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This card is not putting out any voltage to correct the position commanded vs position actual.. i think i might have a bad one

Homing my greatest bugbear. I simply can't get my head around this one.
I wish to have my new machine home X axis and Z axis using one pin IE pin 11
and the two Y axes  on pin 12.
I would prefer to have the Z axis home before the X.
The 2 Y axes should home together in whichever drive arrives first.
I have tried a number of things but have reverted to this setup.
Any help would be greatly appreciated.
Cheers Paul

The feature size is still well above a nanometer, but the edge precision and positioning precision have been well below a nanometer for many years.

The numbers quoted for various generations, such as TSMC's 4 nm are pure fiction; merely a label. Real dimensions have not been used as generation names for more than 20 years.

(I spent my career in state-of-the-art lithography. Now I use LinuxCNC to build model steam engines.)

Gene

Every reference to PINxx should be GPIOxx, which you see by reading the docs for hal_gpio.
If you need to use GPIO7 and GPIO8 you will need to disable SPI in /boot/broadcom/config.txt.
Also you may have to play around with the base thread to prevent rt errors.

linuxcnc.org/docs/devel/html/drivers/hal_gpio.html

Also loudly complain to byte2bot.

In the RPi sticky there is some info regarding hal_gpio and one or 2 other threads with working examples, not directly related to byte2bot but enough to see how it should work.

The Devs and other community members put hard work into the docs.

That correct, when LCNC faults the enable is removed and the drives are disabled. The servo drift stops.

I might be wrong, but i have a feeling you did no go through the post me and PCW linked to.
The motors should ABSOLUTELY be under LinuxCNC control, so when a fault occurs, NOTHING should move.

Electrical panel latest.

 

That is below "Extreme Ultra Violet" with it's 13nm wave length.
What is the current TSMC node, 4nm ???

Thank you for the response.  Here are the hal&ini file.

I checked all the wiring(factory made from Anilam) the encoder are counting correctly. I checked the voltage going to the drive with my Fluke 289 and i get -10mv constant. When I hit the job button it goes from 10 to 11 to 12 and then faults out on following error. The servos just keep drifting. I have hooked up my power supply and varied the voltage to the drive and they respond accordingly. Is it possible my Mesa card is faulty?

Wow so you're aiming for sub lithographic accuracy, you got any pictures of your machine ?
How you handling temperature, a dedicated controlled room ?
I guess this is a retro fit ?

Any voltmeter should do.
 

So i set the P to 20 and still no output when i try to jog, Is there a way I can see what the output voltage going to the drives is?

Some things do not add up here, but most of the discussion is OK in general, so i did not reply till now.
As for the "Copper tip is electrically connected to the work piece", most probably you are both right, as that would have to be connected to something (even work) for it to be able to strike an arc, but also most probably it will have to be disconnected as soon as the cutting current is engaged, otherwise it would just eat through the tip that is copper and would be a puddle in under 1 second, as RDA said it will take the path of least resistance.
All this is perfectly explained in HyperTherm documentation for blow back start plasma sources, service manuals, if you can find them as they showed those behind a paywall lately.
Sorry, but i do not recall the exact procedure and inner workings, it's been 8 years since i read that.
-
As forUnusual = yes for sure, but possible as almost all my machines have a separate cutting table that is not grounded as there is no need for it since the electronics and the surrounding machine frame are all grounded properly, so despite that table acting as a huge antenna, no issues with interference at all. And some are grounded through the plasma source clamp, hence avoiding ground loops.
But, and this is a big but:
Ground everything, properly, in star formation, avoid at all cost "ground loops", use good shielded cable, that will get rid of 90% of issues, and ground the cutting table if the plasma source has no connection between PE and clamp.