Volumetric feeder machines each come with a hopper, vibratory feeder, and control unit, eliminating the hassle of buying these components separately. The hopper holds dry materials such as powders, flour, sand, or coal that will be dispensed onto the feeder, and it can be removed and cleaned when needed. The feeder uses vibration to move the dispensed material at a consistent, controlled speed and volume into other processes or conveying systems. The control unit can be used to vary the amplitude (stroke size) of the vibratory feeder in order to change the rate that material flows from the feeder. Volumetric feeder machines are ideal for precision small-batch bulk packaging, weighing, and feeding operations.

Vibratory feeders each come with a vibratory feeder unit, an electromagnetic drive system, and a tray or trough for moving bulk dry materials such as powders, flour, sand, or coal from a storage vessel such as a hopper into other processes or conveying systems. The feeders are powered by electromagnetic drives, and they create vibration that conveys material in the trough at a consistent, controlled speed and volume. The unit has a fixed vibration frequency, but a compatible control unit can be used to alter the amplitude (stroke size) of the vibration in order to change the rate that materials flow through the feeder.

Control units can be used with compatible vibratory feeders to alter the amplitude (stroke size) of the feeders' vibration in order to change the rate that materials flow through the feeders and into other processes or conveying systems. They also turn the feeders on or off.