Patent ID: 7874897

Claim:
A polishing system for polishing a flat workpiece, the workpiece comprising a plurality of flat items having at least one flat surface, the flat items cemented together with a cementing material to form a casting having at least one flat surface formed of the at least one flat surface of the plurality of flat items; the system comprising a polishing pan comprising a circular, flexible bottom portion, the bottom portion lined with at least one resilient material; the pan further comprising a vertical peripheral wall attached to and surrounding the bottom portion, and means for polishing the workpiece contained in the pan, and contacting the bottom portion and an interior surface of the vertical peripheral wall; a base having an upper flat surface, the base further comprising means to raise and lower the center of the bottom of the pan; the base comprising means to provide separate elevated areas in the bottom of the pan; means to mount the polishing pan on the base means to provide circulation of the workpiece; and means to provide rotation of the workpiece.