Numerical control apparatus having a three-dimensional graphic display function

摘要

A numerical control apparatus having a three-dimensional graphic display function is provided. A three-dimensional space is divided into lattice points in storing the form data of a workpiece and a tool. When the same lattice data of a plane including an X-axis and Y- axis of three- dimensional coordinates is continuous in a Z-direction, i. e., the same form continues, those lattice point data are stored using a piece of lattice data and a continuity number, and the lattice data are stored in the form of a list of links. This allows the form data of the workpiece and tool to be stored using a small memory capacity and the accuracy of display to be improved where needed without increasing the memory capacity.