The functioning of a de-stoner is based on the property of bulk density of materials, which is key to the separation of impurities from cereals, grains, pulses, and spices. By adjusting the air-flow on the deck, stones and other heavy materials get separated and sink to the bottom. A blower attached to the aspirator enables dust and light-weight particles to be collected in a dedicated bin

In the bi-mill there is an adjustable cam at the bottom of the motor frame. This allows replacing the belt on this device easy.