Band Organ Crankshaft Speed
By Fritz Gellerman
My North Tonawanda Model 188 had a gearmotor installed when I got it.
The organ is more or less equivalent to a Wurlitzer 146 and has the
Wurlitzer duplex roll mechanism installed. I presume the crankshaft
speeds would be the same.
The gearmotor develops 1/2 hp and runs at 90 rpm. This would appear to
be the ideal crankshaft speed, but the 1/2 hp motor had marginal torque
so I reduced the speed to about 75 rpm with pulleys. There was still
enough adjustment left in the roll drive mechanism to run the rolls at
the right speed. If I was buying a new motor I would get a 3/4 hp 90 rpm
gearmotor and use a 1:1 pulley ratio.
(Message sent Tue 29 Apr 1997, 14:11:45 GMT, from time zone GMT-0400.)