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Motor Sizing

From the 1936 "Delta 6" Belt Sander" publication Delta 6 inch Belt Sander: "It is inadvisable to install less than a 1/2 h.p. motor in a unit of this size, and a 3/4 h.p. motor with double V-belt drive should be employed if very heavy sanding is to be done. Only a constant speed, repulsion-induction motor should be used." With the quality of modern V-belts, a single belt drive should be sufficient. Earlier motor horsepower ratings were more conservative than today, especially for repulsion-induction motors. Late model sanders were supplied with a 1.5 hp induction motor.Delta 6x48 belt sander motor size

See also updated & considerably-revised 1944 publication:
PM-1514. 6 inch Abrasive Belt Finishing Machine Operating and Maintenance Instructions



Pulley Sizing

From the 1936 "Delta 6" Belt Sander" publication Delta 6 inch Belt Sander: "With a 1725 r.p.m. motor, the pulley recommendations are 5 in. for the motor and 4 in. for the sander, giving a belt speed on 3100 feet per minute. This is a good all-around average for general work, and is as fast as the belt can be operated for woodworking without glazing or burning." For a 3450 rpm motor, simple math suggests a 2-1/2" pulley however the 1985 parts list calls for a 2-3/4" pulley. 6x48 sander gearing? Quick question! Alternatively, the band saw calculator may be used with Band Wheel Dia. set to 5.5 in. You are looking for a SFPM of 3,100.

See also updated & considerably-revised 1944 publication:
PM-1514. 6 inch Abrasive Belt Finishing Machine Operating and Maintenance Instructions

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