Yes I work in millimeters.
Here's what I bought
PM542 Micro Stepping Driver
ZP5A-INT 5 axis breakout board
SPS407 Power supplies 42V
SY60STH88-3008BF High Torque three stack Nema 23, 1.8 degree hybrid stepper motor
I bought a machine from a flower company where there were many of the parts I needed.
My machine runs with Belts and pulleys on the X axis, Y axis and Z axis
Z axis also runs with spindle
X axis of the motor is a T5 25 tooth to a T5 48 teeth on the shaft.
shaft goes forward it to two T10 25 teeth that pull the sled
Y axis of the motor is a 25 tooth T10 to a T10 25 tooth
Z axis of the motor is a T5 15 tooth to a T5 25 teeth on the spindle. The spindle has an increase of 2 millimeters per revolution
Hope this is understandable.
In the cnc Linux, I can see there are several different programs depending on what kind of machine you have. Mine is indeed a plasma cutter, but the only program I can get to work, it is stepconf wizard creates.