Patent ID: 8191232

Claim:
A method of manufacturing a spindle motor including a shaft disposed along a central axis, an annular portion stretching radially outward from an outer peripheral surface of the shaft, a substantially cylindrical sleeve receiving the shaft and having an inner peripheral surface radially opposite the outer peripheral surface of the shaft and a bearing surface opposite the annular portion, and a hub rotating together with the sleeve and supporting a disk, the method comprising the steps of: a) fixing the sleeve and the hub to each other; and b) after the step a), performing cutting on the inner peripheral surface of the sleeve, the bearing surface of the sleeve, and a flange surface of the hub for mounting the disk thereon with the sleeve and the hub being gripped and rotated around the central axis; wherein in the step b), the cutting is continuously performed by making a single pass with a single cutting tool on a surface of the sleeve and a surface of the hub at a border between the sleeve and the hub.