NUMERICAL CONTROLLER AND NUMERICAL CONTROL MACHINE TOOL

PROBLEM TO BE SOLVED: To provide an NC (numerical control) device and an NC machine tool controlling a position of a tool moving in each axis direction by the plurality of axes including a clamp axis, allowing reduction of a position error of the tool in a direction different from a movement direction by the clamp axis. SOLUTION: This NC device controlling the position of the tool by the plurality of axes including the mechanically clampable clamp axis driven by a plurality of servomotors has: a clamp decision part deciding whether the clamp axis is in a clamp state or in a non-clamp state, and outputting a clamp state signal; and a correction part correcting a position detection value or a position instruction value of the axis at least except the clamp axis on the basis of a previously stored correction value such that the position error of the tool generated according to the movement of the tool by the clamp axis is counteracted according to the clamp state signal. COPYRIGHT: (C)2006,JPO&NCIPI