Abstract: A device for machining the crank pins of a crankshaft which are radially offset from the crankshaft axis of rotation. A first master shaft having an axis of rotation and radially offset crank pins corresponding to the crank pins of the crankshaft is rotatably mounted in a housing. A substantially identical master shaft is rotatably mounted to one end of a cradle which has its other end pivotally mounted about the axis of the first master shaft and movable between a first and second position. A girt is rotatably mounted to each of corresponding crank pins on both master shafts so that, as the master shafts are rotatably driven in synchronism with each other and with the crankshaft, cyclical movement is imparted to each girt. A broach is attached to each girt adjacent the crankshaft so that, as the cradle is moved from its first to its second pivotal position, the broach moves tangentially with respect to the crankshaft crank pins and thereby machines the crank pins.

Abstract: A chuck mechamism for holding a workpiece during a machining operation comprising a frame, a stop block secured to the frame and an annular jaw slidably mounted within an annular channel in the frame. The jaw is movable between a clamping position in which a workpiece is held between the jaw and the stop block, and a nonclamping position. Preferably, the jaw includes a first sector and a second sector secured together by interlocking but spaced apart flanges. The flanges permit limited annular movement between the sectors.

Abstract: A novel apparatus is provided for sequentially feeding elongated workpieces in timed progression to a work performing area of a lathe. The lathe includes suitable means for grasping the ends of the workpiece once positioned within the work performing area and for rotatably driving the workpiece while performing a machining operation on the workpiece. The feed apparatus comprises a conveyor for sequentially moving the workpieces underneath the work performing area so that the workpieces are parallel to the axis of rotation of the lathe driving means but spaced downwardly therefrom. Elevator arms engage and lift a single workpiece to the work performing area whereupon the lathe engages the workpiece and performs the desired machining operation. Upon completion of the machining operation, the elevator arms return the workpiece to the conveyor. The conveyor then moves a subsequent workpiece into position for engagement with the elevator arms.