It consists of a grinding chamber with rotor having beaters and grates at the bottom with gap that is dependent on the fineness required.
The fineness is proportionate to the gap of the grates, speed of the rotor and shape of the hammer.
The materials are fed through the "Feed Hopper".
As the rotor rotates at high speed, the materials are crushed into Powder and get discharged through the grates to be collected in a chamber or to a collector.