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rodw wrote:

Couldn't help myself and posted at Phoronix...

Could not find it there, or using different nic?

Moved to "ethercat" section.

Usually, cutting to slow or lack of air pressure.

Blender is a monstrosity and a magnificent piece of software, so yes, it is always worth the time and effort to learn it, not only for CNC.

Sorry took a while but I did hook up a scope to a highdef plasma with HF start. Measurements taken directly between electrode and work from the 50:1 output.
I could not capture kerf crossing that well as the change in voltage was so slow and my portable scope is what it is... Closest thing to kerf crossing was running out of plate and that I could capture so I did that.
How I see from these scope captures is pretty much as I though. You can see from both 50A and 100A pierce that during pilot the voltage hits a "ceiling" that is the OCV, then drops when it transfers to plate. Then when you run out of the plate it looks to me that the voltage hits a "ceiling" that is the max DC output of the plasma, 50A and 100A look very similar.
I dont have a current probe, now at least, so I can't capture the current ramp up but in the highdef stuff I would assume this is measure in some hundreds of ms instead of ns again I cant really prove this as I dont have a current probe.

EDIT: Some typos

I started a build for new CNC plasma table so here's my starting point.

CPU Ryzen 5 6C/12T 3.2Ghz 32G RAM, 550G SSD, Dual Ethernet ports
Ubuntu 24.04.02 - I know it's not "debian" but is what all other machines here run. Compatibility and support are the key deciding factors
PREEMPT-RT installed, Fairly minimal system with snap completely removed.
Stepper Drives (4ea) Stepper Online DM542T - have had excellent results with these in the past
Stepper Motors (4ea) Stepper Online 23HS30-2804S - again have worked well in past
Custom built frame from 2x2 16ga steel tubing. All Linear Rails SBR20. All Ball Screws SFU1605
Motion Controller Mesa Electronics 7i95T & THCAD2 - ordered and expected arrival in next few days
LinuxCNC version 2.10 being built from source.

I can successfully build the rip version without error and it appears to work correctly however as I mentioned I do not have the 7i95T in hand quite yet and it's not listed as an option in the opening config choices.

To get the full package I'm working to compile to get the .deb version and having some make problems.

Problem 1
I get lots of errors during the build of man pages. Some work but many report this error and often multiple times.

Making manpage sampler.9
<unknown>:1: SyntaxWarning: invalid escape sequence '\S'

I suspect this has to do with the fact that Ubuntu 24.04 uses python3.12. I haven't dug into to it but have had many problems in many projects with python version compatibility and this is known issue from 3.11 to 3.12. Any suggestions on how to fix this are welcome and sooner or later it'll have to be addressed anyway.


Problem 2
This is the end summary of the build

Compiling module_helper/module_helper.c
<command-line>: error: "_FORTIFY_SOURCE" redefined [-Werror]
<command-line>: note: this is the location of the previous definition
Compiling localized message catalog ../share/locale/ar/LC_MESSAGES/linuxcnc.mo
Compiling localized message catalog ../share/locale/bg/LC_MESSAGES/linuxcnc.mo
cc1: all warnings being treated as errors
make[2]: *** [Makefile:278: objects/module_helper/module_helper.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory '/home/plasma/Documents/linuxcnc-source-dir/src'
dh_auto_build: error: cd src && make -j12 build-software returned exit code 2
make[1]: *** [debian/rules:55: override_dh_auto_build-arch] Error 2
make[1]: Leaving directory '/home/plasma/Documents/linuxcnc-source-dir'
make: *** [debian/rules:43: build] Error 2
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2

The _FORTIFY_SOURCE error shows up many times as well and probably isn't the only problem.

Again I know it's not debian but Ubuntu is derived from debian and the rip version compiles and works so I've very optimistic once I work out a few kinks this will too.

cc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
Copyright (C) 2023 Free Software Foundation, Inc.

Thanks for any and all suggestions. Mike