Agreed that Fusion 360 is way overkill for a simple facing operation, besides I'd be shocked if Fusion runs on a pi.
bCNC's built in CAM can do a facing operation. It's named "Flatten" in the CAM menu. Or at least that's true for the version of bCNC I'm running.
Another way to do this is with a simple python gcode generator like this:
LINK--->LinuxCNC Documentation Wiki: Simple LinuxCNC G-Code Generators