Abstract: An abrasion apparatus having a freely rotatable platen, an application block to which a workpiece is applied, and at least one pressing plate to press the workpiece on the platen with the application block being located therebetween. A working face of the platen is corrected by providing the pressing plate with a retaining ring to which the application block is fitted, which also serves as a dresser, and by pressing the retaining ring on the platen when the application block has been removed.

Abstract: Described herein is an edge polisher for polishing chamfered edge portions on the front and rear sides of work, including a first machining stage for polishing the front side of work and a second machining stage for polishing the rear side of work, along with mechanisms for supplying, positioning, transferring, reversing and ejecting work. In the first and second machining stages, a work is chucked on each of index units which are mounted on an intermittently rotating index table and revolved around a polishing drum located at the center of the index table, pressing chamfered edge portions of the works against the polishing drum to give a polishing treatment thereto.