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Proceedings Paper

Optimum control of quality engineering capability
Author(s): Zhe-Zhi Yi
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Paper Abstract

This paper treats of the historical origin of the contemporary model K=2 I M-i /T and Cpk=(1-K)Cp in the quality control and the essence of the mistakes in it. Early formula of the calculation of the engineering capability percentage under the condition of the deviation: K= M-j. I 1 and Cpk=Cp-K/3, does not agree with the condition of normalization. It should be negated, because their mathematical basis is wrong. Based on the condition of normalization, the writer proposes to use K= M-pc I /(2a) and Cpk=Cp-K/3 instead of the early formula. The contemporary model is equivalent to the early formula. And the contemporary model of course don't satisfy the condition of normalization, its mathematical basis inevitable must be wrong and it should be revised. The analyses about revision of the contemporary model mentioned in the papers published by the writer in recent years will apply to the early formula in principle as well.

Paper Details

Date Published: 22 September 1993
PDF: 7 pages
Proc. SPIE 2101, Measurement Technology and Intelligent Instruments, (22 September 1993); doi: 10.1117/12.156348
Show Author Affiliations
Zhe-Zhi Yi, Changsha Communications Institute (China)

Published in SPIE Proceedings Vol. 2101:
Measurement Technology and Intelligent Instruments

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