Method of creating NC data for complex curved surfaces

A method of creating NC data for a complex curved surface including a combination of at least two three-dimensional curved surfaces, comprising the steps of:

• (a) inputting data specifying each of the at least two three-dimensional curved surfaces and data for specifying a cutting path pattern for each of the at least two three-dimensional curved surfaces, said inputting step comprising inputting a cutting path pattern which is one of a pattern of equidistantly spaced parallel straight lines, a pattern of equiangularly spaced radiating straight lines, and a pattern of equidistantly spaced concentric circular arcs;
• (b) obtaining points discretely from a cutting starting point of a first of the at least two three-dimensional curved surfaces to a boundary point with a second of the at least two three-dimensional curved surfaces along the cutting path pattern set for the first curved surface;
• (c) obtaining points discretely on the second curved surface along the cutting path pattern specified with respect to the second curved surface;
• (d) thereafter performing a pick-feed and obtaining points discretely along the cutting path patterns on each of the first and second curved surfaces by repeating said steps (b) and (c);
• and
• (e) creating NC data for generating a complex curved surface by successively traversing each of the points obtained in said steps (b), (c) and (d).