Ok guys,
you're either gonna laugh or say hmm, not a bad idea.
I thinking about attempting to make a spinner using
a heavy duty grinder, mounted vertically and a reostat (sp)
for a speed control device.

Section 8, or worth trying?

Most people that have tried this have used washing machine motors off junked machines.  The effort and danger involved makes $200 look pretty cheap.  --  JohnP

I have some success with an electronic power drill - a heavy duty machine with more than 1 hp power, 2 speeds, adjustable torque etc.
I was lucky to find a vertical mount to put it on a sturdy work bench, and made a ball "cup" from scratch to mount it on top. With lowest speed and torque, this works pretty well, although you have to watch out for vibrations when the ball/core is placed out of center line. Tends to become wobbly, a table mounted spinner would be more stable. But for "household" sanding and polish once in a while, it is an option. Only drawback is that I have to keep one hand on the speed lever to keep the drill rotating, while the other hand is needed for the pad and to stabilize the ball a bit.

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