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A TEMPLATE FUNCTIONAL-GAGE DESIGN USING PARAMETER-FILE TABLE IN AUTODESK INVENTOR

Cheng Y. Lin & Moustafa Moustafa Department of Engineering Technology Old Dominion University Norfolk Virginia Abstract

A systematic approach using Autodesk Inventor to design the functional gages of Geometric Dimensioning & Tolerancing (GD&T) is presented. The gages can be used to check straightness, angularity, perpendicularity, parallelism, and position tolerances of a part when geometric tolerances are specified with Maximum Material Condition (MMC). Four steps are proposed to accomplish the task: (1) creation of two-dimensional (2-D) initial template files, (2) generation of hierarchical folders for the template files, (3) creation a 3-D gage model from a specific template file, and (4) dimensioning and generation of the gage drawing. Results show that, by following this approach, students can effectively generate correct engineering drawings for functional gages.

1. Introduction of GD&T and Functional Gages

In the engineering drawing design, GD&T is a means of specifying engineering design and drawing requirements with respect to actual “function” and “relationship” of part features. If the technique of GD&T is properly applied, it will ensure the most economical and effective production of these features, and also provides a uniform integration and interpretation of design, production, and inspection for a part1,2,3. In the United States, the governing rules of using GD&T are based on ANSI 14.5M – 19944,” Dimensioning and Tolerancing”.

Functional gages are used to check the geometric tolerances of a part when its geometric tolerances are specified with MMC. Using functional gages to check geometric tolerances has the following advantages1,5:

1. Minimizes time and resources involved to verify parts. 2. Represents functional interface of the concerned features. 3. Recognizes the subtle composite effects of size, orientation, and position as a “go” and “no go” result. 4. Provides a “hard” tool, which can be utilized by anyone with reasonable technical skill; does not require a highly skilled inspector. 5. Provides alternative methods for verification other than surface plate, open set-up, coordinate measuring, etc. 6. Will never accept a “bad” part.

Proceedings of the 2004 American Society for Engineering Education Annual Conference & Exposition Copyright  2004, American Society for Engineering Education

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Moustafa, M., & Lin, C. (2005, June), A Template Functional Gage Design Using Parameter File Table In Autodesk Inventor Paper presented at 2005 Annual Conference, Portland, Oregon. 10.18260/1-2--15457