[sdiy] Semi OT: Very high repeatability (accuracy) switches?

[Julian]

A little OT, but im looking for a switch that has very high repeatability for my CNC machine, to assist in calibration.

As the origin is set using these switches, i need them to be very accurate as to the ammount of travel before switching.

(of course, very accurate is relative, but more accurate than general every day switches!)

They also need to be quite tough as well, if im not to have to protect them loads.

Anyone got any ideas?

Julian

discalimer: i made the cnc machine, but do engrave for other people - if that's not diy enough for you, please forgive me : )

http://www.thebeast.co.uk/cnc/