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Products/Services for Zero Max Variable Speed Gearboxes. 1  Gearboxes and Gearheads - (938 companies) Gearboxes and gearheads, also called gear reducers or speed reducers, are power transmission devices that use a gear arrangement in an enclosed housing to transfer energy, increase torque and reduce speed from one device to another. Gearboxes...
This indicates a gear ratio of 6.7:1, rounded to 7:1. Recall that with a gearhead, torque rises and output shaft speed drops with the gear ratio. You can now size the gearhead to a motor by figuring 66 oz-in. Ã 1.5 (safety factor) = 100 oz-in. of output torque from the gearhead.This gives 100 oz-in./7 = 14 oz-in. from the motor through the gearbox and 37 rpm Ã 7 = 259 rpm from the motor. In this case, the rpm and torque are more than is required.et us take a concrete example of a Baldor Electric Co. dc motor that generates 11,500 rpm with a 1-in.-pitch-diameter pulley. This configuration will produce a linear speed of 36,128 ipm, or 3,011 fpm, or 602 ips. The pulley size, of course, could be changed to vary the speed or torque.