New 18-inch-diameter Centrifugal Impact Mill Model CIM-18-SS provides coarse to fine (400 mesh) grinding of friable materials into controlled particle sizes, as well as de-agglomerating and conditioning of dry solids. A direct drive system reduces the unit''s footprint to about half of that required by a belt-driven machine, allowing installations in restricted areas. High-speed rotation of the inner disc creates centrifugal force that accelerates bulk material entering the central inlet of the opposing stationary disc. As material travels from the center to the periphery of the discs at high speed, it passes through a treacherous path of five intermeshing rows of rotating and stationary pins, with the desired tight particle size distribution obtained by controlling the rotor speed. Setting the infinitely variable rotor speed between several hundred rpm and 5400 rpm provides the flexibility to use the machine for coarse grinding and de-agglomerating as well as for fine grinding.