microswitch repeatability

Jon
A number of years ago I was amazed to see a boring mill with an automatic
homing cycle on the measuring rods lying in a rod trough. It used a
standard leaf actuated micro-switch. I checked it with a micro-cator and
found it repeated within a few "tenths". I checked a few other
micro-switches chosen at random and was surprised again to find that they
all repeated under a thousandth, most within 2 to 3 "tenths". (A tenth in a
machine shop refers to a ten thousandth of an inch. I think the probe
would work as long as that repeatability is close enough and the probe is
lowered reasonably slowly enough.