US Patent 7640833 Method of manufacturing molding body having grooves thereon

There is provided a method of manufacturing a molding body having at least one groove thereon. The method is performed by rotating a workpiece, allowing a tip to contact with an outer peripheral or an inner peripheral face, so as to form the groove in accordance with a shape of an outer edge of the tip, and shifting a position of the tip along a direction orthogonal relative to a rake face of the tip without changing a direction of the rake face thereof, so as to form another groove having a different angle from that of the shape of the outer edge of the tip.