Accession Number : ADA263410


Title :   An Investigation of Stereolithography as a Means of Prototyping from a Cad Database


Descriptive Note : Technical note


Corporate Author : DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)


Personal Author(s) : Hidson, D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a263410.pdf


Report Date : Jun 1992


Pagination or Media Count : 24


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.


Descriptors :   *COMPUTER AIDED DESIGN , *THREE DIMENSIONAL , *LITHOGRAPHY , TEST AND EVALUATION , MODELS , SHAPE , EXPANSION , PLASTICS , GLOVES , ANTHROPOMETRY , CONTRACTION , CURING , PROTOTYPES , LASER BEAMS , CANADA , LAYERS , DATA BASES


Subject Categories : Cybernetics
      Printing and Graphic Arts


Distribution Statement : APPROVED FOR PUBLIC RELEASE