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Components & losses in O.E.E.
O.E.E.
(Overall equipment effectiveness)
Definition
O.E.E. is a performance indicator for productivity
O.E.E. signifies, how much equipment is utilized for production
Components of O.E.E.
O.E.E. is the result of of three varying components
Components
O.P.T. (On product time)
O.P.T.
Also known as 'Availability'
O.P.T. represents 'time' aspect of O.E.E.
O.P.T. show how much time is spent by machine to produce product
Rate
Rate
Also known as 'Performance'
Rate represents 'speed' aspect of O.E.E.
Rate show how fast machine has produced during O.P.T.
Quality
Quality
Quality represents 'Good product' aspect of O.E.E.
Quality show how much quantity of sellable product is produced by the machine
Losses in O.E.E.
Losses
There are 6 ways of losing O.E.E.
These losses are quantified in term of reduction caused by them in value of O.E.E. components- O.P.T., Rate, Quality
Losses in O.P.T.
Losses in O.P.T.
OPT loss is the biggest contributor in losses of Overall equipment effectiveness
U.D.T. (Unplanned Downtime)
U.D.T.
U.D.T. is time lost due to sudden stoppage of machine during production. It includes -:
UPMDT - Unplanned mechanical DT
UPODT - Unplanned operational DT
P.D.T. (Planned Downtime)
P.D.T.
P.D.T. is scheduled production time lost. It includes changeover, planned maintenance, CIP etc.
No plan for production?
Losses in Rate
Losses in Rate
The loss in O.E.E. which occurred due to not running of machine at maximum rated speed output
Slow speed
Slow speed
It is the O.P.T., when machine is not running at its maximum rated speed. It includes-:
- Ramp up & down
- Production start & end time
Minor stoppages
Minor Stoppages
The stoppages which are so small in duration (say seconds) that cannot be recorded as DT are minor stoppages
Losses in Quality
Losses in Quality
The quantity of product lost which is produced but not given to the customer is quality loss
Rejects & Sample
Rejects & Samples
Rejects and samples are final finished produce which are not transferred to the customer.
- Reject is due to defects
- Samples are for lab
Rework
Rework
It is the produced product which is rejected at the moment but can be corrected