Does LinuxCNC support spatial PSO, XY axis checkerboard correction functions?

Any links to any of those functions and what they should do ?

It certainly _could_. I don't think that there is an out-of-the-box solution but a simple HAL component could generate XYZ corrections to be applied via external offsets.

The HAL component is fairly simple, conceptually. Getting the required correction base data into it rather less so. It would probably require a user-space helper component to load the data from a file. (realtime components have no access to the filesystem)

andypugh wrote:

 (realtime components have no access to the filesystem)

This may not be true: stackoverflow.com/questions/1184274/read...-linux-kernel-module