ABSTRACT
This paper presents a method of Max-Fit biarc curve fitting technique to improve the accuracy of STL files and to reduce the file size for rapid prototyping. STL file has been widely accepted as a de facto standard file format for the rapid prototyping industry. However, STL format is an approximated representation of a true solid/surface model, and a huge amount of STL data is needed to provide sufficient accuracy for rapid prototyping. This paper presents a Max-Fit biarc curve fitting technique to reconstruct STL slicing data for rapid prototyping. The Max-Fit algorithm progresses through the STL slicing intersection points to find the most efficient biarc curve fitting, while improving the accuracy. Our results show the proposed biarc curve-fitting technique can significantly improve the accuracy of poorly generated STL files by smoothing the intersection points for rapid prototyping. Therefore less strict requirements (i.e. loose triangle tolerances) can be used while genarating the STL files.
- 1.Akima, H., "A new method of interpolation and smooth curve fitting based on local procedures," Journal of ACM, 1970, pp. 589-602. Google ScholarDigital Library
- 2.Dolenc, A. and Makela, I., "Slicing procedures for layered manufacturing techniques," Computer Aided Design, Vol. 26, No. 2, 1994, pp. 119-126.Google ScholarCross Ref
- 3.Hope, R.L., Roth, R.N. and Jacobs, P.A., "Adaptive slicing with sloping layer surfaces," Rapid Prototyping Journal, Vol. 3, No. 3, 1997, pp. 89-98.Google ScholarCross Ref
- 4.Jamieson, R. and Hacker, H., "Direct slicing of CAD models for rapid prototyping," Rapid Prototyping Journal, Vol. 1, No. 2, 1995, pp. 4-12.Google ScholarCross Ref
- 5.Kulkami, P. and Durra, D., "An accurate slicing procedure for layered manufacturing," Computer Aided Design, Vol. 28, No. 9, 1996, pp. 683-697.Google ScholarCross Ref
- 6.Koc, B., Ma, Y., and Lee, Y.-S., "Smoothing STL files by Max-Fit biarc curves for rapid prototyping," Rapid PrototypingJournal, Vol. 6, No. 3, 2000, pp. 186-203.Google ScholarCross Ref
- 7.Koc, B., and Lee, Y.-S., "Non-Uniform Offsetting and Hollowing Objects by Using Biarcs Fitting for Rapid Prototyping Processes" (in review) Submitted to Computers in lndsutry, 2000. Google ScholarDigital Library
- 8.Lee, Y.-S. and Chang, T.C., "A contour growth method from intersections of hunting planes to evaluate machining information," Journal of Design and Manufacturing, Vol. 2, No. 3, 1992, pp. I19-133.Google Scholar
- 9.Li, J., "Improving stereolithography parts quality: practical solutions," Third Int '1 Conf. on Rapid Prototyping, June 7- 10, Dayton, Ohio, 1992, pp. 17 l- 179.Google Scholar
- 10.Li, J., "Precise rapid prototyping," Fourth lnt'l Conf. on Rapid Prototyping, June 14-17, Dayton, Ohio, 1993, pp. 349-355.Google Scholar
- 11.Luo, R.C. and Ma, Y. (1995), "A slicing algorithm for rapid prototyping and manufacturing," IEEE Int'l Conf. Robot. & Auto, May 1995, pp. 2841-2846.Google Scholar
- 12.Ma, Y., "Representation and slicing of freeform 3D geometric models for desktop prototyping and manufacturing," Ph.D. Dissertation, Dept. Electrical and Computer Engineering, North Carolina State' University, Raleigh, NC, USA, 1995. Google ScholarDigital Library
- 13.Meek, D.S. and Walton, D.J., "Approximation of discrete data by G 1 arc splines," Computer Aided Design, Volume 24, Number 6, 1992, pp. 301-306.Google ScholarCross Ref
- 14.Rajagopalan, M., Aziz, N.M., Huey, C.O., "A model for interfacing geometric modeling data with rapid prototyping systems, "Advances in Engineering Software, Vol. 23, 1995, pp. 89-96.Google ScholarCross Ref
- 15.Sabourin, E., Houser, S.A. and Bohn, J.H., "Adaptive slicing using stepwise uniform refinement," Rapid Prototyping Journal, Vol. 2, No. 4, 1996, pp. 20-26.Google ScholarCross Ref
- 16.Schonherr, J., "Smooth biarc curves," Computer-Aided Design, Vol. 25, 1993, pp. 365-370.Google ScholarCross Ref
- 17.Su, B.Q. and Liu, D.Y., Computational Geometry - Curve and Surface Modeling, Academic Press, USA, 1989. Google ScholarDigital Library
- 18.Sub, Y.S. and Wozny, M.J., "Adaptive slicing for solid freeform fabrication processes," Solid Freeform Fabrication Symposium, University of Texas at Austin, TX, 1994, pp. 401-411.Google Scholar
- 19.Yeung, M.K. and Walton, D.J., "Curve fitting with arc splines for NC toolpath generation," Computer Aided Design, Volume 26, Number 11, 1994, pp. 845-849.Google ScholarCross Ref
Index Terms
- Max-fit biarc fitting to STL models for rapid prototyping processes
Recommendations
Non-uniform offsetting and hollowing objects by using biarcs fitting for rapid prototyping processes
This paper presents a new method of using non-uniform offsetting and biarcs fitting to hollow out solid objects or thick walls to speed up the part building processes on rapid prototyping (RP) systems. Building a hollowed prototype instead of a solid ...
Contour curve reconstruction from cloud data for rapid prototyping
In this study, a method for generation of sectional contour curves directly from cloud point data is given. This method computes contour curves for rapid prototyping model generation via adaptive slicing, data points reducing and B-spline curve fitting. ...
Rapid Prototyping and User-Centered Design of Interactive Display-Based Systems
Rapid prototyping is a broad field encompassing many domains and varied approaches. This article presents the authors' experiences using user-centered rapid prototyping approaches for developing display-based ubiquitous systems for deployment in real-...
Comments