| 摘要 |
PROBLEM TO BE SOLVED: To provide the gauge based upon the national standard and the CMM calibrating (three-dimensional coordinate measuring instrument) which uses the gauge. SOLUTION: The CMM calibration gauge 4 is constituted by mounting and fixing a sphere 2 on the top surface 3 of a block gauge 1 which has the absolute value of the length between a 1st end surface 6 and a 2nd end surface guaranteed as the national standard. For its use, the measurer 5 of the CMM is applied to >=3 points on the 1st end surface 6 to specify the plane of the 1st end surface 6, and a three-point measurer 5 is applied to the equator part and polar parts of the sphere 2 to specify the center coordinates and diameter of the sphere 2 from the plane of the 1st end surface 6 and then applied to the 2nd end surface 7 to correct the above specific values of the 2nd end surface and sphere, thus obtaining the CMM calibration gauge having the coordinates in the three- dimensional space of the sphere accurately specified.
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