MACHINE TOOL AND MACHINE TOOL SPINDLE AND WORKPIECE MOUNTING-APPARATUS AND GRINDING PROCESS

摘要

A motorized spindle assembly for a grinding wheel is fabricated with an opening extending through the spindle casing, and stator and so as to extend in the direction of the spindle axis of rotation at least the length of the stator. The opening is of a size, depth, configuration and disposition so that when the spindle assembly is utilized to grind a workpiece and to do so is moved towards the workpiece, that portions of the workpiece are received within the opening thus permitting the spindle assembly and its grinding wheel to be moved as close as possible to the workpiece axis of rotation. The motorized spindle assembly is carried by a wheelhead for coaction with an additional spindle assembly carrying a grinding wheel with a larger radius. The larger radius grinding wheel is utilized to rough grind cam lobes and the smaller grinding wheel is utilized to finish grind the cam lobes and to grind concave cam contours for the cam lobes.