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18. Multi batch, parallel output with rejects: entry errors

In this example

  • Shift time:                                       500 min
  • Production Run A:                         100 min
    •   Output 1                                45.000 Good (Set Speed 800 pcs/min)
    •                                                   5000 reject
    •   Output 2                                38 (Set Speed 1 pcs/min)
    •                                                   2 reject
  • Production Run B:                         10 min
    •   Output 3                                 4.500 (Set Speed 700 pcs/min)
    •                                                    400 reject
    •   Output 4                                 7 (Set Speed 1 pcs/min)
    •                                                    4 reject
  • No Data:                                           390 min

Result

  1. Availability 22% (110min/500min)
  2. Performance: 48% (Weighted average!!)
  3. Quality: 92,1% (Weighted average!!)
  4. OEE = 22% x 45,9% x 92,1% = 9,3%

Calculation of Performance

  1. The performance of each product in a run is calculated:
    • First run:
      • 50%
      • 40%
    • Second run:
      • 49%
      • 110%
  2. The average performance for each run is calculated
    • First run: (50 + 40)/2= 45%
    • Second run (49% + 110%)/2 = 79,5%
  3. A weighted average is calculated for the different runs = 48%

Warning: Just adding all actual outputs and dividing this by all maximum outputs does not give a correct performance! Also keep in mind that the Actual Output is incorrect!

Calculation of Quality

  1. The quality of each product in a run is calculated:
    • First run:
      • 90%
      • 95%
    • Second run:
      • 91,8%
      • 63,6%
  2. The average performance for each run is calculated
    • First run: (90 + 95)/2 = 92,5%
    • Second run (91,8% + 63,6%)/2 = 77,7%
  3. A weighted average is calculated for the different runs = 91%

Warning: Also the quality rate is a weighted average! Just adding all good outputs and dividing this by all actual outputs does not give a correct quality rate!

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