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26 July, 14:52

QC. 82 The difference between the upper specification and lower specification for a sheet metal stamping process process is 0.65 cm. The standard deviation of the process is 0.13 cm. What is the process capability ratio (Cp) for this process? True/False: This process is adequately stable to meet the design specifications.

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  1. 26 July, 17:27
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    What is the process capability ratio = Cp = 0.833

    Explanation:

    From process capability (Cp) = USL - LSL / 6SD

    where SD = standard deviation, USL = Upper specification, LSL = Lower specification

    SD = 0.13, USL - LSL = 0.65

    Cp = 0.65/6x0.13

    Cp = 0.833

    Since Cp < 1, hence the process is not adequately stable, and as such, it does not meet the design specification.
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