| 摘要 |
PROBLEM TO BE SOLVED: To provide a circularity measuring device advantageous in improving measurement efficiency, and in reducing a burder of an operator.SOLUTION: An abutting surface 2602 of an upper side holding body 26 is allowed to abut on the upper end of an inner peripheral surface 2004 of a segment 20 by a circularity holding device 22, and an abutting surface 2802 of a lower side holding body 28 is allowed to abut on the lower end of the inner peripheral surface 2004 of the segment 20, and the inner peripheral surface 2004 of a plurality of segments 20 is held in a true circle shape. In this state, circularity α of the inner peripheral surface 2004 is calculated by using distances D1-D4 between the inner peripheral surface 2004 and the upper side holding body 26 or the lower side holding body 28 of the segment 20 detected by first-fourth distance sensors 34A-34D and a distance D5 between the upper side holding body 26 and the lower side holding body 28 detected by a fifth distance sensor 34E. |
