Hall effect proximity sensors

[johnsattuk]

2 inductive sensors in series on each axis, one sensing the linear position and one sensing a rotating tab or chopper on the ball screw or stepper would give you accurate, repeatable homing.

Generally I don't use N/O types for limit switches, they dont cover broken connections. Could use two N/C in parallel

[Voicecoil]

Generally I don't use N/O types for limit switches, they dont cover broken connections. Could use two N/C in parallel

Equally well, N/C types don't cover short circuits, had a few of those in my time....