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Topic Cpk


This topic contains 8 replies, has 5 voices, and was last updated by Profile photo of MBBinWI MBBinWI 1 month, 1 week ago.

Viewing 9 posts - 1 through 9 (of 9 total)
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  • #508529 Reply

    Nancy Hall

    I have to measure 3 runs (30 samples I each run) for the validation .
    If I have:
    Run 1 cpK = 1.00 / cp = 33.72 / pp = 35.67
    Run 2 cpK = 0.451 / cp = 24.23 / pp = 26.95
    Run 3 cpK = 0.07 / cp = 20.84 / pp = 18.16
    Are they acceptable ?
    Do the cpK of 3 runs must have the same
    value to be acceptable?
    The different of the 3 cpk mean ?
    What I have to do to fix the problem?


    #508534 Reply

    Nancy — How do you think the problem can/should be solved? If you think you’re doing something wrong, why do you think that? The more details you provide, the more likely you are to get a response. The iSixSigma audience is helpful, but they like to see that someone is putting forth a good-faith effort to understand the material.

    #508559 Reply

    Nancy: I’ll do your homework, but it doesn’t come cheap.

    #508581 Reply

    I’d say you have 3 easy processes to fix! Most would love to have the tightness of variation and just a shift needed in the mean versus the closest spec.

    #514932 Reply

    @cseider – Shhhhh. I was looking to make some easy money.

    #519946 Reply

    1) Are they acceptable? They are all acceptable because cp>1

    2) Do the cpK of 3 runs must have the same
    value to be acceptable? They do not have to be the same value to be acceptable because the cp for all of them >1

    3) The different of the 3 cpk mean ? Run 1 is the worst process because it has the highest cpk, but the process is still good because cp is >1. Run 2 is in the middle because its cpk is in the middle. Run 3 is the best because it has the lowest cpk. All 3 runs are good because cp>1

    4) You don’t have to do anything because cp>1.

    Note: These answers may be wrong if the original post seems like a hw problem with no attempt made. Proceed with caution.

    #520054 Reply

    Anonymous – so, you’ll fly with a Cp=1 pilot? Take a Cp=1 pharmaceutical pill?

    You don’t have to do anything because Cp>1? But that one failure happens to be complete annihilation of humanity, but never mind reducing the incidence any further ’cause we’re already at Cp>1.

    Book smart and practical application stupid. Get some experience before you pop off.

    #520057 Reply

    I guess Anonymous doesn’t mind if the plane lands on the runway?

    #520423 Reply

    @cseider – or flies with Harrison Ford ;-}

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