| 摘要 |
PROBLEM TO BE SOLVED: To provide an inner diameter measuring apparatus capable of precisely and speedily measuring inner diameters. SOLUTION: In the inner diameter measuring apparatus, the diameters of a plurality of holes partially communicating, adjacent, and extended in parallel with one another are measured. The inner diameter measuring apparatus is provided with a plurality of noncontact measuring parts 4 each for measuring the diameter of the holes. The inner diameter measuring apparatus has an undercarriage 1 which propels itself through the inside of the plurality of holes, and the plurality of measuring parts 4 are provided on the undercarriage 1. COPYRIGHT: (C)2005,JPO&NCIPI
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