Patent ID: 7140947

Claim:
A barrel polishing method for polishing a mass, comprising the steps of: providing a polishing apparatus having a movable member elevatably moving and substantially covering an entire surface of an open portion of a polishing bath, a rotary disc positioned within the polishing bath, and a driving motor attached to the rotary disc; disposing at least one work piece and an abrasive media in the polishing bath; measuring a load current of the driving motor by means of applying a current to the driving motor to rotate the rotary disc, flowing the work piece and the abrasive media within the polishing bath to form a mass flow, and polishing the work piece with the abrasive media within a mass flow area; and controlling and maintaining the load current range of the driving motor to be within a preferable and predetermined load current range of the driving motor by moving the movable member toward or away from said rotary disc to adjust the mass flow area.