Transcription of How to Establish Manufacturing Specifications
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How to Establish Manufacturing Specifications
1 How to EstablishManufacturing SpecificationsDonald J. Wheeler1. IntroductionThe idea behind Manufacturing Specifications is to define those measurement values whichcorrespond to conforming items. That is, when the measurement falls within the manufacturingspecifications we want to be able to say that the product is within the customer Specifications . In theabsence of measurement error we could achieve this objective by simply using the customer specificationsas the Manufacturing Specifications . But when we have to make allowance for measurement error therewill need to be some gap between the Manufacturing Specifications and the customer Specifications . Howto determine the size of the gap, D, and the kind of statements that we can make about the product is thetopic of this CustomerSpecificationLimitLower CustomerSpecificationLimitLower ManufacturingSpecificationLimitUpper ManufacturingSpecificationLimitWhen theMeasurementis in herethe product is likelyto be in hereDDFigure 1: The Idea Behind Manufacturing Specific
shipping nonconforming product. When the Watershed Specifications are used as the Manufacturing Specifications you will have a likelihood of conforming product that varies from approximately 64% at a capability of 0.10 to 83% at a capability of 2.0. Another strategy for dealing with excessively tight manufacturing specifications is to use the ...
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