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Recorded the voltage between tip and work piece during some 5 minutes. Was cutting a bunch of small holes.
 

They all look like this one, with some variation.
 

This was on a dry work piece. There is a clear voltage drop, somewhat slow, delayed recovery.
Triggered contact condition was a one-cycle voltage drop of 5 Volts.

 

Quick Update.

Using "Trixie" branch from here; salsa.debian.org/live-team/live-build/-/...rixie?ref_type=heads

I built a live-build package on a machine running Bookworm from the above repo. Installed the built package and was able to successfully build a Linuxcnc ISO without the raspi-firmware. As noted above hostmot2 firmwares are installed, a test run of Axis with the default gcode produced no errors, apart from latency due to being run in a virtual machine.

Building live-build packages from the above sources also works for building ISO on Linux Mint 22.1 Xia.

The goal would be to pin Linuxcnc to 2.9.4 during the ISO creation, as there seems to be a few issues reported by users with either the 2.9.5 or 2.9.6 branch.

try changing

to

Might be related to this:
github.com/LinuxCNC/linuxcnc/issues/3583

I tried to do it correctly so I wired them as normally closed. I have 2 limit switches on the axis and this one is also my home switch. 
If I follow your advice then I need to revert everything to have the other LS as HS. This is not an issue to be honest, just thinking about the consequences. 

Thank you Peter.  I reviewed the link you provided, but is there a document or manual which describes how to set this up?

That indicates a Ethernet latency issue.

What does the command

sudo chrt 99 ping -i .001 -q -c 60000 192.168.1.121

report?

(the command will run for one minute then print statistics)
 

When I move the engines after a while, I get this error. 

I can't figure out what the problem is. The connection seems to be fine.

I installed both versions 2.9.5 and 2.9.6 and both have the same problem with the parallel port. I have an MPG configured with a C10 and in version 2.9.4 it works perfectly, but in either of these last two versions it doesn't. When running LCN you can see with the hal that the parallel port is indeed loaded on the pins, but none of the functions programmed in the MPG work. I went back to 2.9.4 and the MPG works again.

Thanks to each for reply's...Going to get back to that in a day or so so will likely struggle a bit...but that is the way it works!

LinuxCNC can do all that, and much more, but it is much better to use a micro controller for that task, usually PLC, but you can make your own PLC just search for "arduino PLC" or "ESP32 PLC" .

@LangdonS,
what are you replying to ?
And might i add: why?
Edit,
OK i found it.

There's an example of an electronic gearbox for a lathe, no gcode, just a custom GUI and some HAL connections.

Probably not a lot that you can use, but an example of what you can do.

My guess would be as long as you can get the data into linuxcnc and output any control values based on the input you should be fine. This would probably require some custom HAL written components to operate on the data and apply the output required. Oh yeah and maybe a gui.

The absolute simplest example I can think of is the parallel port tester, doesn't have any kinematics, but does allow you to control outputs and read the state of inputs.

Just throwing this out there.
MRO is another example. Maybe this could be a starting point, just start be reading data and displaying it, once you have that nailed, you could start with some simple HAL components to manipulate your data.
linuxcnc.org/docs/html/gui/mdro.html

Not an exact implementation but kind a simple example of what is achievable.

No doubt Andy will have a better idea and contradict everything Ive said, as he's way way more knowledgeable.

2.9.4 and Wheezy now accessible via:
www3.langdonstaab.ca/LinuxCNC/
www3.langdonstaab.ca/LinuxCNC/iso/
and
www3.langdonstaab.ca/iso/

Random Ubuntu Server question:
Why does the du command show the symbolic link (created via ln) as occupying space and not the actual file?
Really strange.

I deleted all other files.

(And fixed the directory structure!)

Now it's just wheezy and 2.9.4.