Abstract: A centerless grinder 1 according to the present invention comprises a bed 108, a grinding wheel spindle stock 101, a regulating wheel spindle stock 102, a work rest 103, and the like. The grinding wheel spindle stock 101 and the regulating wheel spindle stock 102 are respectively moved toward and away from each other by feed devices 10, 10. The feed devices 10, 10 respectively comprise feed screws 11, 11 each having one end fixed to the work rest 103. Nuts 12, 12 are respectively retained in the grinding wheel spindle stock 101 and the regulating wheel spindle stock 102 in threading engagement with the feed screws 11, 11 so that axial movements thereof along the feed screws 11 are restricted and rotational movements thereof about axes thereof are permitted. The nuts 12, 12 are respectively rotated by driving motors 15, 15.

Abstract: A centerless grinder 1 according to the present invention comprises a bed 108, a grinding wheel spindle stock 101, a regulating wheel spindle stock 102, a work rest 103, and the like. The grinding wheel spindle stock 101 and the regulating wheel spindle stock 102 are respectively moved toward and away from each other by feed devices 10, 10. The feed devices 10, 10 respectively comprise feed screws 11, 11 each having one end fixed to the work rest 103. Nuts 12, 12 are respectively retained in the grinding wheel spindle stock 101 and the regulating wheel spindle stock 102 in threading engagement with the feed screws 11, 11 so that axial movements thereof along the feed screws 11 are restricted and rotational movements thereof about axes thereof are permitted. The nuts 12, 12 are respectively rotated by driving motors 15, 15.

Abstract: A double side grinding apparatus for thin disklike work comprises a pair of rotatable grinding wheels having opposed circular grinding faces provided by respective end faces and so arranged as to be movable relative to each other axially thereof, and work rotating means for rotating the thin disklike work about its own axis while supporting the work in a grinding position between the grinding faces so that opposite surfaces of the work to be worked on face the respective grinding faces of the pair of the wheels, with an outer periphery of the work intersecting an outer periphery of each grinding face and with the center of the work positioned inwardly of the grinding faces.