Z axis autofocus switches?

[Manuelbus]

Wanting to add autofocus to my cutter - I've seen most machines use these tubular switches with really long actuators sticking down beside the lens nozzle - anyone know what they're called or where I can get one? Not the capacitive or inductive ones - actual mechanical switches

[Manuelbus]

Ah, might have a look into those. I could come up with something using a common little momentary push button I suppose.

And yeah, my intentions are to actually have 2 switches, one for autofocus and one as a hard limit. Being powered by screw threads, the bed would probably bend the nozzle off the gantry real easy if it didn't stop!