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difference b/w cp and cpk , ppap apqp

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  • #41751

    Anancha perumal
    Participant

    i  need the details between cp & cpk and ppap and apqp.
     and also send some details how to prepare ppap. what is the purpose for producing ppap

    0
    #131258

    Ropp
    Participant

    Cp is your process potential, meaning that it compares your process variability with your total tolerance range.  Cpk is the same except it adds in centering.  If your process is perfectly centered around nominal Cp and Cpk would be the same.  If your process is off-center Cpk would be lower depending on how far off it is. 
     
    PPAP stands for production part approval process; APQP stands for advanced product quality planning.  I’m not extremely versed in these areas but the difference as I understand it is that PPAP is more for external vendor qualification and APQP is more for the overall goal of designing quality into the development process.
     
    Hope this helps,

    0
    #131260

    Anirvan Sen
    Participant

    To add, Cp : (USL – LSL)/6X(Sigma) and Cpk: [Centre – (one of the spec limits)]/3X

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