| 摘要 |
PURPOSE:To measure an internal diameter accurately and easily by providing an attachment base stored in the internal-diameter part of a body to be measured, fixing device which fixes said attachment base to said internal-diameter part, a couple of reference pins fixed to said attachment base, etc. CONSTITUTION:An internal-diameter measuring device 8 is equipped with the attachment base 9, fixing device 10, and a couple of reference pins 11 and 12, and the attachment base 9 is so shaped that it is stored with a specific gap to the internal-diameter part 4. Then, the reference pins 11 and 12 are fixed to the attachment base 9, which is fixed to the internal-diameter part 9; when the reference pins 11 and 12 are pressed against an inner circumferential surface 4a, the intersection C of axial lines of the reference pins 11 and 12 coincides with the center O1 of the circle of the internal-diameter part 4. Therefore, the internal diameter of the incomplete internal-diameter part of the measured body which is semicircular or semicircular with a cut is measured accurately and easily. |
