OEE

The edinn® M2 system is focused on improving efficiency of any process. To measure production efficiency the standard international ratio OEE is used.

 

The OEE (Overall Equipment Effectiveness) is a percentage that serves to measure the production efficiency of any process (people, machines or combinations of them).

 

The advantage of the OEE compared to other ratios is that it measures, in one indicator, all fundamental parameters referring to losses in production: availability, speed and quality.

 

Having an OEE of, for example, 40%, means that of every 100 products that could have been produced, only 40 have been produced.

 

It is said that it includes all fundamental parameters regarding losses, because out of the analysis of the three ratios that compose the OEE, it is possible to know if that what misses until 100%, is caused by availability (no production during the time that could have been used for production), speed (not produced at the speed that could have been used while producing) or quality (not produced with the quality that could have been used while producing).

 

Its beginnings are uncertain but it seems to be created by Toyota. Nowadays, it has been converted into an international standard, recognized by the main industries all over the world.

Calculation of the OEE

 

The OEE results to be the multiplier of three other percentage ratios: Availability, Speed and Quality.

 

OEE = Availability * Speed * Quality

 

Calculation of Availability

 

The Availability answers to the following question: what percentage of the available production time has been lost?

 

The Availability results to be the division of the time that the process has been producing (B) by the time the process could have been producing (A). The time that the process could have been producing (A) is the natural time minus the periods the process was not scheduled for producing for legal reasons, holidays, lunch, programmed maintenance tasks, etc.

 

Availability = B / A

 

where:

 

A = total time the process has to produce = natural time – not scheduled time to produce.

B = time the process has being producing.

 

The Availability is a value between 0 and 1 and is therefore expressed in percentages.

Calculation of Speed

 

The Speed answers to the following question: what percentage of the speed available to produce has been lost?

 

The Speed results to be the division of the number of products produced (D) by the products that could have been produced (C). The number of products that could have been produced is obtained by multiplying the production time (B) by the nominal production capacity of the machine.

 

Speed = D / C

 

where:

C = number of products that could have been produced = B * nominal production speed

D = number of products produced

 

The Speed is a value between o and 1 and is therefore expressed in percentages.

Calculation of Quality

 

The Quality answers to the following question: what percentage of the total produced products are good products?

 

The Quality results to be the division of the good produced products (F) by the total number of produced products (E).

 

Quality = F / E

 

where:

F = number of good produced products

E = total number of produced products

 

The Quality is a value between 0 and 1 and is therefore expressed in percentages.