| 摘要 |
A reference fixture ( 20 ) for a roundness measuring instrument performs acquisition of origin information of a roundness measuring instrument ( 1 ) including a workpiece rotary mechanism ( 3 ) on which a workpiece is set and a probe ( 14 ) provided with a stylus ( 14 a) and also performs calibration of the probe ( 14 ). The reference fixture ( 20 ) includes a mount ( 21 ), a calibration master ( 22 ) provided on a top face of the mount ( 21 ) for calibrating the sensitivity of the probe ( 14 ), an origin ball ( 23 ) disposed above the calibration master ( 22 ) for providing the origin information of the roundness measuring instrument ( 1 ) by the stylus ( 14 a) of the probe ( 14 ), and a holder ( 25 ) that holds the origin ball ( 23 ).
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