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Machine downtime

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  • June 10, 2008 at 6:58 am #50246

    Andhale
    ★ 10 Years ★
    Participant

    Dear Reader,
    My question is regarding downtime of a machine on a shop floor, please tell me what are the possible downtime of a machine.
    Is lunch time/breaks considered as downtime?
    Is power cut a downtime?
    Is strike a downtime?
    Kindly list whatever you can think of for calculating downtime of a machine, or if you can suggest any URL.
    Thank you very much.

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    June 10, 2008 at 7:58 am #172704

    Michael Mead
    ★ 10 Years ★
    Participant

    Hello Deepak,
    This is always a complex question. I suggest you check this website. The author has written about defining “availability”.
    http://www.plant-maintenance.com/articles/Availability_Definition.pdf
     

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    June 10, 2008 at 1:30 pm #172710

    Taylor
    ★ 10 Years ★
    Participant

    Downtime is defined as any situation or event that is not normal to the operation of the process.

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    June 10, 2008 at 3:11 pm #172715

    Ashok
    ★ 10 Years ★
    Participant

    A downtime is one which does not yield any productivity,,,

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    June 10, 2008 at 3:29 pm #172718

    annon
    ★ 10 Years ★
    Participant

    Any loss of availability that was not planned

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    June 10, 2008 at 3:50 pm #172719

    Brandon
    ★ 10 Years ★
    Participant

    That is not correct Ashok. If you run one shift, the other 16 hours of non-production are not considered “downtime”.
    Chad got it correct. It is any non-scheduled, non-production time.
    Think about it….there is a difference.

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    June 10, 2008 at 8:55 pm #172727

    Paul Gibbons
    ★ 10 Years ★
    Participant

    How about…….
    The total non value adding time -due to unplanned plant unavailability- as a percentage of the total time when the plant was planned to be running?
    Essentially the availability element of OEE.
    Paul

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    June 10, 2008 at 8:58 pm #172729

    Taylor
    ★ 10 Years ★
    Participant

    Geez Paul, thats way to complicated

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    June 10, 2008 at 9:14 pm #172730

    Paul Gibbons
    ★ 10 Years ★
    Participant

    Wasn’t trying to be clever and on reflection think I have explained how to calculate unavailability of plant………doh (getting passed my bedtime in the UK)
    How about
    Availability = (1-(non value added/planned running time))x100?
    NVA = 50 hours
    Planned =500 hours
    (1-(50/500))x100
    (1-.1)x100
    .9×100
    90% plant available

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    June 10, 2008 at 10:36 pm #172733

    Taylor
    ★ 10 Years ★
    Participant

    Just being a SA today, since Stevo has taken the day off, someone has to pick up the slack……………..

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