Patent ID: 7044830

Claim:
A numerical control apparatus for controlling a machine tool to shape a workpiece, the numerical control apparatus comprising: a chopping movement data generating means for performing a contour control, to control a contour along which the workpiece is cut, by controlling two or more control axes, and for generating movement data of the machine tool for performing a chopping operation, for cutting and shaping the workpiece, by controlling said two or more control axes at the same time as performing the contour control, and correction means for correcting a servo delay of each of said control axes to perform the chopping operation at the same time while performing the contour control, wherein said correction means corrects the servo delay of each of two or more of said control axes to perform the chopping operation at the same time while performing the contour control, so as to acquire a servo delay amount of each of said control axes by comparing an actual position feedback information for each of said control axes performing the chopping operation at the same time while performing the contour control with a command value, and wherein, said correction means also synthesizes said acquired servo delay amount of each of said control axes, and distributes said synthesized servo delay amount to a chopping interpolation vector and a contour control interpolation vector.