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This maybe of help
linuxcnc.org/docs/html/man/man1/linuxcncrsh.1.html

This one may have you going through the docs
linuxcnc.org/docs/html/man/man1/linuxcncsvr.1.html

Pinium it

For axis cal look at this. www.renishaw.com/en/axiset-check-up--11353

Renishaw has some nice software for calibration on multi axis machines. I have not seen anything for Linuxcnc only Fanuc and Siemens. They do provide source files.

I figured out the problem and I'll post it in case anyone else runs into something similar.

TL&DR: It was working all along, but the +/- increments were so small and that the set speed was always less than the minimum. If I clicked + enough times, I would eventually get it past the min and the spindle would speed up.

The longer version is that on a whim, I ran the default "LinuxCNC" carve program, and surprisingly, the speed ramped right up to 10000 RPM (not the minimum 6000). So, that told me that the speed was actually under CNC software control. The I enabled the spindle manually from the GUI and just kept clicking + until the spindle passed the min. The LED display on the VFD tracked the GUI as well.

So, a frustrating few nights of debugging, but I learned a lot about how this thing works under the hood!

maximuim travel in X and Y while probing before error.
maximuim travel in Z while probing before error.

No joy.

I can't unhome a joint via hal commands, or at least not how I've got it set up currently.

Attempted an M-code bash file with:
And am getting a "must be in joint mode or disabled to unhome" error.

Any idea how to disable or switch to joint mode for a single axis, either in HAL or with a bash file?

Thanks a lot andypugh!! Great Help!!
I am trying to instead of manually type the instructions (Commands + units to move each one of the axis) or read them from a file, to automatically receive that data from an other application written in C. So i should add in the CNC panel a button to select or deselect "automatic data transmission (Commands + units) towards the axis, that should switch from receiving the data through the textbox "Enter the MDI Commands" to a kind of transmission connection that automatically would receive the data. It would be of great help to find out, where is the code for the function of the "Go" button.
Thanks a lot for the help.