2003 / Solid Freeform Fabrication Proceedings
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Author B. Starly, A. Lau, W. Sun Dept. of Mechanical Engineering and Mechanics, Drexel University Philadelphia, PA 19104 and W. Lau, T. Bradbury, A. Youssef, C. Gaylo Therics, Inc. 115 Campus Drive Princeton, NJ 08540
Source Solid Freeform Fabrication Proceedings, 2003, pp 162-173.
Abstract Direct slicing of CAD models to generate process planning instructions for solid freeform fabrication may overcome inherent disadvantages of using STL format in terms of the process accuracy, ease of file management, and incorporation of multiple materials. This paper will present the results of our development of a direct slicing algorithm for layered freeform fabrication. The direct slicing algorithm was based on a neutral, international standard (ISO 10303) STEP-formatted NURBS geometric representation and is intended to be independent of any commercial CAD software. The following aspects of the development effort will be presented: 1) Determination of optimal build direction based upon STEP-based NURBS models; 2) Adaptive subdivision of NURBS data for geometric refinement;and 3) Ray-casting slice generation into sets of raster patterns. Feasibility studies applying the direct slicing algorithm to example models and the generation of fabrication planning instructions involving multi-material structures will also be presented. Keywords:Direct slicing, STEP, NURBS, free form shapes, adaptive subdivision. (Auth abstract) [References: 18] XX
Solid Freeform Fabrication Proceedings can be obtained from: The Solid Freeform Fabrication Symposium
or contact:
The University of Texas at Austin
Laboratory for Freeform Fabrication / Texas Materials Institute
Mechanical Engineering Dept.
c/o The Solid Freeform Fabrication Symposium
MC C2200
Austin, TX 78712-1063 USA
512-471-3026; 512-471-7681 FX; Email: sffsymp@uts.cc.utexas.edu