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12. Two runs, two products, two performances (speed loss)

In this example

  • Shift time:                                       500 min
  • Production Run A:                         100 min
    •   Output 1                              80.000 (Set Speed 800 pcs/min)
    •   Output 2                              70 (Set Speed 0,7 pcs/min)
  • Production Run B:                         10 min
    •   Output 3                              7.000 (Set Speed 700 pcs/min)
    •   Output 4                               6 (Set Speed 0,6 pcs/min)
  • Waiting:                                            390 min

Result

  1. Availability 22% (110min/500min)
  2. Performance: 74% (NOT: Actual output / Maximum Output= 79%)
  3. Quality: Good Product / (Good+Rejects) = 100%
  4. OEE = 22% x 74% x 100% = 16%

Calculation

1. The performance of each product in a run is calculated

First run:

  • 80.000/100.000 = 80%
  • 70/100 = 70%

Second run:

  • 7.000/10.000 = 70%
  • 6/10 = 60%

2. The average performance for each run is calculated

  • 100 min production: (80% + 70%)/2 = 75%
  • 10 min production: (70% + 60%)/2 = 65%

3. A weighted average is calculated for the different runs

  • 100 minutes at 75% and 10 minutes at 65%:
  • ((100/110) * 75%) + ((10/110) * 65%) = 74,1%

Warning:
Just adding all actual outputs and dividing this by all maximum outputs does not give a correct performance!  
In this example it would give: 87076 / 110110 = 79,1 %  
This does not take into account that running 100 minutes at a certain speed weighs more than running 10 minutes at another speed!
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