Efficient Plant March 2018 - 38

Answers to questions
facing today's reliability
& maintenance
professionals

department | on the floor

Use OEE Q
For One
A
Asset Only

Should we measure
Overall Equipment
Effectiveness (OEE)?

Dr. Klaus M. Blache
Univ. of Tennessee Reliability
& Maintainability Center
(RMC)

OEE is one of the most misused
metrics in the manufacturing world.
Used correctly, it can be a valuable
reliability-improvement tool.

The quick answer is yes, but
only if you have the discipline to
measure it correctly. OEE is one of the
most misused metrics in the manufacturing world. In simplest terms, OEE =
availability x quality x performance, on
one piece of equipment. A best-practice
OEE value in industry has been largely
promoted as 85%. Thus, it's not surprising that a high percentage of the OEE
values companies share are around
that number. But, when I ask them individually (or after the bosses leave), if
they really believe that number, many
say that they do not. Also, 85% is just
a calculated number that should really
be different by type of industry.
Many kinds of adjustments are

made to get to that magic 85% number.
Of the many factors, the most common are level of automation, age of
equipment, experience of workforce,
manufacturing difficulty of product,
levels of changeover, varying cycle time,
and type of equipment. Some of them
make some sense. Others do not. But
they all blur the focus on improving the
bottleneck..
When TPM (Total Productive Maintenance) was first introduced in North
America, OEE was intended as a way to
measure how a single piece of equipment was performing, identify areas of
improvement using the Six Big Losses
(see p. 8 in this issue), and work in small
teams to solve issues and make ongoing
improvements.
The original intent was to measure
OEE when/where you want to perform
an improvement. Somewhere along
the way, someone decided to do the
calculations on multiple machines, then
production lines, then an entire plant.
Whether it was a consultant or manager
wanting to compare operations that
took us to where we are today, it was
never the intent.

LOSSES ARE KEY
Each of the three OEE factors carries
two types of losses:
 Availability losses are breakdowns
(reactive maintenance) and setup and
adjustments.
 Quality losses are startup rejects
and production rejects/rework.
 Performance losses are small stops
and idling and process defects and
rework.

38

| EFFICIENTPLANTMAG.COM

MARCH 2018


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