NURBS

NURBS Interpolation
Non-Uniform Rational B-Spline Interpolation

Recently NURBS has gained increased notoriety as a method of expressing complex curves and smooth shaped surfaces. Non-uniform shapes such as these are commonly in the design of molds for the aerospace and automobile industries.

1. What is NURBS INTERPOLATION?

(1)

This feature allows the interpolation of complex curved surfaces, by utilizing the same expressions that were used to describe the surfaces in the design stage. Previously, Spline shapes were only achievable by generating a multitude of small liner moves creating approximately the same shape. Some of the benefits of using NURBS interpolation are:

		Smooth cutting surface of the work piece can be obtained.
		Length of CNC part-program can be drastically reduced.
		Cutting time can be reduced.

2. By using NURBS INTERPOLATIO

(1)	The length of the CNC part-program shortens about 1/3--2/3 compared with the CNC part-programs by small consecutive lines.
(2)	Data Transmission from host computer to CNC is faster because of the shortened data length.
(3)	Smoother cutting surfaces are obtained by interpolating the actual curved surface.

3. NURBS Interpolation can be used effectively when

(1)	Part shape has no excessive radial features which require abrupt changes in feed rate.
(2)	Large shapes, which typically experience reduced line definition when increasing shape tolerance.
(3)	Smooth shapes, which are designed by differential calculus expressions.

4. Sample work piece

Buckley Owens Machinery Corp.
6416 Fly Road | East Syracuse, New York 13057
Telephone 315.432.0708
Fax 315.432.0736

Email: info@buckleyowens.com