Patent ID: 9533392
Date: 2017-01-03
CPC Classifications: B23Q,G05B

Claim:
1. A machine tool comprising: a rotary table for attaching a workpiece; a motor for driving the rotary table; a clamping mechanism for clamping rotation of the rotary table; and a timer for setting a time taken until a subsequent command is made available after an unclamping command for releasing a clamping operation of the clamping mechanism to a set time, wherein the machine tool includes a load measurement unit for measuring a load of an output shaft of the motor, a reference load storage unit for storing a reference load of the rotary table in advance, a provisional load storage unit for measuring and storing, as a provisional load, a load obtained when an unclamping command of the rotary table is output and the rotary table is rotated after the set time set in the timer passes, a load comparison unit for comparing the provisional load stored in the provisional load storage unit with the reference load stored in the reference load storage unit, and a timer changing unit for changing the set time of the timer when the provisional load exceeds the reference load as a result of comparison of the load comparison unit.