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Cp and Cpk usage

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  • #48925

    GOPAL
    Participant

    dear
    can any body tell whether its possible and correct to use Cp for unilateral tolerances(+30 but not +30 and -30) or should i use Cpk only .

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    #166194

    Lolita
    Participant

    Use  Cpk only

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    #166203

    Taylor
    Participant

    Gopal
    Cp is calculated without regard to location of the data mean within the process tolerance. This gives indication of what the process capability could perform to if the mean of the data was centered.
    With unilateral tolerance of +30 as you have stated Cp would be the KPI of choice.
    Lolita-you are two for two this morning.

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