| 摘要 |
A method and a device for detecting the incorrect chucking of a machine tool capable of easily and surely detecting a chucking error; the method, comprising the steps of measuring, by a sensor ( 12 ), the change of a distance (d) between the sensor ( 12 ) and the outer peripheral surface of the flange part ( 2 B) of a tool holder ( 2 ) installed in a spindle ( 3 ) through all around the periphery of the tool holder while rotating the tool holder ( 2 ), performing a FFT analysis of the measured data by a CPU ( 18 ), extracting a fundamental frequency component, and calculating the amplitude thereof, whereby the eccentric amount of the tool holder ( 2 ) can be calculated by using the amplitude of the fundamental frequency component and, when the eccentric amount exceeds a preset allowable value, the tool holder ( 2 ) is judged to cause an incorrect chucking.
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