| 摘要 |
In an external form measuring apparatus (11), an optical axis calibration value calculation unit (214) calculates a first optical axis calibration value (b1) based on measured value data (L 1 ) for a first calibration plate (17a) and design value data L 0 for the first calibration plate (17a). The optical axis calibration value calculation unit (214) calculates a second optical axis calibration value (b2) based on measured value data (L 11 ) for the second calibration plate (17b) and design value data (L 01 ) for the second calibration plate (17b). An external form calculation unit 215 calculates the external form of a crankshaft blank (1) through calibrating, based on the first and second optical axes calibration values (b1, b2), the measured value data (L 13 - L2 20 ) for the crankshaft blank 1. |
