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Guard Banding for Non-Capable Gages, Part 2

Optimizing acceptance limits to minimize cost of wrong decisions

"Gauges Are A Good Thing" Credit: Adem Rudin

William A. Levinson
Tue, 08/24/2021 - 12:03
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All articles in this series
Guard Banding for Non-Capable Gages, Part 1
Guard Banding for Non-Capable Gages, Part 2
Body

Part one of this article showed that it is possible, by means of a Visual Basic for Applications program in Microsoft Excel, to calculate the fraction of in-specification product that is rejected by a non-capable gage, as well as the fraction of nonconforming product that is accepted. This calculation requires only 1) the process performance metrics, including the parameters of the distribution of the critical to quality characteristic, which need not be normal; and 2) the gage variation as assessed by measurement systems analysis (MSA).

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Part 2 of the series shows how to optimize the acceptance limits to either minimize the cost of wrong decisions, or assure the customer that it will receive no more than a specified fraction of nonconforming work.

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