Great Wester Manufacturing

"HS" Drives

Front open on in-line pneumatic sifter

The Great Western HS drive mechanism is unique in combining gravity and centrifugal force to provide stable start-ups and shut-downs. The uncomplicated adjustment of weights provides the wide range of speed-throw combinations required for optimum operation to meet your product separations.

As the sifter starts, the radial centrifugal force is used to lift the two weight compartments up and together through accurately machined cams while compressing a spring. This controlled energy assures a smooth gyratory motion.

The drive, motor, and counter-weight assembly solidly connects to the two boxes. This lightweight, well proven design combines the three elements into one structure capable of withstanding the dynamic stresses required for years of continuous operation

HS Drive Animation


Automatic Sieve Compression
Gyratory motion

Our horizontal gyratory motion is gentle. It reduces product degradation and is superior to designs using vibratory or centrifugal action.

Automatic Sieve Compression
Vibratory motion

Vibratory designs bounce materials vertically which shortens the time they are in contact with the screen and reduces efficiency. Oversized elongated particles pass through the screen when they are upended impairing separation quality.

Sanitary Frame Construction
Centrifugal sifters

Our gentle gyratory sifting action is less severe than centrifugal sifters. Separation of near sized particles is more precise and the risk of fracturing oversize impurities and forcing them through the screen is diminished



Continuous Innovation in Product Protection & Production Sifters Since 1858!