Flexure assembly

• US 8,628,377 B2
• Filed: 02/10/2011
• Issued: 01/14/2014
• Est. Priority Date: 02/10/2011
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Goldsmith, Richard Jonathan, Herendeen, Mark Allen, Chapin, Robert Edward
• Primary Examiner(s): NGUYEN, GEORGE BINH MINH
• Application Number:
  US13/024,692
• Publication Number:
  US 20120208440A1
• Time in Patent Office: 1,069 Days
• Field of Search: 451/5, 451/8, 451/10, 451/278, 451/364, 451/387, 451/389, 451/390, 451/405, 269/55, 269/60, 269/903
• US Class Current: 451/11
• CPC Class Codes: B24B 37/30 for single side lapping of plane surfaces
• CPC Class Codes: B24B 41/06 Work supports, e.g. adjustable steadies B24B37/27 takes precedence

Abstract

A flexure assembly comprising a flexure stack comprising a plurality of individual webs connected together with a force in an x-direction to produce a friction in a z-direction orthogonal to the x-direction between the plurality of webs, the friction holding the plurality of webs in engagement. In some embodiments, the flexure assembly includes a second flexure stack fixedly spaced from the first stack comprising a second plurality of individual webs connected together with a second force in the x-direction to produce a second friction in the z-direction between the second plurality of webs. The flexure assembly may be used, for example, for supporting a workpiece such as a slider row bar in a lapping machine.

Claims

1. A flexure assembly for a lapping machine, the flexure assembly comprising:

a first flexure stack comprising a first plurality of individual webs connected together with a first force in an x-direction to produce a first friction in a z-direction orthogonal to the x-direction between the first plurality of webs, the first stack having a first side and a second side,

a second flexure stack fixedly spaced from the first stack comprising a second plurality of individual webs connected together with a second force in the x-direction to produce a second friction in the z-direction between the second plurality of webs, the second stack having a first side and a second side,

a first end support connecting the first side of the first stack to the first side of the second stack the first end support connected to an arm of the lapping machine, and

a second end support connecting the second side of the first stack to the second side of the second stack the second end connected to a lapping head, with,

the first friction and the second friction holding their respective plurality of webs in engagement.

2. The flexure assembly of claim 1 wherein each of the first flexure stack and the second flexure stack comprises at least 50 individual webs connected together in the x-direction.

3. The flexure assembly of claim 1 wherein each of the first plurality of individual webs and the second plurality of individual webs is clamped to provide the first friction and the second friction, respectively.

4. The flexure assembly of claim 1 wherein the first flexure stack has a different number of individual webs than the second flexure stack.

5. The flexure assembly of claim 1 wherein each of the individual webs comprises metal.

6. The flexure assembly of claim 5 wherein the metal is stainless steel.

7. The flexure assembly of claim 1 wherein each of the individual webs is 0.001 inch to 0.01 inch thick.

8. The flexure assembly of claim 1 further comprising a first plurality of spacers positioned between the individual webs of the first flexure stack, and a second plurality of spacers positioned between the individual webs of the second flexure stack.

9. A flexure assembly for a lapping machine, the flexure assembly comprising:

a first flexure stack comprising a first plurality of individual webs stacked in an x-direction and connected together; and

a second flexure stack comprising a second plurality of individual webs stacked in the x-direction and connected together, the second flexure stacked fixedly spaced from the first flexure stack in the x-direction;

both the first flexure stack and the second flexure stack fixed to an arm of the lapping machine and to a lapping head;

the flexure assembly allowing movement of the lapping head in relation to the arm along an x-axis and limiting rotational movement around each of the x-axis, a y-axis and a z-axis to less than 1 microradian, and inhibiting movement in a y-direction.

10. The flexure assembly of claim 9 limiting rotational movement around each of the x-axis, the y-axis and the z-axis to less than 0.5 microradian.

11. The flexure assembly of claim 9 wherein each of the first flexure stack and the second flexure stack comprises at least 50 individual webs connected together.

12. The flexure assembly of claim 9 wherein the first flexure stack has a different number of individual webs than the second flexure stack.

13. The flexure assembly of claim 9 wherein each of the individual webs comprises metal.

14. The flexure assembly of claim 13 wherein the metal is stainless steel.

15. The flexure assembly of claim 9 wherein each of the individual webs is no more than 0.005 inch thick.

16. The flexure assembly of claim 9 further comprising a first plurality of spacers positioned between the individual webs of the first flexure stack, and a second plurality of spacers positioned between the individual webs of the second flexure stack.

17. A lapping machine having an arm and a flexure assembly for supporting a workpiece, the flexure assembly comprising a flexure stack comprising a plurality of individual webs connected together, the flexure stack having a first side fixed to the arm and second side movable in relation to the arm, the workpiece operably connected to the moveable side.

18. The lapping machine of claim 17 further comprising a second flexure assembly comprising a second flexure stack the same as the flexure assembly, the second flexure assembly comprising a second flexure stack comprising a second plurality of individual webs connected together, the second flexure stack having a first side fixed to the arm and second side movable in relation to the arm, the workpiece also operably connected to the moveable side of the second flexure stack.

19. The lapping machine of claim 17 wherein the fixed side is physically closer to the arm than the moveable side.

20. The lapping machine of claim 17 wherein a portion of the arm extends over the flexure assembly and the workpiece.