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Geometric tolerancing: I. Virtual boundary requirements

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2 Author(s)
Jayaraman, Rangarajan ; IBM Research Division, T. J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598, USA ; Srinivasan, V.

We examine the representation of geometric tolerances in solid-geometric models from the perspective of two classes of functional requirements. The first class deals with positioning of parts with respect to one another in an assembly, and the second with maintaining material bulk in critical portions of parts. Both are directly relatable to the geometry of the parts. Through examples, we demonstrate that these functional requirements can be captured in a specific form of tolerances designated as virtual boundary requirements (VBRs). We further demonstrate that the only proposed theory of tolerances in solid models, and the current dimensioning and tolerancing standards in industrial practice, are both inadequate for dealing with VBRs. Accordingly, we develop a theoretical basis for the rigorous statement and interpretation of VBRs.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:33 ,  Issue: 2 )

Date of Publication:

March 1989

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