The Feed Control fits on the Cyclone Sample Mill (all versions).
The 220 volt version is available with a geared motor and an output shaft turning an auger at 42 RPMs.
Sample material is fed into the hopper and dispensed into the mill grinding chamber at a controlled rate.
This controlled rate provides a smoother grind and consistance partical size.
The above is a representation of the circuit wiring and components. (not for commercial use.)