Abstract: A grinding machine having a movable workhead for carrying a workpiece and a movable wheelhead for carrying a grinding wheel, the workhead and the wheelhead being axially movable along intersecting paths. The wheelhead is provided with a lead screw drive in which the screw is fixed against rotation and the nut carried by the wheel-head platform is rotated by a gear drive but is fixed axially. This drive is used to provide micrometric movement. The screw terminates at one end in a piston in a hydraulic cylinder, this providing piston/cylinder drive for large amounts of wheelhead movement. Workhead feed is provided by a rotatable and axially displaceable spindle drive by a step-by-step electric motor through a gear train that converts the rotary motion output of the electric motion to corresponding axial movement of the spindle.

Abstract: A grinding machine having a movable workhead for carrying a workpiece and a movable wheelhead for carrying a grinding wheel, the workhead and the wheelhead being axially movable along intersecting paths. The wheelhead is provided with a lead screw drive in which the screw is fixed against rotation and the nut carried by the wheelhead platform is rotated by a gear drive but is fixed axially. This drive is used to provide micrometric movement. The screw terminates at one end in a piston in a hydraulic cylinder, this providing piston/cylinder drive for large amounts of wheelhead movement. Workhead feed is provided by a rotatable and axially displaceable spindle drive by a step-by-step electric motor through a gear train that converts the rotary motion output of the electric motion to corresponding axial movement of the spindle. .Iadd.