22 September 1993 Optimum control of quality engineering capability
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Proceedings Volume 2101, Measurement Technology and Intelligent Instruments; (1993) https://doi.org/10.1117/12.156348
Event: Measurement Technology and Intelligent Instruments, 1993, Wuhan, China
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.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Zhe-Zhi Yi, Zhe-Zhi Yi, } "Optimum control of quality engineering capability", Proc. SPIE 2101, Measurement Technology and Intelligent Instruments, (22 September 1993); doi: 10.1117/12.156348; https://doi.org/10.1117/12.156348

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