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Equating uptime to sigma level

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  • #30621

    Ronan McGinley
    Member

    My project goal is to increase uptime in a manufacturing orgainsation that has seven manufacturing lines. The overall uptime in the factory is 54%, with differences between each of the lines.
    Can I equate % uptime to a sigma level, with perhaps the following rationale. 54% uptime is 46% downtime (including setup time); 46% equates to a sigma level of 1.6.
     

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    #79962

    RT
    Member

    Ron:
    Instead of trying to increase just your uptime you should look into Stable Operations.  This is a measurement that looks at daily yield based on quartiles i.e. 2nd/3rd quartile.  Once you have a high stable ops number > 90/95% then I would look at uptime.  Essentially you are reducing the variation with the Stable Operations process. 
     
    Maybe you have already done this.

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    #79999

    Ronan McGinley
    Member

    Thanks for the advice. I am not familiar with Stable Operations. Can you suggest where I can learn more about this?

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