Dimensional tolerancing technique is an effective tool to control the level of input variation sources, and furthermore reduce the variation of products. Though the development of tolerancing technologies has a long history, the issue of tolerance analysis and allocation throughout a multi-station assembly process remains under-researched. The primary focus of this paper is the tolerance allocation in a multi-station assembly process. The approach is called "tolerancing for process" as opposed to the traditional "tolerancing for product" technique. The process tolerances are optimally allocated by solving a constrained nonlinear optimization problem whose procedure is demonstrated through an industrial case study.
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