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estimating scraps in a manufacturing

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  • #24127

    Liliane
    Participant

    Everyone,
    How do I go about estimating the number of pieces in a production run to not satisfy customer requirements given the following:USL: 60
    LSL: 40
    Mean: 54
    Standard Deviation: 3
    Production run: 652 piecesI know I need to use a Z-table… but I want to know how to go about it.Thank you,Liliane

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    #57776

    vaza
    Member

    First calculate ZL using minitab.
    Calc>prob distr.normal> enter the mean> enter the SD and activate the input constant > enter LS.
    Do the same with the USL.
    The outcome ZL= 0.0000015
    ZU=0.977250
    Since this is the Lower Spec Limit and Minitab gives us the area to theleft of the specified value, this will be the proportion that is below thelower spec limit.ย  It is not necessary to subtract this result from 1.0.
    ย 
    ย 
    This is the Upper Spec Limit.ย  Minitab provides us with the area underthe curve to the left of this value.ย  We need the area to the right (abovethe spec limit), so we must subtract from 1.0.

    This makes : 1-0.977250 =0.02275
    Totaal 0.02275+0.0000015=0.0227515
    Scrap : 0.0227515*652=14.83

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