Earthing?

[Edward]

Thank you Dean, for the clear advice and for the warning about the transformer! I've learned so much from this forum.

A metal enclosure it will be, more expensive, but worth it.

I think I will try the cheapo prox sensors first, as I am more interested in them acting as limit switches, at least at this stage. I'll keep you posted.

Oh, a last question unrelated to this. What is the average or expected backlash on bog standard ballscrews C7, chinese. My backlash is between 0.045mm and 0.054mm for each axis, i.e. including the bearings, etc. Is that reasonable?

Edward