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C U control charts

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  • #40357

    AK
    Participant

    What is really the difference between C & U control charts.

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    #125041

    Go Stealers
    Participant

    Click on Control ChartsΒ from the link below.Β  It will explain the difference between C and U charts.Β  It will also show you how to draw one using Minitab if you are interested.
    http://dbar-innovations.com/general%20mfg/mfg/control.html

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    #125042

    Akram
    Participant

    The c-chart monitors the process variations due to the fluctuations of defects per item or group of items. The c-chart is useful for the process engineer to know not just how many items are not conforming but how many defects there are per item. Knowing how many defects there are on a given part produced on a line might in some cases be as important as knowing how many parts are defective. Here, non-conformance must be distinguished from defective items since there can be several non-conformances on a single defective item.
    The probability for a nonconformance to be found on an item, in this case follows a Poisson distribution.
    If the sample size does not change and the defects on the items are fairly easy to count, the c-chart becomes an effective tool to monitor the quality of the production process
    Β 
    One of the premises for a c-chart was that the sample sizes had to be the same. The sample sizes can vary when the u-chart is being used to monitor the quality of the production process and the u-chart does not require any limit to the number of potential defects
    Β 
    http://www.sixsigmafirst.com/controlcharts.htm
    Β 

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