| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary shaft device capable of efficiently and reliably measuring the machining accuracy of ball rolling grooves formed in an outer circumferential surface of a shaft body.SOLUTION: A rotary shaft device 3 has a shaft body 20 rotatably supported by angular bearings 35, 36, and a support body 40 that rotatably supports the shaft body 20 via the angular bearings 35, 36. Gothic arch-shaped ball rolling grooves 21 for causing a rolling element 39 in the angular bearings 35, 36 to roll are formed on the outer circumferential surface of the shaft body 20. |
