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M347
Geometric Dimensioning & Tolerancing (GD&T) and Design For Six Sigma (DFSS)

Robert P. Jackson, PE

This course is basically intended to address two distinct, but related, areas of engineering design: 1.) DESIGN FOR SIX SIGMA (DFSS) and 2.) GEOMETRIC DIMENSIONING AND TOLERANCING (GD&T). Both concepts have been viable approaches to design and detailing for some years and both are extremely valuable and useful tools for the practicing engineer. DFSS is a statistical method of design that can serve as a predictive tool to greatly improve quality control; if used properly and consistently. GD&T is a well accepted methodology of detailing the characteristics, dimensions and tolerances of a component or assembly of components. The GD&T methodology is prescribed by ASME / ANSI Standards Y 14.5M-1994 and Y14.5-2009. This course uses the tenants of 6-σ AND GD&T to fully define a mechanical component, or assembly of components, so that no more than 3.4 defects per one million parts will result when in use. DFSS and GD&T are usually taught as separate subjects but they certainly complement each other as far as design tools. It is much more difficult to achieve six sigma (6σ) results without using the DFSS approach. By using standard linear dimensioning instead of GD&T, huge errors can be made that leave room for doubt when designing tools and dies for fabrication. This will become apparent as we address GD&T. For this reason, I am structuring the course to include, and integrate, both methodologies. I would like to state that the treatment of DFSS and GD&T will be somewhat general and not in depth as far as mathematical modeling, which sometimes accompanies courses of this nature. There are excellent texts available on both subject but, none that I have found integrating both disciplines. The combination of these two is definitely a logical presentation for “blue-collar,” goal-oriented, working engineers and engineering managers.

This course includes a multiple-choice quiz at the end, which is designed to enhance the understanding of the course materials.


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NY PE & PLS: You must choose courses that are technical in nature or related to matters of laws and ethics contributing to the health and welfare of the public. NY Board does not accept courses related to office management, risk management, leadership, marketing, accounting, financial planning, real estate, and basic CAD. Specific course topics that are on the borderline and are not acceptable by the NY Board have been noted under the course description on our website.

AIA Members: You must take the courses listed under the category "AIA/CES Registered Courses" if you want us to report your Learning Units (LUs) to AIA/CES. If you take courses not registered with AIA/CES, you need to report the earned Learning Units (not qualified for HSW credits) using Self Report Form provided by AIA/CES.

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