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Use of Model-Based Definition to Support Learning of GD&T in a Manufacturing Engineering Curriculum

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2017 ASEE Annual Conference & Exposition


Columbus, Ohio

Publication Date

June 24, 2017

Start Date

June 24, 2017

End Date

June 28, 2017

Conference Session

Engineering Design Graphics Division Technical Session 2: Instructional

Tagged Division

Engineering Design Graphics

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Paper Authors


Derek M. Yip-Hoi Western Washington University

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Dr. Yip-Hoi received his Ph.D. from the Department of Mechanical Engineering at the University of Michigan in 1997. His dissertation research focused on developing Computer-Aided Process Planning methods and software tools to support automation of machining on Mill/Turn machining centers. Following his Ph.D., he worked for several years with the NSF Engineering Research Center for Reconfigurable Machining Systems at the University of Michigan. His work focused on developing software applications to assist manufacturers design and plan operations on advanced machining lines that could be rapidly reconfigured to meet changes to a product’s design or production volume. In 2003 he joined the faculty of the Mechanical Engineering Department at the University of British Columbia as junior chair of the NSERC sponsored research program in Virtual Machining. His work at this time focused on the modeling of cutter/workpiece engagement geometry to support process modeling for aerospace machining applications. He is currently on the faculty of the Engineering and Design Department at Western Washington University where he is director of the Manufacturing Engineering program. His teaching and scholarship interests lie in the areas of geometric modeling, design, CAD, DFM, CAM and CNC machining.

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David Gill P.E. Western Washington University

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Dr. David Gill is an Assistant Professor of Manufacturing Engineering at Western Washington University where he specializes in CAD/CAM and CNC. Current research interests include machining of aramid honeycomb and evaluation methods for 3D printing. Prior to coming to Western, Dr. Gill was Principal Member of the Technical Staff at Sandia National Laboratories in Albuquerque, NM. At Sandia, Dr. Gill spent 7 years as a research engineer in high precision meso-scale manufacturing processes and also in Laser Engineered Net Shaping (LENS), a fully functional metal additive process. Other work at Sandia included 5 years as Thermal Energy Storage Technical Leader in the Solar Thermal Technologies organization. Dr. Gill earned his Ph.D. from North Carolina State University studying high precision optical replication methodologies, his Master's Degree in Mechanical Engineering from Purdue University developing computer aided fixture planning methods, and a BSME from Texas Tech University.

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Model-based definition (MBD) has been attracting significant attention in industry as a means for consolidating access to critical engineering information using the CAD model as a portal. One of its goals is to improve engineering efficiency and reduce the time taken to develop a product throughout its design, manufacturing and marketing phases, by integrating engineering annotations with the 3D CAD model. This contrasts with the traditional approach of providing access to this information utilizing a 2D drawing, either in paper or electronic form. Case studies have shown that MBD has the potential to significantly reduce the development time with reductions in cost. At the same time there is resistance to embracing this methodology due to the continued preference for the traditional engineering drawing as a means to communicate nongeometric information on the production floor. As industry pursues greater adoption of MBD, it is also important to consider its use in engineering design and manufacturing curricula to promote better learning of product function, and how this can be captured through the specification of Geometric Dimensioning and Tolerancing (GD&T). As engineering design and graphics instruction has embraced 3D modeling, there is an argument to be made that there is an overemphasis on developing 3D parametric modeling skills. The integration of appropriate engineering annotation such as dimensions and specification of GD&T, which require greater insight into product function than just size and shape, are often relegated to an afterthought when a drawing is generated from the 3D model. This paper presents the experiences and challenges of using MBD technology in an undergraduate manufacturing engineering curriculum for capturing design function and manufacturing requirements through GD&T. It reviews a junior level Design for Manufacture course, where advanced concepts in GD&T are introduced, and where students are required to demonstrate their grasp of these concepts by utilizing MBD. To facilitate this methodology, students receive instruction in the use of CATIA’s Functional Tolerancing and Annotation (FTA) workbench which they are required to use in their assignments and project work. In addition to allowing the integration of annotation with the 3D model, the FTA workbench provides a Tolerance Advisor that forces conformance with the ASME Y14.5-2009 standard. This tool guides students in making appropriate choices in their selection of datums, material conditions and geometry depending on the form controls applied. Finally, students are evaluated in their ability to independently apply this knowledge in a senior level Design of Tooling class. This paper will show examples of how learning is accomplished in the junior and senior classes and summarize how the use of MBD is leading to final 3D models and drawings that more fully capture the functional and manufacturing requirements of a design through appropriate use of GD&T.

Yip-Hoi, D. M., & Gill, D. (2017, June), Use of Model-Based Definition to Support Learning of GD&T in a Manufacturing Engineering Curriculum Paper presented at 2017 ASEE Annual Conference & Exposition, Columbus, Ohio. 10.18260/1-2--29066

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