Patent ID: 7647690

Claim:
A manufacturing method of a sleeve housing accommodating a sleeve for rotatably supporting an axial member including a shaft, a discoid portion arranged at a top end of the shaft, an annular portion arranged axially below the discoid portion, and a collar portion arranged between the discoid portion and the annular portion, the method comprising the steps of: a) forming, by press working, the sleeve housing to have a preliminary shape including therein a substantially cylindrical portion and a collar portion extending in an outward direction; b) retaining via a retaining portion, which relatively rotates with respect to a cutting tool concentrically about a predetermined rotational axis, the sleeve housing in the form of the preliminary shape; and c) cutting on a lower portion of the collar portion while using a top portion of the collar portion as a datum plane for controlling an axial distance between the lower portion and the top portion of the collar portion.