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Testing Implementations of Geometric Dimensioning and Tolerancing in CAD Software.

Robert R Lipman¹, James J Filliben¹

¹National Institute of Standards and Technology (NIST).

Computer-Aided Design and Applications

|October 12, 2020

Summary

This study introduces a new system from NIST to rigorously test how computer-aided design (CAD) software implements geometric and dimensional tolerances (GD&T). The findings reveal errors in CAD systems, providing a basis for future standards in GD&T application.

Keywords:

CAD software GD&T manufacturing testing tolerance

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Area of Science:

Engineering
Computer Science
Metrology

Background:

Geometric and dimensional tolerances (GD&T) are crucial for part functionality and manufacturing.
Current understanding of GD&T implementation in CAD software is limited, lacking public-domain testing.
Existing CAD software testing is typically vendor-internal or user-based, not rigorously standardized.

Purpose of the Study:

To develop and implement a system for testing GD&T capabilities in CAD software.
To identify and analyze errors in the semantic and graphical representation of GD&T within major CAD systems.
To establish a foundation for future standardized testing and evaluation of GD&T implementations.

Main Methods:

Modeled representative part geometry with GD&T applied in four major CAD systems.
Developed a testing system to evaluate GD&T implementations.
Collected and analyzed errors related to semantic and graphical presentation of GD&T.

Main Results:

Identified and documented errors in GD&T semantic and graphical representations across tested CAD systems.
Demonstrated the performance of CAD system GD&T implementations through rigorous testing.
Provided empirical data on the effectiveness and accuracy of GD&T application in CAD.

Conclusions:

The developed testing system effectively evaluates GD&T implementations in CAD software.
Significant errors exist in current CAD software's handling of GD&T, impacting manufacturing and inspection.
The results serve as a crucial basis for improving GD&T standards and testing methodologies in CAD.