Numerical control system

Abstract

According to the present invention, a numerical control devicemoves a plurality of machine elements of a machine toolalong a plurality of control axes on the basis of a moving pulse and performs an interference check calculation between two machine elements forming a prescribed set to be checked. The numerical control devicecomprises: an orientation dependence information storage unitwhich stores orientation dependence information that depends on shape and orientation and does not depend on the position of each of the two machine elements forming the set to be checked; an interference check unitwhich performs an interference check calculation on the basis of pieces of position information and the pieces of the orientation dependence information about the machine elements; and an orientation dependence information update unitwhich acquires pieces of shape information and pieces of orientation information about the machine elements, and updates the pieces of orientation dependence information on the basis of the pieces of shape information and the pieces of orientation information, wherein the orientation dependence information update unitdoes not update the pieces of orientation dependence information, when the pieces of orientation information do not change.