Patent ID: 9696231
Date: 2017-07-04
CPC Classifications: G01M

Claim:
1. A machine tool having a numeric control device comprising the numeric control device and a machine tool controlled by the numeric control device and including a fixed unit and a movable unit, wherein a load can be placed on the movable unit of the machine tool, and the numeric control device includes: any one of the machine tool and the numeric control device is provided with a gravity center position display unit configured to display the position of the center of gravity calculated by the gravity center position calculation unit, and the gravity center position calculation unit is configured to calculate the position of the center of gravity of the entire set including the machine tool and the load, on the basis of the position of the center of gravity and the weight of the fixed unit and the position of the center of gravity and the weight of the movable unit stored in the storage unit, and a relative position of the movable unit with respect to the fixed unit, and the position of the center of gravity and the weight of the load, wherein the numeric control device includes a load weight estimation unit configured to estimate the weight of the load placed on the movable unit from a value of a parameter group related to acceleration or deceleration performance of the movable unit, and transmit the weight to the gravity center position calculation unit.