horse power = torque (ft lbs) * speed (rpm) / 5240
5 rpm at 20 ft lbs comes to .019 hp.
www.mpja.com has all sorts of small motors; most are rated by output speed
and voltage which gives no idea of power. But a few show amperage also.
You might buy one or two of the motors that looked close and some
resisters to place in series with them to convert to a "fixed" torque
motor, ie fixed current rather than fixed voltage.

The motors probably wouldn't last long but the education would be quick
and cheap.

Hul

fired this volley in :

The motors probably wouldn't last long but the education would be quick
and cheap.


ACtually... I have a couple of Ampex tape spool motors rated at 30VDC 6.5A.

It'll take some time in the machine shop to adapt them (they won't take the
overhung weight necessary on the main belting run) not because of the
fundamental difficulty of doing it, but because of real estate limitations
in the machine.

LLoyd