Product Design for Manufacture and Assembly by Geoffrey Boothroyd, Peter Dewhurst, Winston Knight

By Geoffrey Boothroyd, Peter Dewhurst, Winston Knight

Offers a precis of the analytical instruments used to judge the associated fee and hassle of producing and assembling proposed product designs, encouraging a continuing discussion among designers and production engineers through the early phases of layout.

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Also in 1992 another pilot study was carried out by the Diecasting Development Council, who used DFMA to provide a free "costing service" that gave designers and companies an estimate of the cost of using diecasting to make parts that are currently being made of sheet metal or molded plastic. To help this study the Diecasting Development Council offered to provide free in-booth diecast conversion computer cost analysis at the National Design Engineering Show in Chicago. This initiative also failed, and the problem of how to help small manufacturers reap the benefits of DFMA still remains.

However, DFMA is the subject that has been neglected over the years, while adequate consideration has always been given to the design of products for performance, appearance, etc. 100000 10000 1000 ,n a 100 10 1 10 20 30 40 50 60 Manual Assembly Efficiency (%) (DFA Index) FIG. 13 Improved assembly design efficiency results in increased reliability. , will follow when proper consideration is given to the manufacture and assembly of the product. In fact, Fig. 13 shows a relationship between the quality of a design measured by the design efficiency obtained during DFA and the resulting product quality measured in defects per million parts assembled.

Successful Implementation of Engineering Products and Processes, Van Nostrand, New York, 1994. , Wakefield, RI, 1990. DFMA Optimizes Reticle Assembly, DFMA Insight, Vol. 1, No. 3, Boothroyd Dewhurst, Inc. , Out of Harm's Way, Prod. Des. , April 1999. Product Design for Manufacture and Assembly, Engineering, January 1998. Flannery, W, Assembly System May Set Standard for Lowest Cost, St. Louis PostDispatch, October 1994. , Mission: Possible—Improving Design and Reducing Costs at Boeing Helicopter, HE Solutions, December 1997.

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