Patent ID: 7824246

Claim:
A wheel spindle device for a grinding machine, comprising: a wheel head of the grinding machine; a wheel spindle rotatably carried on the wheel head; and a plurality of grinding wheels attached to the wheel spindle and each composed of a core member attached to the wheel spindle and a grinding layer provided on the circumferential surface of the core member and having numerous abrasive grains bonded with a bonding material, wherein: a reference position for specifying a position in the circumferential direction is defined on each of the core members; a plurality of inclined grooves which are inclined relative to the circumferential direction of each grinding wheel are formed at predetermined angular intervals on the circumferential surface of the grinding layer on the basis of the reference position; and the inclined grooves formed on the grinding layer of each grinding wheel are shifted in angular phase from said reference position by a different angular distance as compared to the inclined grooves formed on the grinding layer of another grinding wheel.