Single piece hub with integral upper and lower female cones

A combination comprising:

• a motor hub with a dual conical fluid dynamic bearing comprising:
• a first conical section having a first inner conical surface and a second conical section having a second inner conical surface, the first and second conical sections joined with respective narrow openings of the first and second inner conical surfaces directly connected and aligned to define a substantially circular central opening, each conical section further comprising a wide opening distal the central opening, the central opening being sufficiently large to allow a tool provided from one of the wide openings at an angle substantially parallel the inner surface of that conical section to traverse both the first inner conical surface and the second inner conical surface such that both of the first and second inner conical surfaces can be machined by the tool on a single machine set up;
• and
• the tool dimensioned for traversing both the first inner conical surface and the second inner conical surface without reorienting the tool with respect to the motor hub.