Auto-Level Probe Problems

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.

The spindle is connected through all of the bearings to ground. Can you connect the top of the PCB to the probe input?

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Good idea. I had to isolate the PCB board from ground by putting some nylon washer between the board and bolts, but it worked great. Thanks Rob!

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