Method of manufacturing a shaft with surfaces thereof modified

A method of manufacturing a shaft having modified surfaces comprising:

• forming a plurality of thread grooves with respective crests of thread ridges on an outer surface of a cylindrical-shaped base material for a shaft;
• continuously winding a length of wire in and along the thread grooves;
• and
• compressing a peripheral surface of the base material for the shaft with the length of wire wound and received in the thread grooves by a rolling method, in a direction of diameter reduction to perform plastic deformation of the crests of the thread ridges between two adjacent thread grooves or the crests and the wire such that the length of wire is fixed to and united with the base material for the shaft to form a fixed and united wire whose outer surface is substantially flush with the surface of the shaft, and so that the wire is completely spirally embedded in the vicinity of the surface of the base material for the shaft.