Abstract: The working head moving device adopted in the working apparatus for machining workpiece supported by the work setting section having the underside-abutting portion and the side-abutting portion can maintain proper machining conditions with adaptability to decrease in size of workpiece entailed by proceeding of machining, can perform machining on workpiece with high uniformity and precision, and can move the working head without causing damage to workpiece. There is provided the head moving system for moving the working head between the working-state position and the retracted-state position, and the head moving system has the trunnion support portion which allows the working head to rock about its oscillation axis perpendicular to the rotation axis of the rotary tool when the working head is pressed against workpiece in conformity with decrease of workpiece size entailed by proceeding of machining, thereby maintaining the angle of intersection of workpiece-contacted surface and the rotation axis invariant.

Abstract: The working head moving device adopted in the working apparatus for machining workpiece supported by the work setting section having the underside-abutting portion and the side-abutting portion can maintain proper machining conditions with adaptability to decrease in size of workpiece entailed by proceeding of machining, can perform machining on workpiece with high uniformity and precision, and can move the working head without causing damage to workpiece. There is provided the head moving system for moving the working head between the working-state position and the retracted-state position, and the head moving system has the trunnion support portion which allows the working head to rock about its oscillation axis perpendicular to the rotation axis of the rotary tool when the working head is pressed against workpiece in conformity with decrease of workpiece size entailed by proceeding of machining, thereby maintaining the angle of intersection of workpiece-contacted surface and the rotation axis invariant.

Abstract: The present invention provides a double-side grinder capable of grinding double-sides of an aluminum disk highly efficiently and affording a ground aluminum disk free of end-face flaw and superior in both surface accuracy and dimensional accuracy while obviating the occurrence of grinding marks extending in different directions. A rough grinding mechanism having rough grinding wheels disposed opposedly to each other is mounted, a finish grinding mechanism having finish grinding wheels disposed opposedly to each other is mounted just after the rough grinding mechanism, and a belt-like carrier having a large number of pockets formed longitudinally of the carrier with aluminum disks engaged therein is passed between the rough grinding wheels and the finish grinding wheels, thereby allowing double-sides of each aluminum disk to be subjected to rough grinding and finish grinding in a continuous manner.