# Machine downtime

Six Sigma – iSixSigma Forums Old Forums General Machine downtime

Viewing 10 posts - 1 through 10 (of 10 total)
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• #50246

Andhale
Participant

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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#172704

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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#172710

Taylor
Participant

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

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#172715

Ashok
Participant

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

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#172718

annon
Participant

Any loss of availability that was not planned

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#172719

Brandon
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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#172727

Paul Gibbons
Participant

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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#172729

Taylor
Participant

Geez Paul, thats way to complicated

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#172730

Paul Gibbons
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)
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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#172733

Taylor
Participant

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

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