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Back To Basics: The Symbology Behind GD&T
The foundation of Geometric Dimensioning and Tolerancing lies in its use of symbols. When used in conjunction with the X-Y coordinate dimension, GD&T can help completely describe the dimensional configuration of any part.
By Mark A. Curtis, Ed.D.

Figure 1
Figure 1. An illustration of the importance of GD&T.
Figure 2
Figure 2. Symbols for the 14 control characteristics of GD&T.

Editor's Note: Dr. Mark A Curtis is currently a professor in Purdue University's College of Technology and Director of the South Bend, Ind., location. Formerly he was Dean of the College of Technology and Applied Sciences and Professor of Industrial Technologies at Northern Michigan University. He has extensive industrial and academic experience. While at Ferris State University's College of Technology, Dr. Curtis was named Distinguished Teacher of the Year and was honored by the Michigan Association of Governing Boards of State Universities as a Distinguished Faculty. This book excerpt is reprinted with permission from Industrial Press, www.industrialpress.com.

Click here to view PDF version of the Methods of Inspection for Geometric Dimensions and Tolerances.

 

Talking with readers about their critical issues, finding and training shop-floor workers tops the list nearly every time. Say readers, learning the fundamentals of manufacturing, will always have tremendous value. With this in mind, F&M offers periodic features on the bedrock principles behind metal manufacturing.

This month, we cover the basic symbology of geometric dimensioning and tolerancing. The following draws selected texts from Dr. Mark A. Curtis' book, Dimensional Management: A Comprehensive Introduction, a work that delves into far more detail than space allows for here. For more information on the book, contact Industrial Press Inc., 200 Madison Ave., New York, NY 10016-4078, 212-889-6330; Fax: 212-545-8327; www.industrialpress.com. Reprinted with permission.

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Comments

Posted by Howard Ellenburg in Boulder, CO
(04/03/10 - 01:28 PM)
GD&T basics
Extremely helpful article. Will be teaching a CAD class utilizing SolidWorks 09 at Colorado University in June and must increase my knowledge of GD&T and how to teach it in a hurry.

Will rely on the article a lot.

Any "next step/article" that continues onward in the same simple, clear manner?

h.ellenburg@colorado.edu



Posted by NITIN
(05/23/10 - 03:55 PM)
It was really informative in a clear and simple way....Thanks a lot...