input, that would make it safer but may not be worth it.

If you can give me an email address where you can be reached, I can share you an ohmic sensing schematic if you want to try it out and then share to the community.

hi Scotta
I wanted to compliment you on the work you have done and made available
to the LinuxCNC community.
I am excited about it and I bought an NVEM V5 to try to install the Remora firmware,
but when I opened the case I noticed that the chip is not an STM32F207 but the one in the photo


 


is it still compatible or did I buy the wrong card?

Thanks if you can give me some advice

P.S. sorry Scotta
I went a bit back with the posts and at 191 there is the answer to my question, thanks,
I'll move on....

Hello,

Now with the Mesa 7i96 there are more inputs and outputs to play with, compared to the old controller.

The machine has a (diy) mechanical spindle lock. It just slides on the wrench flats of the spindle.
The limit swicht for lock was previously connected to the E-stop in series, which is not the best way.
Now I connected the switch for the spindle lock to an input. in the hal file I connected that input to a pin called drive inhibit.

I cannot start the spindle drive when the switch is actuated and the spindle is locked. So far so good.

Now I tired to find some info how to get the Axis GUI to "disable the spindle buttons", maybe even some indicator on the GUI "spindle is locked" would be nice. And in ideal conditions I would not be able to run an automatic program.

If the spindle brake checkbox would be used it would be O.K. as well, but then I need to disable the automatic unchecking of the spindle brake, because the lock is manually operated.



 

Actually it's my issue for not checking the boot logs, the scripts setup the zram.service. Whether Raspberry OS uses zram is not related to our images, as we use Debian.....as of course you know.
The zram.service is part of the image builder, I've modified the process so the service shouldn't be enabled and later on install systemd-zram-generator and create a config that will use 1GB on a 4GB system, this can be modified if required.
As you can see zram tools are installed, this is whether or not systemd-zram-tools are installed.
The issue is because Bookworm uses systemd the package systemd-zram-generator is required, this is the missing piece of the puzzle. During the build the a different script is used to zram0 which fails.

As you can see from below zram0 is used for swap.
Without the mods I've describe above there is no swap. Whether it's need or not, but on a typical debian x86_64 install usually a 1GB swap partition is created.

As you can see it really doesn't affect the total free memory when it's not in use.And BTW it not caching memory nor mamory glands, but is creating a swap partition that is compressed in memory.

The simplest option is just to mark zram.service as masked and have no swap.

So at the moment I'm building an image with the mods.....and make sure I've done it right.

Rob

I have been stalled on this for quite some time. It's difficult work. Keep routing me on from time to time.

 
For the needs of my workshop, I built this plasma table.
The usable cutting area is 2790x1200mm, and it is equipped with a Hypertherm Powermax 105 SYNC, allowing cuts up to 32mm of steel.
I initially used the control unit from my CNC milling machine along with Mach3, but I was very limited in terms of available options.
 recently upgraded it to fully utilize all the possibilities of LinuxCNC/QtPlasmaC.

This is the V2, I will start the V3 soon with a complete rebuild and complete new mecanical design

Here are some photos:

 
 
 

Yesterday's job, 15mm steel: