Hall effect proximity sensors

[magicniner]

I presume these would have to be the Normally Open types. I think it is over the top for woodwork, but probably OK for watchmaking.

Series for NO, so the circuit only closes when both close.
Parallel for NC, so the circuit only opens when both open.
:D

I'm planning this with my Chester Mill CNC conversion, I've become accustomed to being able to shut down my X7 and know there will be no positional errors when I turn it on the next day, select the WCS and slot a part into a fixture, I can't imagine going back to having to indicate every time I fire a machine up, I don't think a homing system which requires you to re-indicate a fixture which hasn't been moved is acceptable, in fact I think that's the definition of Useless.