Single piece hub with integral upper and lower female cones and method for making the same

(canceled)

(canceled)

A method of forming an integral, one piece hub for a dual conical fluid dynamic bearing comprising:

• defining a center hole having an opening dimensioned to accommodate a narrow end of each cone of a dual conical bearing, as well as passage of a tool for cutting surfaces of each of a pair of female cones in said hub defining each of a pair of female cones in said integral hub utilizing the tool which has a width dimension less than or equal to the angled dimension through the central opening so that each of said pair of female cones may be cut from one side of said hub.

A dual conical fluid dynamic bearing comprising a hub having first and second female cones defined therein and joined by a central opening, the central opening being a sufficient width to accommodate means for serially cutting the first and second cones without modification of setup of said hub relative to said cutting means.

A motor hub for use in a dual conical fluid dynamic bearing comprising first and second conical elements joined together with their narrow ends facing each other, the motor hub comprising first and second female openings defined by generally conical surfaces and joined together at an opening near the center of the hub, the opening between the first and second cones being sufficiently large to allow a tool traversing on a cone angle through the central opening to define both first and second conical surfaces on a single machine set up.