Abstract: A workpiece holding assembly for use on a chuck includes a chuck jaw and an adjustable self-centering workpiece holder. The chuck jaw has an elongated body with opposite ends, a groove defined in one end of the body, and a pair of arcuate recesses formed in the one body end on opposite sides of the groove. The workpiece holder includes a shaft portion and a base portion attached about a midsection of the shaft portion such that the holder has an integral, one-piece construction. The shaft portion is of generally cylindrical shape adapted to extend into the arcuate recesses of the one chuck jaw body end. The base portion is of greater than semi-circular shape and adapted to extend into the groove of the one chuck jaw body end. The base portion also has a generally semi-circular closed slot defined therethrough adapted to receive at least one fastener therethrough being fastenable to the one chuck jaw body for releasably clamping the base portion in the groove.

Abstract: A cutting disk mounting assembly includes opposing end plates with a stub shaft attached to an exterior surface of one end plate. The plates have a first axial bore formed in the interior surface of the one plate and a protruding axial hub formed on the interior surface of the other plate. The hub is sized to fit in the first bore so as to align the plates in a clamping relation with their interior surfaces located adjacent to one another. A second axial bore is formed through the other plate and the axial hub thereon and a third axial bore is formed through the one plate so as to open into the first bore therein. The third bore aligns with the second bore when the hub is fitted in the first bore. Also, the third bore contains threads which threadably interengage with a threaded fastening screw when the latter is applied through the second bore to attach the aligned plates together in the clamping relation with respect to a cutting disk when the latter is disposed therebetween.