Method of manufacturing rotary driving device by shaving a surface of a turntable with a cutting tool having a flat cutting edge

A method of manufacturing a rotary driving device, the method comprising the steps of:

• (a) mounting a turntable to a rotary shaft, the turntable being equipped with an anti-slipping section on a disc-placeable surface;
• (b) rotating the turntable;
• (c) providing a cutting tool having (i) a flat cutting edge substantially orthogonal to (a) an axial direction of the rotary shaft and (b) a longitudinal axis of the cutting tool and (ii) a height substantially parallel to an axial direction of the rotary shaft;
• and
• (d) shaving off a disc-contact surface, with which a disc contacts when the disc is placed, of the anti-slipping section with the cutting tool from outside of the disc-placeable surface toward the rotary shaft,
• wherein the flat cutting edge of the cutting tool is placed widthwise in parallel with an end face of the anti-slipping section and thickness-wise along an axial direction of the rotary shaft and the height of the cutting tool increases as the cutting tool extends away from the rotary shaft.