30.8.2014 OEE Calculation - OEE Industry StandardOEE Industry Standard

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OEE Industry Standard

OEE Calculation

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OEE CalculationAvailabilityPerformanceQualityOEE Formula

Base

The OEE Calculation

The basis of the OEE calculation is as simple as it is brilliant; it assumes a theoretical maximumcapacity on the one hand and the actual output on the other. The first point is the point on the horizon,and the second is the current position. The genius of the OEE calculation is that it not only maps outthe loss landscape between these two points clearly and unequivocally but, more importantly, that itis also understandable to those who must make their way through it, such as the operators, technicalstaff members, engineers and so forth.

As far as is known, the OEE calculation is the only production indicator with a balance effect (that wewould normally only find in the financial world). If anything is forgotten or exaggerated, a gap willappear somewhere else.In addition, the OEE calculation combines the factors of time, speed and quality in a useful andresponsible way.

Simply put, the OEE calculations poses three questions:

The three questions

Availability

1. Is the machine operating or not?

If the machine is producing product while it was available to the production-team we know it wasrunning. At this point we do not know whether the product is good, and we know nothing about thespeed at which the machine is operating; all we know is that it is running).

The availability rate indicates the relationship between the time that the machine could theoreticallyhave been in operation (there was demand) and the time that there was actual output.

Example:

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With respect to the time that the machine is operating (in this case 75% of the shift), OEE now asksthe second question:

Performance

2. How fast is the machine running?

Say that the machine is designed to produce 10 pieces a minute, in which case you would expect tohave 3,600 pieces after 360 minutes. Of course, this is only possible if the machine performs while itis running, at 100% speed. The performance rate determines whether this is true:

In the performance rate, theoretical output is the output that the machine could have made in theoryif the machine had operated at maximum speed during the time that it actually operated.

Example:

Now the machine may have operated at high speed, but only produced products that did not meet thespecification.So when we know how long the machine ran and how fast it ran, the next question is:

3. How many products met the specifications?

Once we have measured the time and speed losses, we focus our attention on the quality of theproducts that are ultimately being made.

The relationship between the number of units produced and the number of the units produced thatmeet the specification is the quality rate.

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Quality

Example:

OEE

When we line up the answers to the three questions, the total OEE Calculation looks like this:

The OEE is calculated by multiplying the availability rate, performance rate and quality rate:

OEE = availability x performance x quality

= (B/A) x (D/C) x (F/E) x 100%Example:

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The definition of all the factors of the OEE calculation is being described in this OEE standard 2014 OEE Industry Standard All rights reserved - Fastfood theme v0.21 by TwoBeers Crew - Powered by WordPress

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