Patent ID: 7507143

Claim:
A method for truing one or more grindstones of grinding wheels in a grinding machine operative for grinding a work by rotating one or more grinding wheels, wherein each grinding wheel is composed of a conductive grindstone having abrasive grains bound by a conductive binding material and has a grindstone surface, wherein an electro-discharge truing electrode disposed oppositely to one or more grindstone surfaces of the conductive grindstones is traversed relatively along the grindstone surfaces, and the grindstone surfaces are trued by electro-discharge action, and wherein a gap between each of the grindstone surfaces of the conductive grindstones and the electro-discharge truing electrode is controlled according to electrical information at one or more electro-discharge positions, and wherein the grinding machine comprises a controlling means for (1) controlling and adjusting the traversing speed of the electro-discharge truing electrode and the rotational speed of the grinding wheels to uniformly true the grindstone surfaces and eliminate undulations in the grindstone surfaces, and (2) maintaining a preset dimension of the gap between each of the grindstone surfaces and the electro-discharge truing electrode according to the electrical information at said one or more electro-discharge positions.