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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.
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