Immobilization check for fixture design

Kai Ming Yu, T. W. Lam, A. H.C. Lee

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


Fixture design contributes highly to manufacturing safety and quality. Computer aided fixture design (CAFD) facilitates more cost effective and efficient workholder design. However, heuristic and case-based approaches are still common. This paper addresses CAFD using the computational geometry approach. The correctness of a fixture design will be determined through vector-theoretic immobilization checking of the fixture points (i.e. location and clamping points) proposed. Details of the translational and rotational immobilization checking theory are explained, which are also applicable to general three-dimensional shapes. In real life, perfect geometry does not exist. As contemporary CAFD systems cannot cater for non-ideal geometry satisfactorily, the paper also develops an interval analysis scheme for toleranced immobilization checks. A real-life case study is presented to demonstrate the procedure.
Original languageEnglish
Pages (from-to)499-512
Number of pages14
JournalProceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture
Issue number4
Publication statusPublished - 28 May 2003


  • Computer aided fixture design
  • Immobilization analysis
  • Interval
  • Tolerance

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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