iSixSigma

CPK VALUE

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  • #45759

    chhabra
    Participant

    Hi All,
    What is the target value of ppk. i am getting the ppk value arround  5 and even i got upto 23 some time. Is it ok. if not then. What should be the max value of ppk. if it too high then what we should do. Actualy i have a target based process. There is no Soecific USL and LSL. I have only target and that will be LSL. Please help.
    Thanks
    Amit

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    #150291

    Rodrigo
    Member

    Hi Amit,
    As for Ppk specifications I use the following:
    <1.33 = Bad (<4.5 sigma)
    1.33 – 1.67 = OK (4.5 – 5.5 sigma)
    >1.67 = Good (>5.5 sigma)
    A simple way of interpreting Ppk is “the higher the Ppk the better”. I am not aware of a max. value for Ppk.
    If I understood you correcly, you dont have a specific USL or LSL but you work with a target value. Perhaps you should look a Cpm instead of Ppk ( go to qualityadvisor.com)
    hope it helps

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