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CPK used for sheet metal parts

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  • August 3, 2004 at 9:53 pm #36387

    Taylor
    ★ 10 Years ★
    Member

    I am interested if CPK is a good method for judging quality in sheet metal parts. I am finding that it is very hard to get good cpk numbers. Any suggestions?

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    August 4, 2004 at 6:51 am #104977

    Anonymous
    ★ 20 Years ★
    Guest

    Why do you want to know the Cpk of sheet metal parts?
    Why is it hard to get good Cpk numbers? (It sounds like you get them from the supplier – a good principle that is fraught with danger.)
     

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    August 4, 2004 at 12:45 pm #104990

    Taylor
    ★ 10 Years ★
    Member

    We are being told that CPK is required to show the quality of the parts. By looking over the data. I am not sure it is a very cost effective way of showing the quality. We have some parts at are always on the high side. This makes a bad CPK. We are trying to get 1.33 cpk.

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    August 4, 2004 at 1:22 pm #104993

    Anonymous
    ★ 20 Years ★
    Guest

    Todd,
    Here are some questions to ask:
    – What are your customer’s requirements? (contractual targets and tolerances.)
    – What is the current drawing version, your version, your suppliers version, etc.
    – Are the dimensions measured correctly (relative to a datum)
    – What does your customer think about the quality of the parts? (Do you have a problem?)
    – Why are some parts always on the high side?
    – Are the parts covered in cling film plastic during the guillotine operation to avoid scratches. etc.
    Good luck,Andy
     

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