ConformancecheckingofPMIrepresentationinCADmodel.PDF

Computer-Aided Design 66 (2015) 14–23 Contents lists available at ScienceDirect Computer-Aided Design journal homepage: /locate/cad Conformance checking of PMI representation in CAD model STEP data exchange files Robert Lipman ∗, Joshua Lubell National Institute of Standards and Technology (NIST), Systems Integration Division, 100 Bureau Drive, Gaithersburg, MD, 20899-8260, USA h i g h l i g h t s g r a p h i c a l a b s t r a c t • Geometric and dimensional toler- ances (PMI) are represented in STEP files. • Correct implementation of PMI en- sures interoperability with down- stream applications. • A software tool has been developed for conformance checking of PMI in STEP files. a r t i c l e i n f o a b s t r a c t Article history: Recommended practices supplement data exchange standards by providing common implementation Received 28 August 2014 guidance associated with specific requirements. ISO 10303 (STEP) product data exchange files that con- Accepted 10 April 2015 form to recommended practices ensure interoperability between computer-aided design (CAD) systems and with downstream applications such as manufacturing and inspection. Correct implementation of Keywords: product and manufacturing information (PMI) – annotations associated with a CAD model’s edges and CAD software faces such as geometric tolerances, dimensional tolerances