Rationalization and computer modeling of GD&T classes

Yanyan Wu, Jami J. Shah, Joseph K. Davidson

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

3 Scopus citations


The main focus of this research is to develop a mathematical model for GD&T (Geometric Dimensioning and Tolerancing) to support tolerance specification, validation and tolerance analysis. The model should be built on the clear definition of GD&T, both in terms of semantics and syntax. The current tolerance standards (Y14.5M-1994 and ISO 1101-1983) have many inconsistencies. We present a rational basis for GD&T by examining the basic elements involved in geometric variation and their interrelations. Tolerance classes are defined in terms of a target, a datum reference frame, and geometric relations. The GD&T global model developed is the basis for a set of computer tools for automatically generating and validating dimension and tolerance specifications based on the functionality of the part, checking dimensioning status and tolerancing status, and applying GD&T advisor.

Original languageEnglish (US)
Title of host publicationProceedings of the ASME Design Engineering Technical Conference
Number of pages15
StatePublished - 2002
Event22nd Computers and Information in Engineering Conference - Montreal, Que., Canada
Duration: Sep 29 2002Oct 2 2002


Other22nd Computers and Information in Engineering Conference
CityMontreal, Que.

ASJC Scopus subject areas

  • Engineering(all)
  • Computer Networks and Communications
  • Information Systems


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