since we are sharing and many of us are simple please 'splain why a lathe needs such a sophisticated control.
doesnt he gear box/ belt pulley control the speed adequately?
or do you need the rpms exact for some work?
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Just more control. The belts on my lathe are a bit of a pain. It started because my motor blew bearings, and I have a problem needing to constantly make things better. That's the majority of what goes on in my shop. Changing things, adding systems, making things needlessly more complicated for my own personal enjoyment.
I have a tach, an ammeter display, voltage display, variable speed, push button start/stop and direction change. I needed to change the setup because things for a bit messy from adding bells and whistles.
I'd like to do the same thing to my mill too.