Overall equipment effectiveness - Computing OEE taking all machines taken together

A

Andrews

We are computing OEE taking all machines that we have inhouse together. Setting time, breakdown hrs., etc are taken for all machines together and a single OEE is computed. Is this right? or should we compute for only the contsraint machine.
 

Marc

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Leader
I would be looking at each machine. You may have a process where you have recognized a 'constraint' machine and bought a second one or something like that. I don't know how you could do a single OEE without having data on each machine/operation/etc.
 
P

peteroldfield1971

You could measure this in 2 ways. First, calculate OEE for individual machines. Then use these figures to calculate plant efficiency. This would highlight individual machine concerns. You could have a plant efficiency at 75% but this would not show that 2 machines could be running at different levels of efficiency. So in effect one machine could be carrying the other. I guess its all down to the amount of time and effort you can put into it each week/month and what data is available.

I have attached an example of the difference in machine efficiency and plant efficiency for you to review.
 

Attachments

  • Overall Equipment Effectiveness Sample.xls
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R

Randy Stewart

If you are using OEE to establish throughput, you are making it more difficult to identify bottle necks by lumping all equipment together.

What I have found to be very beneficial in the past has been to do a Value Stream Map before applying the OEE calculations. It identifies restraints and then you can put actual numbers on how the restraints are detrimental to the process.
 
A

Andrews

Thanks everyone for the response.

Randy,
What does value stream map mean? Kindly explain.
 
K

konradw

Re: Overall equipment effectiveness - Computing OEE taking all machines taken togethe

Hi, is there any link explaining the theoretical correlations between availability, performance, quality - so when I improve e.g. availability, which impacts does this have on performance and quality? thanks a lot
 
W

wmarhel

Re: Overall equipment effectiveness - Computing OEE taking all machines taken togethe

That isn't the point ot OEE, to determine some correlation. The purpose of OEE is to:

1) Be used as a baseline for tracking progress
2) Identify the biggest area of opportunity

Just take it for what it is, as it isn't meant to be an exercise in stastical analysis.

Wayne
 
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