Integrated CAD frameworks: Tolerance representation scheme in a solid model

Utpal Roy, C. R. Liu

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The major objective of this paper is to develop a representational scheme for geometric tolerances that are to be interfaced with a solid model. This includes the development of (i) an efficient user interface system for input of tolerance information, (ii) a suitable tolerancing data module (to be attached to the solid model), and (iii) an information retrieval system from the stored database for future tolerance analysis. This user interactive environment which enables the user to input the tolerance information in both the unevaluated (CSG) and the evaluated (B-Rep) databases, requires an effective linking mechanism between the CSG and the B-Rep data models at each stage of the object development. This has been achieved through the development of a reference face list. Tolerance information has been attached with this face list as "constraint nodes", which are formed and updated after each "set operation." Several functions have also been developed to retrieve essential information from the data structure in order to answer various queries. The prototype system has been implemented on a polyhedral solid modeler based on this representational scheme.

Original languageEnglish (US)
Pages (from-to)495-509
Number of pages15
JournalComputers and Industrial Engineering
Issue number3
StatePublished - Jul 1993

ASJC Scopus subject areas

  • General Computer Science
  • General Engineering


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