Method of assembling an actuator arm system for a hard disk

1. A method of assembling an actuator arm system for a hard disk drive comprising:

positioning a lower bearing on a flange, the lower bearing having an inner race and an outer race, the flange supports the inner race in an axial direction relative to a shaft and the flange is in direct contact with the inner race, and wherein the lower bearing and an upper bearing are positioned on the same side of the flange;

placing an actuator arm on the outer race of the lower bearing wherein the actuator arm is in contact with the outer race of the lower bearing;

placing the upper bearing on the shaft, the upper bearing having an inner race and an outer race, wherein the outer race of the upper bearing is in contact with the actuator arm, such that the actuator arm is located between the lower bearing and the upper bearing;

applying an adhesive between the inner race of the upper bearing and the shaft;

applying an axial preload force to the inner race of the upper bearing;

curing the adhesive; and

releasing the preload force.

2. The method of claim 1 , wherein the upper bearing and the lower bearing have equivalent inner bores.

3. The method of claim 1 , wherein the upper bearing and the lower bearing have different inner bores.

4. The method of claim 1 , wherein the upper bearing and the lower bearing have equivalent outer diameters.

5. The method of claim 1 , wherein the upper bearing and the lower bearing have different outer diameters.

6. The method of claim 1 , wherein the actuator arm system does not include a sleeve to receive the upper bearing and the lower bearing.

7. The method of claim 1 , wherein the shaft includes the flange that restrains the lower bearing.

8. The method of claim 1 , wherein the actuator arm is shaped such that a gap exists between the actuator arm and the shaft.

9. The method of claim 1 , wherein the shaft comprises a threaded hole in the top of the shaft.