Ball bearing cartridge for linear actuator

1. A data storage device comprising:

an actuator arm assembly comprising a first post defining a pivot axis that is inclined between about 5 degrees and about 25 degrees from a horizontal plane defined by a data storage disk surface;

a top guide rail comprising a first rolling surface that is parallel to the pivot axis;

a bottom guide rail spaced from the top guide rail and comprising a second rolling surface that is parallel to the first rolling surface; and

a first ball bearing comprising a first inner race and a first outer race, the first inner race surrounding the first post, and the first outer race in contact with the first rolling surface or the second rolling surface.

2. The device of claim 1 wherein the first outer race is offset from the first inner race along the pivot axis.

3. The device of claim 1 comprising a linear motor assembly comprising a second post, and wherein the first inner race surrounds the second post.

4. The device of claim 3 comprising a gap between the first and second posts.

5. The device of claim 3 wherein the first inner race is fixed to the first and second posts.

6. The device of claim 3 comprising:

a third post of the actuator arm assembly;

a fourth post of the linear motor assembly; and

a second ball bearing comprising a second inner race and a second outer race, the second inner race surrounding the third and fourth posts, and the second outer race in contact with the other of the first rolling surface or the second rolling surface.

7. The device of claim 6 wherein the first and second outer races do not contact each other.

8. The device of claim 1 wherein the first ball bearing does not contact the other of the first rolling surface or the second rolling surface.

9. A data storage device comprising:

an actuator arm assembly comprising one or more actuator arms, a block and a first post, the block having a first side coupled to the one or more actuator arms and a second side coupled to the first post, the first side being opposite to the second side;

a top guide rail comprising a first rolling surface;

a bottom guide rail spaced from the top guide rail and comprising a second rolling surface that is parallel to the first rolling surface; and

a ball bearing comprising an inner race and an outer race, wherein the ball bearing is configured to:

roll with the outer race:

in contact with the first rolling surface or the second rolling surface; and

not in contact with the other of the first rolling surface or the second rolling surface; and

rotate with the inner race surrounding the first post.

10. The device of claim 9 wherein the first post defines a pivot axis of the ball bearing, and wherein the pivot axis is parallel to each of the first and second rolling surfaces.

11. The device of claim 10 wherein the data storage device comprises a data storage disk surface defining a horizontal plane, and wherein the pivot axis is inclined between about 5 degrees and about 25 degrees from the horizontal plane.

12. The device of claim 10 wherein the outer race is offset from the inner race along the pivot axis.

13. The device of claim 9 wherein the inner race is fixed to the first post.

14. The device of claim 9 comprising a linear motor assembly comprising a second post, wherein the ball bearing is configured to rotate with the inner race surrounding the second post.

15. A method of assembling a data storage device comprising:

attaching a first ball bearing to a first post configured to extend between an actuator arm assembly and a linear motor assembly, wherein the first ball bearing comprises a first inner race, a first outer race, and a first pivot axis, and wherein the first post is part of a bearing cartridge;

positioning the bearing cartridge between a top guide rail and a bottom guide rail, at least one of the top or bottom guide rails having a rolling surface inclined between about 5 degrees and about 25 degrees from a horizontal axis;

pressing the top guide rail and the bottom guide rail toward each other to obtain an offset of the first outer race relative to the first inner race along the pivot axis; and

securing a spacing between the top and bottom guide rails to maintain the offset.

16. The method of claim 15 comprising adhering the bearing cartridge to a linear motor.

17. The method of claim 15 comprising contacting the first outer race with the top guide rail and not with the bottom guide rail.

18. The method of claim 17 comprising:

attaching a second ball bearing to a second post configured to extend between the actuator arm assembly and the linear motor assembly, wherein the second ball bearing comprises a second inner race and a second outer race, wherein the second post is part of the bearing cartridge; and

contacting the second outer race with the bottom guide rail and not with the top guide rail.

19. The method of claim 15 comprising contacting the first outer race with the bottom guide rail and not with the top guide rail.

20. The method of claim 15 wherein attaching the first ball bearing to the first post comprises adhering the first inner race to the first post.