Bob:
Imagine turning on a machine which has a tool sitting in the middle of the
bed. If you have home switches, you can say "ref axis" and the axis will
move to home and then zero the DRO's. Or it can put any amount in the DRO's.
So if the switch is 2 inches away from limit, the DRO's can then be
programmed to read 2".
Its a handy way to make sure that 0,0,0 today is the same as every other
day. The switches do not need to be great, once hit, the axis moves off the
switch before zeroing. You can share the limits with this on some systems.
Hope this helps,
Art
www.artofcnc.ca
