Abstract: A ball grinding machine for grinding ceramic bearing balls and the method thereto employing a non-rotating upper circular plate and a rotating lower circular plate to perform precision grinding of ceramic balls. The grinding mechanism according to the present invention comprises two or more separate concentric fixed rings, adjacent annular recesses into the lower surface of the upper circular plate, and corresponding two or more concentric hydraulic pressure rings inserted into said recesses, each with a slanted bottom surface towards the adjacent fixed ring for supplying pressure to the ceramic bearing balls on top of the lower circular plate at a sloped angle. The inner surface of the fixed ring, the slanted bottom surface of the pressure ring, and the grinding surface of a diamond grinding wheel installed on top of the rotating lower circular plate together form a grinding track.

Abstract: A reciprocating friction-type mirror finishing machine which has a simple construction and performs easily adjustable feeding mode under micrometer scale is disclosed. This machine includes a driving device for generating a driving force in response to a swing motion thereof, and a friction device connected with the driving device for performing alternately clockwise and counterclockwise rotation relative to a work stand in contact therewith to generate a linearly reciprocating frictional force in response to the driving force. The frictional force allows a work piece held by the work stand to be fed in a linearly reciprocating motion to be ground.