DoN. Nichols wrote:
....
I would suggest either a logarithmic taper pot (so you can make
very fine adjustments at slow speeds and coarser but quicker ones at
high speeds. ...

Ah ... good point!

A tach generator is what your really want for very slow speeds.

You could use an encoder with a circuit to produce a voltage
proportional to the pulse rate, but that would probably make your speed
bumpy at the low end.

OK - definitely don't want bumpy at the low end (finish cuts).

Thanks,
Bob
--
Nota for President