Intelligent DMU creation: Nominal CAD model preparation for automated tolerance allocation

Imelda Friel, Joseph Butterfield, Adelaide Marzano

Research output: Contribution to conferencePaper


This paper examines the integration of a tolerance design process within the Computer-Aided Design (CAD) environment having identified the potential to create an intelligent Digital Mock-Up [1]. The tolerancing process is complex in nature and as such reliance on Computer-Aided Tolerancing (CAT) software and domain experts can create a disconnect between the design and manufacturing disciplines It is necessary to implement the tolerance design procedure at the earliest opportunity to integrate both disciplines and to reduce workload in tolerance analysis and allocation at critical stages in product development when production is imminent. The work seeks to develop a methodology that will allow for a preliminary tolerance allocation procedure within CAD. An approach to tolerance allocation based on sensitivity analysis is implemented on a simple assembly to review its contribution to an intelligent DMU. The procedure is developed using Python scripting for CATIA V5, with analysis results aligning with those in literature. A review of its implementation and requirements is presented.
Original languageEnglish
Publication statusPublished - 1 Sep 2016
Externally publishedYes
Event33rd International Manufacturing Conference - University of Limerick, Limerick, Ireland
Duration: 30 Aug 20161 Sep 2016


Conference33rd International Manufacturing Conference
Abbreviated titleIMC33


  • Digital Mock-Up, Tolerance Design, Digital Manufacturing


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