Zero-Max drives may be connected to any rotating power source up to 2000 RPM. Adjustable speed drive speed adjustments are easily made by moving a lever control through an arc or turning the hand-wheel of a screw type control. In either case, easy and precise speed control settings are possible with Zero-Max adjustable speed drives - also referred to interchangeably as variable speed drives.
Externally, the Adjustable Speed Drive consists of a rugged, sealed cast case, an input shaft, output shaft and adjustable speed control. Speed of the output shaft is regulated precisely and easily through a control lever which includes a convenient locking mechanism to hold speed at a desired speed setting. .
The general principle of operation of Adjustable Speed Drives gives infinitely variable and adjustable speed by changing
the distance that four or more one-way clutches rotate the output shaft when they move back and forth successively.