| 摘要 |
PROBLEM TO BE SOLVED: To provide a machining jig capable of machining a highly precise groove for generating dynamic pressure and being manufactured at high mass productivity. SOLUTION: This machining jig 9 comprises an outer cylinder 3 having a plurality of holes 10, a core pin 4 inserted in the outer cylinder 3 via a space in the radial direction, and balls 2 arranged in the holes 10. The holes 10 are provided continuously in the circumferential direction of the outer cylinder 3 piercing the outer cylinder in the radial direction, and a circumferential groove 5 having a recessed surface 5a of the radius R of curvature larger than the radius of the balls 2 is provided in a part in contact with the balls 2 of the outer circumferential surface of the core pin 4.
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