OEE Tracked on Percentage of
Critical Equipment
The
OEE (Overall Equipment Effectiveness) is the main benchmark for any TPM
process. If the real goal of TPM is to continuously improve equipment
effectiveness, it only makes sense that the main indicator measures equipment
effectiveness. The OEE compares the equipment availability, performance
efficiency, and quality rate. The formula is as follows:
These
are the goals for the overall equipment effectivenessindicator. There are many
factors that go beyond the scope of this material to explain. This indicator is
so flexible it can be used for daily, weekly, and even monthly time periods for
the calculation.
Strengths
This
indicator is necessary for any company beginning a TPM initiative.
Weakness
The
indicator has no weaknesses, except for misuse. It is the overall equipment
effectiveness – not the effectiveness of the overall plant, department, area,
or company. The calculation was originally intended for the operators and
maintenance personnel to track their progress toward improving the equipment.
They can hardly do this at a plant level. To be effective, this indicator must
be equipment-oriented. Other uses are drawn up by consultants wanting to make a
market for themselves.
2. Early Equipment Management and
Maintenance Prevention
Tracked on Percentage of Critical Equipment
This
indicator examines the percentage of critical equipment that has been or is
currently being studied for opportunities to make design improvements. These
improvements would reduce the maintenance requirements or the time to perform
maintenance on the equipment. The calculation is:
Critical Equipment Items Covered by
Design Studies*
Total Number of Critical Equipment Items
This
indicator is derived by dividing the number of critical equipment items covered
by the design improvement studies by the total number of critical equipment
items. The goal is 100%. When all other activities have been optimized on the
equipment, the design studies can highlight opportunities for even further
improvement.
Strengths
This
indicator is essential for any company striving to insure maximum equipment
effectiveness. This is essential because if all things are equal, changing the
design to increase throughput may make the final competitive difference.
Weaknesses
There
is no major weakness to this indicator.