| 摘要 |
The inside diameter measuring method and apparatus are capable of making accurate measurement. In the inside diameter measuring method of measuring an inside diameter of a cylindrical work by supplying compressed air from one end of the work and by detecting a back pressure of the compressed air, a correction amount of measured value of the inside diameter according to a length of the work is obtained in advance by determining a change of measured value of the inside diameter with respect to a change of the length of the work, whereby the measured value of the inside diameter is corrected according to the length of the work. Thereby, even in the case where a plurality of works having a different length are measured, accurate measurement can always be made.
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