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Might have better luck with this in the Debian forums, it is Linux related.

Yet another Flexgui Op. This time we tackled single point thread milling.

What settings are you using for the G251X? I have been trying to tune them with no success. The motors are very loud and produce a lot of vibration, especially at low speeds. Using generic Chinese drives with the same hal (minor tweak to the stepper scale) produces significantly less noise and vibration.

First make sure the scaling is correct for all axis, then check for backlash or loose screws or mounts.
Also check for mount deflection while machine is working.

Reading hal pins in gcode is tricky as you need to sync the interpreter to update the values:
linuxcnc.org/docs/stable/html/gcode/over...gcode:ini-hal-params

Try this:

Hi Collins,

It's far from linuxcnc compatible.
The hal works different and the rtapi works different.

The code is entirely different. The realtime approach is the same.

It would be about the same, but you would likely need to add 
some additional I/O cards for general purpose inputs and outputs.
(that are built in on the the 7I95T)