AN INVESTIGATION OF STEREOLITHOGRAPHY AS A MEANS OF PROTOTYPING FROM A CAD DATABASE

Authors
  1. Hidson, D.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
The Stereolithography (SLA) process was investigated to test its efficacy in producing three-dimensional parts from a Unigraphics CAD file. The method uses a photo-sensitive resin that is cured by means of a laser beam. The laser is directed to follow the CAD file and a model is built up with successive layers of resin between 0.127 and 0.508 mm (0.005 and 0.020 inch). Once the model is constructed, it is bathed in ultra-violet light for a post curing process. It was found that the model undergoes various amounts of contraction and expansion, distorting its shape. A quantitative assessment of this is given. The process is very useful in producing a three-dimensional model from the CAD file, but the dimensional integrity is not sufficient for producing accurately dimensioned prototypes.
Report Number
DREO-TN-92-25 — Technical Note
Date of publication
01 Jun 1992
Number of Pages
23
DSTKIM No
93-01149
CANDIS No
129106
Format(s):
Hardcopy;Originator's fiche received by DSIS

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