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Proceedings Paper

Level curve cutting of NURBS-approximated free formed surfaces
Author(s): Rene Schoene; Alexander Zimmermann; Tobias Hanning
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Paper 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.

Paper Details

Date Published: 2 June 2005
PDF: 8 pages
Proc. SPIE 5824, Opto-Ireland 2005: Nanotechnology and Nanophotonics, (2 June 2005); doi: 10.1117/12.605239
Show Author Affiliations
Rene Schoene, Univ. of Passau, FORWISS (Germany)
Alexander Zimmermann, Univ. of Passau, FORWISS (Germany)
Tobias Hanning, Univ. of Passau, FORWISS (Germany)

Published in SPIE Proceedings Vol. 5824:
Opto-Ireland 2005: Nanotechnology and Nanophotonics
David Kennedy; Werner J. Blau; John Colreavy, Editor(s)

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