Abstract: A method of forming a hydrostatic nut that cooperates with a lead screw for translating a wheel head, or carriage, on a grinding machine, such as a cam grinder. A lead screw, which is externally threaded, is inserted into a cylindrical mold, which is internally threaded. The lead screw is retained therein by pressure plates that seal off opposite ends of the open bore of the mold.A continuous cavity is defined between the internal threads on the nut and the external threads on the lead screw. An epoxy resin or other castable polymer is introduced through an inlet port in the mold into the cavity. The castable polymer is allowed to cure into a rigid mass that adheres to the internal threads on the mold. The lead screw is removed, and the mold may be machined to its final configuration as a hydrostatic nut.At least one helical channel is defined in the outer surface of the rigid mass adhered to the mold.

Abstract: A numerical control apparatus for grinding a peripheral edge of a glass sheet, comprises a grinding head having a grinding wheel which is supported in an air-floating manner by an air cylinder and subjected to angularly rotating control so that the grinding wheel is brought into contact with the peripheral edge of the glass sheet, and a brake means for restricting an air-floating movement of the grinding wheel.