Electro-chemically machining with a motor part including an electrode

1. A method comprising:

positioning a first motor part including a surface relative to an electrode,

wherein the positioning configures the surface to be electro-chemically machined by the electrode,

a first component includes the electrode, and

the first component is substantially similar to a motor component,

rotating the first motor part relative to the electrode and biasing motion of the first motor part using a magnet;

applying current to the electrode, and

electro-chemically machining the first motor part.

2. The method of claim 1 , further comprising adding fluid between the first motor part and the first component.

3. The method of claim 2 , wherein the fluid comprises an electrolyte configured for the electro-chemically machining, and wherein the fluid is further configured to form a fluid dynamic bearing with the first component and the first motor part.

4. The method of claim 3 , wherein the applying of the current to the electrode is configured to modify the form of the first motor part, wherein the form is selected from the group consisting of flatness, roundness, cylindricity, perpendicularity, taper, and run out.

5. The method of claim 1 , wherein the first component is substantially similar to a motor sleeve.

6. The method of claim 1 , wherein the electrode is at a surface portion of the first component.

7. The method of claim 1 , further comprising electro-chemically machining a second motor part connected to the first motor part.

8. A method, comprising:

rotating a first motor part relative to a first structure,

wherein the first structure is substantially similar to a second motor part;

biasing the rotation of the first motor part using a magnet; and

applying a first current to the first structure to electro-chemically machine the first motor part.

9. The method of claim 8 , wherein the first current is applied to an electrode of the first structure.

10. The method of claim 9 , wherein the electrode is at a surface portion of the first structure.

11. The method of claim 8 , further comprising rotating a third motor part within the first structure, wherein the third motor part is connected to the first motor part.

12. The method of claim 8 , further comprising adding an electrolyte between the first motor part and the first structure, wherein the electrolyte is configured to form a fluid dynamic bearing with first motor part and the first structure.

13. The method of claim 11 , further comprising applying a second current to a second structure to electro-chemically machine the first motor part.

14. A method comprising:

rotating a first component and a second component relative to one another, wherein the first component includes an electrode;

biasing rotation of the first component and the second component relative to one another using a magnet; and

applying current through the electrode for electro-chemically machining the second component, wherein the second component is a motor component.

15. The method of claim 14 further comprising:

adding an electrolyte between the first component and the second component.

16. The method of claim 14 , wherein the first component includes an insulator and another electrode separated from the electrode by the insulator, wherein the another electrode is configured to apply another current to a third component for electro-chemically machining the third component concurrent with the electro-chemically machining the second component.

17. The method of claim 14 further comprising:

rotating a third component and a fourth component relative to one another, wherein the third component includes another electrode; and

applying another current through the another electrode for electro-chemically machining the fourth component, wherein the fourth component is another motor component.

18. The method of claim 14 , wherein the first component is another motor component.