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Why should we improve this process?

Six Sigma – iSixSigma Forums Old Forums General Why should we improve this process?

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  • #44087

    Rodders
    Member

    Hello,
    I was just asked by a colleague:
    “why the hell are we going to improve this process if we are producing well within specification?” (while looking at the control chart)
    By “this process” the person was refering to a process with the following characteristics:
    Xbar&S chart, 29 subgroups with each subgroup having 10 units.
    USL= 115.0    UCL= 102.8
    LSL= 85.0       LCL= 97.6
    Normal Distribution
    PPK= 1.5
    7 points (out of 29) outside UCL and LCL.
     
    I was unable o answer why we should improve a process that is out of control( statistical) but well within specification.
     
    Some help in answering this person (and I forsee many others) would be great.
    Thanks
     
    Rodders
     
     

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    #140789

    Mikel
    Member

    Do your own homework

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    #140791

    Haugen
    Participant

    Rodder – you answered your own question in your next to last sentence – just reverse the order of the sentence.  Your current samples are within specification, but the process is out of control, so you have no way of predicting if you will continue to produce within spec.  You need to address the special causes so that you can bring the process back under control, and can therefore predict the capability of your process to produce in-spec parts.

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    #140792

    Jered Horn
    Participant

    Pick up a copy of “Understanding Variation – The Key to Managing Chaos” by Donald J. Wheeler, Second Edition.  It’s a very quick read and will answer your question(s).

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    #140797

    Rodders
    Member

    Thanks guys, I appreciate your help:)
    Stan, u suck.

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    #140798

    Mikel
    Member

    Rodders,
    It’s a homework problem. I recognize it. The answer is within 20 pages of where the probelm is printed.
    Not only do u suck, but you are lazy too.

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    #140805

    Martínez
    Participant

    Read “Taguchi’s Loss Function”
    A google search will give you everything you need
    The thing to remember is that even an in control and in spec process can still cost you and can always be improved

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