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  • tommylight
  • tommylight's Avatar
05 Nov 2025 23:55
Replied by tommylight on topic High frequency ohmic struggles

High frequency ohmic struggles

Category: Plasmac

I think there are much bigger issues than ohmic sensing from what you describe, namely bad wiring/shielding/grounding in general, so my strong advice is:
-do not fire the torch before grounding things properly
-make sure the power socket and the machine are grounded and the shop has proper ground rods
-make sure the PC is grounded
-make sure the plasma source is grounded
-disconnect anything ohmic related from Mesa
-disconnect the THCAD from Mesa
-connect THCAD only to plasma source
-wire and test the new Mesa, make sure everything works properly, wire the Torch ON to plasma source
-power on the plasma source and cnc machine and start QtPlasmaC or PlasmaC or whatever you are using
--enable LinuxCNC, jog around a bit, then use the Torch PULSE on screen set to 1 sec (default) ONLY ONCE !!!!!
-did anything move/burn/make strange noise/screen blank/PC turn off or lock/Mesa reset or lost connection/THCAD smoking ?
If any of those is yes, turn OFF everything and go back to wiring/shielding/grounding (goggle Hypetherm grounding they have a nice general guide)
If all above are no, try the pulse again and again, waiting 5 seconds between, make the pulse time 3 seconds and test several times again
If all that goes OK, try to do some manual cutting (use F9 to probe and fire the torch then jog manually), do several short cuts
If all good, power down and wire the THCAD to Mesa, do the same procedure from the line with two - signs above
ONLY if all tests go without issues proceed to wiring and testing Ohmic sensing. Again test from line with two -
  • tar_san
  • tar_san
05 Nov 2025 23:55
How to set current encoder pos to current position while homing by Driver. was created by tar_san

How to set current encoder pos to current position while homing by Driver.

Category: EtherCAT

I have a problem. (EtherCAT Servo motor  Incremental )

1) while Homing by driver ..
2) begin to move  and then push Emstop.
3) Turn on " Machine Power "
4)  Suddenly servo motor move to the previous position( when I push homing button)  really crazy fast .

I think while homing, Servo driver control the position.

So I believe , While homing, LinuxCNC control position must be set by current servo driver encoder pos.

Please give me a hint to fix this problem.

I'm using ..
LinuxCNC Version 2.9.4
Lichuan LC10E Servo motor (17bit inc) 
CIA402, Custom Homing component
 
  • FPVUALAB
  • FPVUALAB
05 Nov 2025 22:22
Replied by FPVUALAB on topic Bricked Mesa 7i92T

Bricked Mesa 7i92T

Category: Driver Boards

LinuxCNC penultimate version (and possibly 2 versions before that)
Mesaflash 3.5.16 (was updated a little earlier because it did not recognise my board)
  • Hakan
  • Hakan
05 Nov 2025 21:16
Replied by Hakan on topic Trouble with Cia402 drive configuration

Trouble with Cia402 drive configuration

Category: EtherCAT

They are numbered after the network chain. 0 is closest to the master, 1 is next, 2 is nextnext and so on .
Can't change that afaik. Rearrange the network cables if you have to have a certain numbering.

Happy it was so easy this time :)
 
  • PCW
  • PCW's Avatar
05 Nov 2025 21:10
Replied by PCW on topic Bricked Mesa 7i92T

Bricked Mesa 7i92T

Category: Driver Boards

What version of mesaflash and LinuxCNC do you have?

mesaflash --version


To install the latest LinuxCNC version, go to github.com/LinuxCNC/mesaflash
 then scroll to the bottom for "Quickstart" instructions.
  • Hakan
  • Hakan
05 Nov 2025 21:07
Replied by Hakan on topic MonoKrom - QtPyVCP GUI for PlasmaC and Mill

MonoKrom - QtPyVCP GUI for PlasmaC and Mill

Category: QtPyVCP

Okay, I just copied the linuxcnc config directory from monokrom-vcp to my config directory.

Go sim.monokrom/plasma
debian$ linuxcnc xyz.ini
Gives the following, missing module imp which is deprecated when searching for it.
Traceback (most recent call last):
  File "/usr/bin/monokrom_plasma", line 8, in <module>
    sys.exit(main())
             ~~~~^^
  File "/usr/lib/python3/dist-packages/monokrom/plasma/__init__.py", line 8, in main
    monokrom.main('plasma', opts)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/monokrom/__init__.py", line 111, in main
    qtpyvcp.run_vcp(opts, config_file)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/qtpyvcp/__init__.py", line 26, in run_vcp
    run(*args, **kwargs)
    ~~~^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/qtpyvcp/app/__init__.py", line 129, in run
    launch_application(opts, config)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/qtpyvcp/app/launcher.py", line 70, in launch_application
    app = _initialize_object_from_dict(config['application'])
  File "/usr/lib/python3/dist-packages/qtpyvcp/app/launcher.py", line 205, in _initialize_object_from_dict
    obj = _get_object_by_referance(provider)
  File "/usr/lib/python3/dist-packages/qtpyvcp/app/launcher.py", line 193, in _get_object_by_referance
    return getattr(importlib.import_module(modname), attrname)
                   ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/usr/lib/python3.13/importlib/__init__.py", line 88, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 1026, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/usr/lib/python3/dist-packages/qtpyvcp/app/application.py", line 7, in <module>
    import imp
ModuleNotFoundError: No module named 'imp'
  • bentiggin
  • bentiggin
05 Nov 2025 21:03
Replied by bentiggin on topic High frequency ohmic struggles

High frequency ohmic struggles

Category: Plasmac

There is a yellow blinking light. I'll try to see if I can measure anything on 1x with my multimeter.
Thanks for all your help and the awesome mesa products.

