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  • #41114

    K
    Participant

    Hi,We have been asked by our customer to fill a PPAP questionnaire which includes R&R study. They have supplied us the AIAG format for performing the study.I am however not clear on the method – and would sincerely appreciate any inputs!Our products are wires of different diameters – we use a micrometer to measue the diameter. Every size has a different tolerance – based on % of size. While performing R&R study , do I have to take 10  samples of same size of wire, or 10 samples of different size wire? If I take 10 samples of same size, I get an error “less than 50% of readings are outside limit”. But if I take 10 samples of different sizes, what should I input as the tolerance??
     
     

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    #128484

    CT
    Participant

    Priya,
     It sounds like you are dealing with a P/T Ratio (precision to tolerance) To do this you will need to collect 10 samples from the same lot of wire, that cover the range of tolerance for that product (from high to low). Your tolerance will be the Customer Spec for that wire. You can use a wire that is outside the tolerance and this will help you develop different distinguishable catorgories in your study. As a Note it will be very important to measure the wire in a controlled climate, and be careful how you handle the material because body heat can cause the material to expand when handled. Also you will want to check the wire in as close to the same spot as possible. I also recommend that you have one of your appraisers be someone that is very proficient with the micrometer that can be a used as an “expert” measurer. This will help you determine appraiser error. Your current study that shows 50% may be due to the wrong c4 value or K value depending on the which format they have sent you. This number should be in a chart that is based on the number of times you measure the parts. Make sure you have the proper calculation. I recommend you measure as many times as possible, but at least 3.
    Hope this helps and let me know if I can be of more assistance
    CT

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    #128627

    Kumar
    Participant

    Priya,
    contact me in [email protected]

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