| 摘要 |
PROBLEM TO BE SOLVED: To provide a channel form-measuring apparatus of a ball channel which can precisely measure circular arc forms on both sides of the channel width of a ball channel making contact with a ball. SOLUTION: In this channel-form measuring apparatus of a ball channel, a measuring probe 23a smaller than the channel width of a ball channel 4 is arranged energized against the inner surface of the ball channel 4, at a prescribed position in the ball channel of a work, and moved in the direction crossing the ball channel 4. The probe 23a is displaced along a circular arc form of the ball channel 4 and toward the inside and the outside of the channel. By calculating the circular arc form of the inner surface of the ball channel 4 from the locus of the element, the center of the circular arc making a contact with a ball 6 is obtained, and the channel form of the ball channel 4 can be measured precisely.
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