Automatic generation of min/max tolerance charts for tolerance analysis from CAD models

Z. Shen, J. J. Shah, J. K. Davidson

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The so-called min/max tolerance charts are popular for analysing tolerance accumulation in parts and assemblies, despite the fact that this method is limited to one-dimensional worst-case analysis. Since different chart construction rules apply to different tolerance classes, the user has to remember all the different rules to construct a valid tolerance chart. Constructing the charts manually, as is common practice in industry today, is time-consuming and error-prone. This paper presents procedures for automating tolerance charting. It requires a computer aided design (CAD) model with GDT specifications as input. The automation is based on a data model called the constraint-feature-tolerance (CTF) graph and machine interpretable representation of charting rules specific to each tolerance class. This paper also presents procedures for automatically extracting dimension and tolerance stacks for any user defined analysis dimension, and automatic part arrangement in assemblies corresponding to worst case analyses. Important implementation issues are also discussed and several case studies are presented, the results of which have been verified by manual chart construction.

Original languageEnglish (US)
Pages (from-to)869-884
Number of pages16
JournalInternational Journal of Computer Integrated Manufacturing
Volume21
Issue number8
DOIs
StatePublished - Dec 2008

Keywords

  • Automatic charts
  • Tolerance analysis
  • Tolerance charts
  • Worst-case analysis

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering

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