Abstract: A machine tool has a workholder and an axially aligned toolholder in juxtaposed relation, mounted for relative rotation. A first slide supported for longitudinal reciprocating movement along a "y" axis, supports a cross slide on which a toolholder is mounted for reciprocating crosswise movement to the first slide along an "x" axis. Bell crank motion transmission mechanism on the first slide is interposed between a push bar connected between an NC controlled rotary servo motor and the cross slide, and another NC controlled rotary servo motor is mounted to operate the first slide. Rotary to linear motion translation mechanism couples one servo motor to the first slide and another servo motor to the push bar. The push bar has a longitudinally extending flat face portion thereon and a member extends parallel with the flat face portion crosswisely to the longitudinal extent thereof to ride along the flat face portion.

Abstract: Method and apparatus for milling pins on a crankshaft by rotating the crankshaft through one complete revolution about its main axis while maintaining a rotating milling cutter in tangential contact with the pin at a fixed radius from the pin axis in a manner such as to cause the cutter to mill chips of a predetermined uniform size throughout the complete revolution of the crankshaft.