The purpose of this session is to show participants the most significant changes that were implemented in the most recent standard for GD&T (geometric dimensioning and tolerancing). This standard, ASME Y14.5-2009, did not introduce any major characteristic symbols; however, there were numerous other additions that can significantly impact the interpretation of these tolerances. In effect, there are now more tools in the designer'S toolbox - this session will present these both in how they appear on a drawing, and what their proper interpretation and application should be. The session is intended for designers, product engineers, manufacturing engineers, manufacturing personnel, and quality/gaging inspectors, but participants should have a good general knowledge of GD&T as a prerequisite.
At the end of this session, participants will be able to:
Explain the recent history of the ASME standard
Identify the name and meaning of each of the new modifiers
Explain new terms such as irregular feature of size, related/unrelated AME
Describe other new annotations for profile such as "all over" and "non-uniform"
Identify MMB vs. MMC, and properly calculate shift tolerance
Description of the ASME standard and a quick list of new items
Review of older modifiers, with emphasis on MMB vs. MMC
Features of size: now divided into "regular" and "irregular"
Actual mating envelope: now divided into "related" and "unrelated'
The impact on Rule #1: the modifiers "CF," "I," and ISO's "E"
Applying flatness to a feature of size
New tools for profile: "unequal," "non-uniform," and "all over"
New tools for datums: the translation modifier, customized degrees of freedom, and "M" applied to a surface
Summary and questions
John-Paul Belanger is certified by the ASME as a Senior GD&T Professional. He has conducted numerous GD&T and Tolerance Stacks classes for a variety of manufacturing clients throughout North America and Europe. For four years Mr. Belanger was the primary GD&T instructor for a major automotive OEM. He has also done extensive consulting with clients in the proper application of geometric tolerancing. He holds a degree in aerospace engineering from the University of Michigan specializing in aircraft design and safety.
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