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Promoting Awareness in Manufacturing Students of

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2012 ASEE Annual Conference & Exposition


San Antonio, Texas

Publication Date

June 10, 2012

Start Date

June 10, 2012

End Date

June 13, 2012



Conference Session

Development of Manufacturing Engineering Laboratories I

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Page Count


Page Numbers

25.1085.1 - 25.1085.9



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Paper Authors


Merwan B. Mehta East Carolina University

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Merwan Mehta, Ph.D., is Associate Professor at East Carolina University, Greenville, N.C., in the Technology Systems Department. Prior to joining academics, he has more than 20 years of experience working as a machine tool Design Engineer, Manufacturing Engineer, Manager, Vice President, and Consultant. His present research interests are improving manufacturing productivity through lean manufacturing principles and theory of constraints, and the pursuit of quality and variation control through Six Sigma and GD&T. He has conducted sessions in value stream mapping, lean manufacturing, fixture design, and GD&T, using ANSI Y14.5 – 2009 and ISO 8015. He is a certified Manufacturing Engineer by the Society of Manufacturing Engineering (SME) and certified Six Sigma Black Belt by the American Society for Quality (ASQ).

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Utilizing Geometric Dimensioning & Tolerancing (GD&T) as a Strategic Design and Manufacturing Tool Division: Manufacturing Engineering DivisionAbstractResearch suggests that over 70% of the cost of a product is locked in once the design of aproduct is finalized, and 80% of long-term quality issues can be traced to bad design practices.One of the most essential tools that can make or break a manufacturing company in terms of thequality of products that its designers put out is geometric designing and tolerancing (GD&T).GD&T is today a strategic weapon that leading companies can use in bringing downmanufacturing costs in the assembly of interchangeable products.GD&T achieves this by allowing products that need assembly to enjoy the maximum amount oftolerance possible without undermining the functionality of the product. Simultaneously, GD&Tby providing the full spectrum of manufacturing tolerances can eliminate the need for issuingdiscrepancy waivers for accepting parts that are out of tolerances but which production peoplethink may work.GD&T through the use of the concept of zero tolerance at the maximum material virtualcondition (MMVC) for an assembled product further ensures that no good products that willfunction well in an assembly are rejected because of bad tolerancing practices. Through theconcept of zero tolerance at the MMVC, GD&T prevents the best fitting parts to not be rejected.In this paper and presentation, the central principles of GD&T will be presented as they areapplied using the ANSI Y14.5 – 2009 and the ISO 8015 standards. How special consideration tothe envelope requirement (ER) which is the default condition for ANSI Y-14.5 – 2009 standard,and the independency principle (IP) which is the default requirement for the ISO 8015 standardshould be given to these will also be presented.Participants in the session will learn how to create excellent, standard-compliant drawings,understand how to interpret and inspect geometrical requirements specified on drawings, andhow all GD&T requirements can be combined into a product designing system for bringingdown manufacturing costs of products without affecting product functionality.ASEE 2012 Annual Conference 1

Mehta, M. B. (2012, June), Promoting Awareness in Manufacturing Students of Paper presented at 2012 ASEE Annual Conference & Exposition, San Antonio, Texas. 10.18260/1-2--21842

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