OEE is best practices way to monitor and improve the effectiveness of your manufacturing processes (i.e. machines, manufacturing cells, assembly lines,etc...) For more details visit www.mechanicalinventors.com

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Overall Equipment Effectiveness
(OEE)

2.  OEE is a "best practices" way to monitor and improve the
effectiveness of your manufacturing processes (i.e. machines,
manufacturing cells, assembly lines).
 It takes the most common and important sources of
manufacturing productivity loss, places them into three
primary categories and distils them into metrics that provide
an excellent gauge for measuring where you are - and how
you can improve!

3.  OEE is calculated as the product of its three contributing
factors:
Availability x Performance x Quality = OEE

4.  Availability(Utilization) takes into account Down Time Loss,
which includes any Events that stop planned production for
an appreciable length of time (e.g. – material shortage,
machine failure, no tool available, tool change etc…)
Availability = Operating Time / Planned time
Operating time = Planned time – Downtime (breakdown)
Planned time = Shift length - Breaks

5.  Performance (Efficiency) takes into account Speed Loss, which
includes any factors that cause the process to operate at less
than the maximum possible speed, when running. (e.g. –
machine wear, misfeed, operator inefficiency, etc..)
Performance = Total produced pieces / (Operating time x Ideal
run rate)

6.  Quality takes into account Quality Loss, which accounts for
produced pieces that do not meet quality standards, including
pieces that require rework.
Quality = Good Pieces (Total pieces-Bad Pieces) / Total pieces

7.  These are the work class OEE factors:
 Of course every manufacturing plant is different, For example, if
your plant has an active Six Sigma quality program, you may not be
satisfied with a first-run quality rate of 99.9%
 Worldwide study indicates average OEE for manufacturing plants is
60%
OEE Factor World class
Availability 90 .00 %
Performance 95.00 %
Quality 99.99 %
OEE 85.00 %

8. Item Data
Shift length 540 min
Tea breaks 20 min
Meal breaks 60 min
Down time 135 min
Ideal run rate 30 ppm
Total pieces 5000 pieces
Reject pieces 100 pieces

9. Availability = Operating Time / Planned time
Operating time = Planned time – Downtime (breakdown)
Planned time = Shift length - Breaks
Planned time = 540 – (10+10+60) = 460 min
Operating time = 460-135 = 325 min
Availability = 325 / 460 = 70.65 %

10. Performance = Total produced pieces / (Operating time x Ideal
run rate)
Performance = 5000 / (420*30) = 39.68 %
Quality = Good Pieces / Total Pieces
Quality = (5000-100)/5000 = 98.00%

11. OEE Factor World class
Availability 70.65 %
Performance 39.68 %
Quality 98.00 %
OEE 27.47 %
Availability x Performance x Quality = OEE

12. Quality
losses
Valuable
Operating
Time
Total Production
Ideal RR X operating time
Net
Operating
Time
Speed
Losses
3. Idling and Minor Losses
(Unrecorded Downtime)
OEE Factors
Operating Time
Planned Time
Downtime
Losses
Operating
Time
2. Setup and Adjustment
Planned Time
6 Big LossesEquipment
1. Frequent Breakdowns
(Recorded Downtime)
AVALIBILITY
4. Drop in Cycle Time
PERFORMANCE
6. Start-up Scrap
5. In-process scrap
Good Pieces
Total Pieces
QUALITY

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