The barred and spiked feed roller is placed off centre across the disc and is driven by a 5 HP geared motor through duplex sprockets and chain. The roller is pneumatically loaded by means of an air cylinder which allows the roller to lift if tramp metal is encountered. The cylinder which loads the roller, will, by simply moving the valve lever, lift the roller to clear out any obstruction.
Ball and roller bearings are fitted throughout.
The primary clay cutter prosesses average clay and shale of "as won"
dimensions, at the rate of up to 50 tons per hour, reducing the material
to ½" (12.7mm) size.