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What is the goal here?

Two completely separate CNC machines?
Are you just trying to have 1 computer running 2 machines?

Just buy a 2nd computer. Second hand business machines work fine

Ahh, that may be a master only option for stepconf and not in 2.9.4

If stepconf is standalone (I think it is) you should be able to just use the latest:

 

( rename to stepconf and chmod +x stepconf )

I've done this with a CNC plasma..... It's not too bad from the linuxcnc setup side of things. The hardest part is generating the gcode to do what you want. it's not too bad (programs like a lathe most of the time).


To run the y and a at the same time
G01 y5 a180 f50 that will turn the bar 180 degrees while y travels 5 inches in sync with each other.

What version of LinuxCNC?
Does it have "tandem N axis" as a choice?
Use that if possible, there are no slaves in LinuxCNC.
Just checked and 2.10 has those choices.

Nope, not the same thing, link is to running two programs at the same time, the video is using two Mesa cards that can easily be done by LinuxCNC, as well as any combination of multiple parallel ports, Mesa, EtherCAT.
Would your situation be possible using two PC's and many IO to communicate between them with feed holds and waits and whatever necessary?