Quote Originally Posted by routercnc View Post
Can anyone tell me which of these options is required - I was expecting to get the switch pretty close mechanically and then fine tune the amount of back-off in software to get it dead on.
Take the time to Get it dead on to start with then you won't have to is the best option.!! . .. . .Then if any adjustments are needed at all your into fractions of millimeters and so just tweaking the switch is plenty.

Proximity switches are great for this has you have adjustment via the threads on the switch and altering the sensing distance if needed has well as any lateral adjustment you build into the switch.