Position Verification in a GD&T Course: A Longitudinal Study
- Conference
- Location
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Baltimore , Maryland
- Publication Date
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June 25, 2023
- Start Date
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June 25, 2023
- End Date
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June 28, 2023
- Conference Session
- Tagged Division
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Engineering Technology Division (ETD)
- Page Count
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15
- DOI
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10.18260/1-2--43906
- Permanent URL
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https://strategy.asee.org/43906
- Download Count
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222
Paper Authors
Theodore J. Branoff
Illinois State University
orcid.org/0000-0003-3008-3436
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.
Abstract
A Geometric Dimensioning and Tolerancing (GD&T) course has been offered at [institution] since the Fall of 2016. This course was added as an elective to the Engineering Technology curriculum at the recommendation of the industrial advisory board to help give students a better understanding of dimensioning and tolerancing through the design, manufacturing, and product inspection processes. The course includes weekly study of GD&T concepts, measurement/inspection activities, and CAD modeling and drawing activities. A critical topic in GD&T is locating holes using the position tolerance rather than conventional plus/minus dimensioning. The position tolerance and position verification/inspection are covered as part of the GD&T concepts. To master position verification, students must be able to read information from a drawing and produced part, determine the maximum material condition (MMC) of a hole, determine the actual size of a hole, calculate the allowed position tolerance, determine the X & Y deviations of the hole, calculate the actual position tolerance, and make an accurate decision whether to accept or reject the position. This paper will give an overview of locating holes with the position tolerance vs. conventional tolerancing, present data from the GD&T class over a seven-year period and describe trends in student performance related to position verification.
Branoff, T. J. (2023, June), Position Verification in a GD&T Course: A Longitudinal Study Paper presented at 2023 ASEE Annual Conference & Exposition, Baltimore , Maryland. 10.18260/1-2--43906
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