Variable Speed – Adjustable Pulleys

Also known as: Hand Adjustable Pulleys, Stationary Adjustable Pulleys, Variable Pitch Pulleys, Adjustable Pitch Pulleys, Variable Speed Pulleys.

These adjustable pulleys are ideal for low power applications when a small variation in speed may be required or the drive needs to be trimmed after installation.

Adjustable pulleys consist of two parts, a fixed half that is secured to the motor shaft, and an adjustable half. The fixed half has a finely threaded boss onto which the adjustable half is mounted. Adjustments are made by screwing the adjustable half towards or away from the fixed half, effectively changing the pitch diameter of the pulley. Adjustment may be made in increments of one quarter of a turn. When at the desired setting the movable half is locked into position with a set screw which must be aligned with a slot in the boss to prevent damage to the threads.