RE: [CAD_CAM_EDM_DRO] Home switches.

The software would have to be pretty quick on the draw to catch that
index pulse. Unless you read the limit switch, stop on state change, and
then slowly reverse until index pulse is seen. -OR- Stop on limit switch
state change, slowly rev until limit switch releases, then very slowly fwd
until index pulse is seen.
I prefer the later because it guarantees that you will always detect
correct index pulse because, you're always approaching the index pulse in
the same direction, plus you don't have to worry about index/limit deadband
(hysteresis, with no etymological link to hysterical for those women reading
the list) if you take the motor encoder apart.
Note: that the limit switch range could be several encoder rotations
wide.

Jack
www.lonestarobservatory.org