Level curve cutting of NURBS-approximated free formed surfaces

Rene Schoene; Alexander Zimmermann; Tobias Hanning

doi:10.1117/12.605239

2 June 2005 Level curve cutting of NURBS-approximated free formed surfaces

Rene Schoene, Alexander Zimmermann, Tobias Hanning

Proceedings Volume 5824, Opto-Ireland 2005: Nanotechnology and Nanophotonics; (2005) https://doi.org/10.1117/12.605239
Event: OPTO-Ireland, 2005, Dublin, Ireland

Abstract

The requirements of optical surfaces are increasing with respect to their functionality and accuracy of form. Furthermore, it is a goal for the optical industry to unify the lens process from development to production. In our phase of design we have an arbitrary set of 3D-points of a free formed surface. With approximation through NURBS, we get a continuous description of this surface. To the generated NURB-Spline, we have developed a CNC-program for the UPM-3000 machine, which drives the cutter along the level curve. Therefore, we triangulate the NURBS-surface. By the desired accuracy and the generated triangles, we determine levels of the surface. Thus, we refine the given triangulation. Hence we have a triangular decomposition for each level, which will be driven along by the cutter. The described method will be compared to the common raster-fly-cut-method for accuracy and cutting time.

Citation Download Citation

Rene Schoene, Alexander Zimmermann, and Tobias Hanning "Level curve cutting of NURBS-approximated free formed surfaces", Proc. SPIE 5824, Opto-Ireland 2005: Nanotechnology and Nanophotonics, (2 June 2005); https://doi.org/10.1117/12.605239

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