A disc type grinder, designed for grinding material to produce a fine mesh sample in one operation. It is a self contained grinder furnished with a rotating disc having a planetary movement in a vertical plane. This feature gives added life to the wearing parts and delivers a product to uniform fineness. The pulverizer will reduce 1 pounds sample of quartz type material to 100 mesh in 1 minute. Maximum feed size is 1/4 inch Grinding is done between two discs, one of which is stationary and the other revolving eccentrically at high speed. The apparatus is supplied with heat treated disc of 7 inches in diameter Adjustment for size of product may be made by use of a convenient hand wheel while the machine is in operation or at rest. A self locking device holds the hinged grinding chamber in place and affords easy and quick access to the grinding chamber for removal of ground samples and for cleaning The pulverizer is supplied complete with a 3 H.P. motor, starting switch, V-belt puly drive and mounting. Electrical requirements are 440 volts, 3 phase A.C. Disc diameter: 175mm.Maximum feed size: 8 mm (approx) Size of finished Product:100 mesh to 150 mesh.