I'm needing a sensor to mark the exact same spot on the lathe spindle once per turn. Its used for threading as the index mark. My control vendor, Camsoft, recommends a rocker switch and cam type arrangement. It would be just like the old fashioned points in a gasoline engine.
I thought of just using engine points, but I don't think they'd last long in a lathe. And running backward would probably break them.
I'm not finding a part like this. Any suggestions?