OEE

What does OEE mean?

 

Overall Equipment Effectiveness is a percentual ratio used to measure the productive efficiency of any proccess (labour, machines, or any combination of the two). Its advantage over other ratios is its ability to measure, in a single number, every parameter related to production loss: availability, speed and quality. An OEE of, say, 40%, means that for every 100 manufactured items only 40 are acceptable.

 

It contains all parameter related to production loss because by analyzing the three ratios that form OEE it is possible to understand if the loss comes from availability (production did not occur during the time it was supposed to), speed (the speed of production was not what it was supposed to) or quality (the expected quality did not coincide with the final product’s quality).

 

Edinn is focused on helping to increase the efficiency of any process. To measure the efficiency of consumption (including energy) it uses the international standard ratio OCE.

OEE calculation

 

OEE results from multiplying three other percentual ratios: Availability, Speed and Quality.

 

oee

Calculating availability

 

Availability answers the question: how much of the available time was used in production?

 

Availability results from dividing the time in which the process was under production (B) by the total time the proccess could have been in production (A). The total time the proccess could have been in production (A) is the total natural time after substracting all expected down time.

 

Availability = B / A

 

Where:
A = total process time available for production
B = time the process has been in production

 

Availability is a value between 0 and 1 and it’s usually expressed as a percentage.

ipad

Calculating speed

 

Speed answers the question: how much of the available speed has been used during production?

 

Speed results in dividing the amount of completed items (D) by the amount of potential (or expected) items produced (C). This potential amount is calculated by multiplying production time (B) by the process’ production capacity, the inverse of cycle time.

 

Speed = D / C

 

Where:
C = amount of items that could have been produced = B * nominal production speed
D = amount of produced items

 

Speed is a value between 0 and 1 and it’s usually expressed as a percentage.

Calculating quality

 

Quality answers the question: how many of the produced items have acceptable quality?

 

Quality results from dividing the amount of good items produced (F) by the total amount of production (E).

 

Calidad = F / E

 

Where:
F = amount of acceptable items produced
E = total amount of produced items

 

Speed is a value between 0 and 1 and it’s usually expressed as a percentage.

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