Importance

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Abstract

A method and apparatus for using continuous-loop wires to drive circular flat-surfaced disk-type workholders which are positioned between two opposed upper and lower abrasive-surfaced rotatable platens. Flat-surfaced workpieces are mounted in receptacle openings in the workholders where both surfaces of the workpieces are simultaneously abraded by the two opposed platen that have annular bands of abrasive coatings. The drive wires allow the workholders to be driven at high speeds because of the smooth-action interface between the wires and the circular workholder disks that have circular wire grooves around the peripheries of the workholders. Each workholder assembly consists of a workholder disk, a drive wire, wire idlers, workholder idlers, a wire-tension device, a workholder disk support device and a wire drive motor. The workholder assemblies can be moved away from the platen surface to change platen abrasive disks. Three workholders provide stable three-point support of a floating upper platen.

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First Claim