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You should read Gary's PDF on grounding and follow those instructions. Not having the frame of your machine grounded is just asking for problems.

The problem with grounding and static is that static is extremely high voltage with very little amperage. It's very easy for electrons to leak all over the place and when they leak into the...

I agree. Ground EVERYTHING that moves to the same grounding rod. That includes the X axis, Y and Z cars individually. Ground the DC to the machine. Ground the electrical outlets to the rod....