I'm trying to mill out some PCB's and wanted to do some auto leveling to make things more exact. I've tried using Chilipeppr and OpenCNCPilot, but the problem is when I connect one wire to the board (ground) and the other to the bit it makes a connection already. The spindle is grounded. Is it suppose to be?
How would I be able to do this auto leveling probing? The only thing I can think of now is to make the bit itself non-conductive by coating it with something.
Any help is appreciated.