抄録
NURBS (Non Uniform Rational B-Spline) is well known to express free-form curves and surfaces in current CAD systems. In addition, controllers to accept NURBS format are available together with CAM systems to generate NURBS interpolation NC data. NURBS interpolation NC data have more advantages than conventional ones, for example, no error in comparison with approximating curved lines by small line segments, small amounts of NC data and so on. In the present circumstances, there are some main processors to generate CL data using NURBS interpolation for simultaneous 5-axis control. However, there are few post processor to transform CL data into NC data. Conventional post processors generate a large amount of NC data, while decreasing them at the expense of interpolation accuracy. Therefore, the study deals with a post processor which can create practical 5-axis NURBS interpolated NC data, considering the interpolation accuracy.
