Attributed graph model for geometric tolerancing

Jami J. Shah, Bing Chun Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

23 Scopus citations


The development of a face-based attributed graph structure for modeling geometric tolerances is described here. The structure, designated as the DTF graph, provides an integrated view of the dimensioning scheme, dimensions, tolerances, features, and datums. In the current version of the DTF model, all ANSI Y14.5M tolerance classes are supported, except profile tolerances. Edge related tolerances (straightness, circularity) are supported by derived face intersections. Other tolerances, and datum reference frames, are supported as face attributes or attributes of the DTF graph. The tolerance model is compatible with commonly used hybrid CSG-Brep solid modelers and has the property of uniqueness for any dimensioning scheme. Applications of the DTF Graph include: detection of over and under-constrained dimensions, automatic re-dimensioning if the designer changes the dimensioning scheme, and automatic discovery of dimension-tolerance stack-up loops.

Original languageEnglish (US)
Title of host publicationAmerican Society of Mechanical Engineers, Design Engineering Division (Publication) DE
Place of PublicationNew York, NY, United States
PublisherPubl by ASME
Number of pages8
Volume44 pt 2
StatePublished - 1992
Event18th Annual ASME Design Automation Conference - Scottsdale, AZ, USA
Duration: Sep 13 1992Sep 16 1992


Other18th Annual ASME Design Automation Conference
CityScottsdale, AZ, USA

ASJC Scopus subject areas

  • Engineering(all)


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