O.E.E. calculation
A method of calculating the overall effectiveness of a production environment, you can use to measure and optimize the efficiency of both individual machines and whole plants.
You can measure, compare and contrast the overall effectiveness of individual or groups of identical machines performing a similar function.
Example
Three different schedules produce three different parts over an eight hour shift that includes two ten minute breaks and a five minute hand over period.
Shift Data
Schedule A | Schedule B | Schedule C | |
---|---|---|---|
Part Number Built | A123 | B456 | C789 |
Cycle | 10 seconds | 45 seconds | 70 seconds |
Good Units Produced | 2240 | 450 | 229 |
Scrap Units Produced | 50 | 25 | 11 |
Unplanned Downtime | 32 minutes | 18 minutes | 22 minutes |
Scheduled Time | 480 minutes (8*60) | 480 minutes (8*60) | 480 minutes (8*60) |
Planned Down Time | 25 minutes total | 25 minutes total | 25 minutes total |
O.E.E. | Schedule A | Schedule B | Schedule C |
---|---|---|---|
Net Available Time (NAT) | 455 minutes (480-25) | 455 minutes (480-25) | 455 minutes (480-25) |
Net Operating Time (NOT) |
423 minutes
|
437 minutes
|
433 minutes
|
Ideal Operating Time (IOT) |
381.67 minutes
|
356.25 minutes
|
280 minutes
|
Lost Operating Time (LOT) |
8.33 minutes
|
18.75 minutes
|
12.83 minutes
|
Availability |
92.97%
|
96.04%
|
95.16%
|
Performance |
90.23%
|
81.52%
|
64.67%
|
Quality |
97.82%
|
94.74%
|
95.42%
|
O.E.E. |
82.06%
|
74.17%
|
58.88%
|
Where multiple products, or shifts are involved, you must apply weighting factors to the calculated results to produce statistically valid results.
Availability | |
---|---|
Schedule A | 423 minutes |
Schedule B | 437 minutes |
Schedule C | 433 minutes |
Total Net Operating Time | 1293 minutes |
Total Net Available Time | 1365 minutes |
Weighted |
|
Performance | |
---|---|
Schedule A | 381.67 minutes |
Schedule B | 356.25 minutes |
Schedule C | 280 minutes |
Total Ideal Operating Time | 1017.92 minutes |
Total Net Operating Time | 1293 minutes |
Weighted |
|
Quality | |
---|---|
Schedule A | 8.33 minutes |
Schedule B | 18.75 minutes |
Schedule C | 12.83 minutes |
Total Lost Operating Time | 39.91 minutes |
Total IOT | 1017.92 minutes |
Weighted |
|
The weighted Overall Equipment Effectiveness is:
94.73*78.73*96.08=71.66%