| 摘要 |
PROBLEM TO BE SOLVED: To provide the circularity measuring instrument which can easily measure the circularity of the internal surface of a body to be measured with high precision irrelevantly to the skillfulness of a measuring person, improves the operability, and shorten the operation time. SOLUTION: The main body of the circularity measuring instrument is constituted of a bearing part 1, a main shaft 2 supported rotatably in the bearing part 1, a rotary driving mechanism 3 which rotates the main shaft 2, a displacement detecting mechanism 4 which is fitted on the main shaft 2 and detects the internal-diameter directional displacement of the internal surface of the body 24 to be measured, and a rotational angle detecting mechanism 5 which detects the angle of rotation of the main shaft 2. The circularity measuring instrument is provided with a support moving mechanism 6 which moves the measuring instrument main body in the body 24 to be measured and a fixing mechanism 7 which fixes the measuring instrument main body at an arbitrary position on the internal surface of the body 24 to be measured.
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