Title

Assessment of Student Outcome for Geometric Dimensioning and Tolerencing (GD&T)

Document Type

Oral Presentation

Campus where you would like to present

Ellensburg

Event Website

https://digitalcommons.cwu.edu/source

Start Date

16-5-2019

End Date

16-5-2019

Abstract

Traditional curricula does not address Geometric Dimensioning & Tolerancing (GD&T). Starting with ANSI Y14.5 2014, datum and associated features were required in the design process. Manufacturing a part typically includes a ‘package’ of drawings: not just the ‘machine part’ drawing. This work focuses on developing the students understanding of GD&T in conjunction with the traditional ‘dimensioning and tolerancing’ methodology. A demonstration of how GD&T is beneficial and necessary was created. Blocks of wood with pegs or holes were used to demonstrate such GD&T concepts as, but not limited to, perpendicularity and parallelism. Two pegs in block X need to be inserted into two holes in block Y. There are a variety of dimensional tolerances that may prevent this, but let’s assume that the pegs or holes are within the tolerances specified. How does GD&T enhance the ‘dimensioning and tolerancing’ method? Even if the pegs and holes are positioned correctly, there is still the potential they won’t fit. If the pegs or holes are not parallel and perpendicular to the mating surfaces, block X will not ‘fit’ to block Y. The students were then provided with an exercise to identify such things as, but not limited to, datum, maximum material conditions, and feature control frames. The students were assessed using a rubric developed by CWU faculty. After assessing the learning of the students, it was determined that further explanation and exercises were needed for the students to fully grasp the information being presented.

Department/Program

Engineering Technologies, Safety, and Construction

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May 16th, 12:00 AM May 16th, 12:00 AM

Assessment of Student Outcome for Geometric Dimensioning and Tolerencing (GD&T)

Ellensburg

Traditional curricula does not address Geometric Dimensioning & Tolerancing (GD&T). Starting with ANSI Y14.5 2014, datum and associated features were required in the design process. Manufacturing a part typically includes a ‘package’ of drawings: not just the ‘machine part’ drawing. This work focuses on developing the students understanding of GD&T in conjunction with the traditional ‘dimensioning and tolerancing’ methodology. A demonstration of how GD&T is beneficial and necessary was created. Blocks of wood with pegs or holes were used to demonstrate such GD&T concepts as, but not limited to, perpendicularity and parallelism. Two pegs in block X need to be inserted into two holes in block Y. There are a variety of dimensional tolerances that may prevent this, but let’s assume that the pegs or holes are within the tolerances specified. How does GD&T enhance the ‘dimensioning and tolerancing’ method? Even if the pegs and holes are positioned correctly, there is still the potential they won’t fit. If the pegs or holes are not parallel and perpendicular to the mating surfaces, block X will not ‘fit’ to block Y. The students were then provided with an exercise to identify such things as, but not limited to, datum, maximum material conditions, and feature control frames. The students were assessed using a rubric developed by CWU faculty. After assessing the learning of the students, it was determined that further explanation and exercises were needed for the students to fully grasp the information being presented.

https://digitalcommons.cwu.edu/source/2019/Faculty/7