It came with a 3-phase 240V motor which I ran a little with a home-brew
static converter, but I assumed that it would be much easier to sell
quickly (if I find a -good- surface grinder) if it ran on single phase
120VAC so I tried a 1/2 HP Weg TEFC motor on it as a test, and it's
stayed there ever since.

It works pretty well despite all the wear. I use it to put a better
finish on milled parts and to sharpen end mills, taps, reamers, planer
blades, etc, and only rarely to grind large flat surfaces. It did a
nice job of cleaning up that warped air compressor head that was
blowing gaskets.

Jim Wilkins