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Difference between cpkppk

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  • #47148

    JIJU JOSEPH
    Participant

    As per the def. in this site ppk is long term process capability & cpk is short term capability. But in the second edition of SPC( AIAG Manual) cpk is the limit of natural variation and ppk is total variation(cpk+special cuase variation). Anybody canclear my doubt?

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    #156855

    SS
    Member

    Both definition are same. Actually, short term capability of a process is due to natural variation or common cause variation whereas Long term capability includes both common cause and special cause variation.

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    #156856

    Fake Gary Alert
    Participant

    Cp & Cpk are usedΒ  forΒ  short-termΒ  capability and Pp,Ppk areΒ  usedΒ  forΒ  long-termΒ  capability.Β 

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    #156859

    CT
    Participant

    Cp = Process Capability.
    Cpk = Process Capability Index. Adjust for Non-Centered Distribution
    Pp = Process Performance.
    Ppk = Process Performance Index.Β  Adjust for Non-Centered Distribution
    Ppk produces an index number (like 1.33) for the process variation. Cpk references the variation to your specification limits. If you want to know how much variation is in a process, use a Ppk measurement. If you want to know how that variation will affect the ability of your process to meet customer requirements, you should use Cpk.
    CT

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