Mori Seiki Co., Ltd.

Mikio Iwakiri

Munetaka Wakizaka

Kazutada Hashimoto

Masaaki Yokoyama

Hiroshi Mizuguchi

A method and apparatus by which accurate correction values for thermal displacement is calculated even when the rotation of the main spindle is restarted after interruption. The apparatus has means for measuring the temperature near the main spindle means for estimating the thermal displacement of the main spindle on the basis of the measured temperature and a predetermined thermal displacement calculation expression, means for calculating the correction value, and means which estimates the displacement delay in re-rotation caused by the interruption of the rotation of the main spindle and calculates an adjusting displacement on the basis of the estimated displacement delay. The correction value calculating means calculates a correction value on the basis of the thermal displacement estimated by the thermal displacement estimating means alone when the main spindle is started up and rotated.

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Yamatokoriyama, Japan

Mikio Iwakiri