Amphibians and Reptiles of the Pacific Northwest (A by R. A. Nussbaum, Edmund D. Brodie

By R. A. Nussbaum, Edmund D. Brodie

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X No amount of analysis can help a bad design get stronger or cheaper. x Remember that 80 percent of a product's cost is determined by the number of parts, assembly technique, manufacturing processes, tooling approach, materials, and tolerances. The linkages between design, manufacturing, and materials, combined with the value of reaching the customer in the least amount of time, support a robust business case for quick development of initial products. This increased effort at the start would be at a higher than optimal initial cost, but with scheduled updates and design changes would result in future improved reliability and cost while maintaining service part commonality.

Without this change, designers and manufacturing engineers will remain within their disciplines and continue to suboptimize their portion at the expense of the whole. Manufacturing Cost Modeling During conceptual design and concurrent with all other design-for-X (DfX) activities, the life-cycle cost of a product should be addressed. Twenty years ago engineers involved in the design of products may not have concerned themselves with the cost-effectiveness of their design decisions; that was someone else's job.

G. Swift, "Manufacturing Process Selection and Costing," Proceedings of the Institute of Mechanical Engineers Part B—Journal of Engineering Manufacture, Vol. 204, No. 2, pp. 143-148, 1990. 10 G. Boothroyd, P. A. , 1994. 11 C. Bloch and R. Ranganathan, "Process Based Cost Modeling," IEEE Transactions on Components, Hybrids, and Manufacturing Technologies, pp. 288-294, June 1992. K. F. Ashby, "Cost Ranking for Manufacturing Process Selection," Proceedings of the 2nd International Conference on Integrated Design and Manufacturing in Mechanical Engineering, Compiègne, France, 1998.

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