choosing proximity sensors?

[the great waldo]

With proximity sensors you could use two switches in series, one sensing axis position directly and the second sensing a cam on the rotating screw - instant multiplication of homing resolution ;-)

Hi Magicniner

Any chance of explaining the cam on the rotating screw (picture/sketch for a dummy might be helpful) If it's too much hassle don't worry, but I am curious.

Cheers
Andrew