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ASQ

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  • October 7, 2004 at 7:35 pm #37138

    Yanet
    ★ 10 Years ★
    Member

    Hi all,
    I have a question: in my Company, we inspect 100% of the custom products made by subcontractors.  I need to know what level of inspection would be ok to still have confidence on good quality of the least expensive product line.  We are doing 30 percent, but I would like to know whether it is accurate or not and what should be.    Certainly I an in a hurry since my boss wants this answer for tomorrow.  I appreciate your answers very much.
    Thanks,
     
    Yanet.
     

    0
    October 7, 2004 at 8:51 pm #108711

    Bruce Hudson
    ★ 10 Years ★
    Participant

    Hi,
     
    I undrestand that the sample size has nothing to do with the confidence level.

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    October 7, 2004 at 9:02 pm #108712

    PB
    ★ 10 Years ★
    Participant

    Yanet,
    What is your population size? What is your AQL level? What is the acceptable ‘alpha’ and ‘beta’ risks? What are your accept/reject levels?
    With that info, you can look up the ANSI tables for sample size.
    PB

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    October 7, 2004 at 10:32 pm #108717

    Mike Carnell
    ★ 20 Years ★
    Participant

    Yanet,
    There is no such thng as 100% inspection. Call it what it is – you are sorting.
    The most logical answer is to get good suppliers with capable processes and you won’t have to look at any of it.
    Good luck

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    October 8, 2004 at 6:59 am #108722

    Dog Sxxt
    ★ 10 Years ★
    Participant

    I did deal with a supplier from Thailand. I have recommended to top managemet to disqualify this supplier because my ex-company’s offshore plant has to add six operators to do so-called “100%” incoming inspection.
    A Quality Planning book by Juran & Gyna will tell you the operator maual inspection effectiveness is hanging around 85-95% if my memory is not rusty to capture the figure.
    Japanese customers will tell you zero defect is only goods they are interested to buy from you. Tell your boss that no inspection shall be borne by your company.

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