Patent ID: 6942555

Claim:
A grindstone for shaping a gear profile, the grindstone including a toothed portion, the grindstone comprising: a base metal having an inner surface and an outer surface; a metal bonded super abrasive layer made of metal bond material and an abrasive, the metal bonded super abrasive layer being integrally formed on one of the inner surface and the outer surface of the base metal, and having a predetermined thickness in a radial direction, wherein the toothed portion having a profile corresponding to that of the gear profile is formed on the metal bonded super abrasive layer by electric discharge machining, and the one surface on which the metal bonded super abrasive layer is integrally formed has a profile different from the profile of the toothed portion so that the metal bonded super abrasive layer is formed in the predetermined thickness that enables the metal bonded super abrasive layer to be machined into the profile of the toothed portion by the electric discharge machining.