On another forum, I saw the os3t-01 from robot3t.com. It's an ohmic sensor that can supposedly handle hf.
Does anyone have any experience with this company or their products?
  • FPVUALAB
  • FPVUALAB
05 Nov 2025 20:59
Replied by FPVUALAB on topic Bricked Mesa 7i92T

Bricked Mesa 7i92T

Category: Driver Boards

Hello! Please tell me how to update Mesaflash to the latest version and why it is missing in the latest version of LinuxCNC? Also, please tell me which firmware version I need to flash the board to get 4 axes with 4 encoders? Thank you very much!
  • peterpan
  • peterpan
05 Nov 2025 20:52
Replied by peterpan on topic Trouble with Cia402 drive configuration

Trouble with Cia402 drive configuration

Category: EtherCAT

You are completely correct. Do you have a clue as to why slave 3 switched to slave 0, and is there a way to force the order?
  • Hakan
  • Hakan
05 Nov 2025 20:40
Replied by Hakan on topic MonoKrom - QtPyVCP GUI for PlasmaC and Mill

MonoKrom - QtPyVCP GUI for PlasmaC and Mill

Category: QtPyVCP

I few of the dependencies were missing. 
debian@plasma:~$ monokrom_plasma --install
Traceback (most recent call last):
  File "/usr/bin/monokrom_plasma", line 8, in <module>
    sys.exit(main())
             ~~~~^^
  File "/usr/lib/python3/dist-packages/monokrom/plasma/__init__.py", line 8, in main
    monokrom.main('plasma', opts)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/monokrom/__init__.py", line 104, in main
    copy_tree(src, os.path.expanduser('~/linuxcnc'), update=1)
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/setuptools/_distutils/dir_util.py", line 127, in copy_tree
    raise DistutilsFileError(f"cannot copy tree '{src}': not a directory")
distutils.errors.DistutilsFileError: cannot copy tree '/home/debian/.local/share/monokrom/linuxcnc': not a directory

I hope the --install is the next step.

 
  • PCW
  • PCW's Avatar
05 Nov 2025 20:26
Replied by PCW on topic High frequency ohmic struggles

High frequency ohmic struggles

Category: Plasmac

Do you have a blinking yellow light on the THCAD?

If you set  the THCAD frequency divider to 1X you can probably
measure a change in the frequency as a voltage change on the F+
or F- relative to ground. Not sure of the polarity but full scale
should be about 2.5V at full scale and maybe 0.3V at 0V

I would need to study a bit about the probe wiring.
 
  • Gogonfa
  • Gogonfa
05 Nov 2025 20:05
Replied by Gogonfa on topic Help with Wireless Handwheel XHC-WHB04B-6 (wrong Product ID)

Help with Wireless Handwheel XHC-WHB04B-6 (wrong Product ID)

Category: General LinuxCNC Questions

Thanks @rodw,
today I built LinuxCNC 2.10-pre directly from the git repository, using the 6.12.48+deb13-rt-amd64 real-time kernel together with the Probe Basic GUI.Getting Probe Basic up and running was a bit tricky — some of the Python libraries it relies on are deprecated and no longer available in Python 3.13, so I had to make a few adjustments. But it’s working now!I also changed the ID for the wireless handwheel (not yet tested), and EtherCAT is running as well.
  • bentiggin
  • bentiggin
05 Nov 2025 19:51
Replied by bentiggin on topic High frequency ohmic struggles

High frequency ohmic struggles

Category: Plasmac

Since replacing the 7i97t, I haven't had any of the ohmic wired up while the plasma is running. I have only tried to get it working with the plasma off, so the 7i97t encoders should be fine.
I was more referring to the thcad output.
Can measure voltage between f+ and f- with the ohmic circuit open and again with it closed to test the thcad?

For the capacitor you mentioned, would I wire the torch tip to capacitor and the other end of the capacitor to star ground. Then run a separate wire from torch tip to thcad? Or would I wire both the star ground and the thcad to the capacitor?
  • MaHa
  • MaHa
05 Nov 2025 19:47
Flex GUI - Axis Position Labels was created by MaHa

Flex GUI - Axis Position Labels

Category: Flex GUI

A question about Axis Position Labels. It says labels including all offsets. In 'dro_lb_z' G43 / G49 has no effect
  • Sandro
  • Sandro
05 Nov 2025 19:37
Replied by Sandro on topic MonoKrom - QtPyVCP GUI for PlasmaC and Mill

MonoKrom - QtPyVCP GUI for PlasmaC and Mill

Category: QtPyVCP

And remove the [url= or [/url] from the sources. I don't know what is going on with this editor.
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