How do I set up a limit switch to use to zero a grinding wheel?
Have never done what you are asking. I always dress my grinding wheel before using it ....don't you?
I have a Sanford bench top surface grinder which is totaly manual so you measure as work progress.
It would seem that the tip or high point of the diamond would be a better reference relative to the face / bottom / side of the wheel.
That can be used to trip a switch or whatever. Since you only grind in tenths ( .0001") at a time you will need a very accurate and repeatable
switch. What the surface being ground relative to the wheel or wheel wear rate is as your grinding is another story.
I only remember one thread on a grinding machine trying to use Mach a long time ago.
Someone who does surface grinding at the comercial level can probably be of more assistance.
FWIW,
RICH