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Students’ Understanding of Datum Reference Frame Concepts in a GD&T Course: Student Outcomes Across Multiple Semesters

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2020 ASEE Virtual Annual Conference Content Access


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Publication Date

June 22, 2020

Start Date

June 22, 2020

End Date

June 26, 2021

Conference Session

Engineering Design Graphics Division Technical Session 5

Tagged Division

Engineering Design Graphics

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Paper Authors


Theodore J. Branoff Illinois State University

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Dr. Branoff is a professor and chair of the Department of Technology at Illinois State University. He taught engineering graphics, computer-aided design, descriptive geometry, and instructional design courses in the College of Education at North Carolina State University from 1986-2014. He also worked for Siemens-Switchgear Division and for Measurement Group, Inc. Dr. Branoff's research interests include constraint-based solid modeling strategies and spatial visualization abilities in undergraduate students. He has conducted CAD and Geometric Dimensioning and Tolerancing workshops for both industry and education professionals. Dr. Branoff served as President of the International Society for Geometry and Graphics from 2009-2012. In 2013 he was elected into the Academy of Fellows of the ASEE, and in 2014 he received the Distinguished Service Award from the Engineering Design Graphics Division of ASEE. In April of 2015 Dr. Branoff received the Orthogonal Medal for distinguished service in graphic science from the Technology, Engineering & Design Education faculty at North Carolina State University.

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Kevin L. Devine Illinois State University

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Kevin is the Program Coordinator for the Engineering Technology major at Illinois State University. His primary teaching assignments are in engineering graphics, industrial robotics, and CNC programming/machining.

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TEC333 Geometric Dimensioning and Tolerancing addresses two of the overall program outcomes in the [program name] program at [institution]. These outcomes include utilizing 2-D and 3-D computer-aided design systems to create drawings and models for products, machines, jigs, fixtures, and other mechanical devices used in manufacturing environments and being able to read and interpret manufacturing documentation such as blue prints, technical drawings and diagrams, production plans, tooling plans, quality plans, and safety plans. One of the key outcomes of TEC333 is that students can apply appropriate datum reference frames to designs. Students are asked to demonstrate their understanding of the datum reference frame concepts in several ways throughout the course on a pretest, tests, online quizzes, modeling & drawing assignments, CMM assignments, and the final exam. Specific examples include labeling a datum reference frame origin on a given drawing, sketching datum feature symbols on a drawing given sentence descriptions of the datums, identifying established datums when given a drawing, modeling parts with the datum reference frames consistent with the datum reference frame on a given drawing, and designing datum reference frames for parts within a given assembly. This paper will present ways students are assessed on datum reference frame topics, present the results of these assessments over the last several years, and provide recommendations for future work.

Branoff, T. J., & Devine, K. L. (2020, June), Students’ Understanding of Datum Reference Frame Concepts in a GD&T Course: Student Outcomes Across Multiple Semesters Paper presented at 2020 ASEE Virtual Annual Conference Content Access, Virtual On line . 10.18260/1-2--35250

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