OEE Coach Software Help
20. Multi batch, parallel output, multiple rejects
Table of Contents
20. Multi batch, parallel output, multiple rejects
In this example
- Shift time: 500 min
- Production Run A: 100 min
- Output 1 45.000 Good (Set Speed 800 pcs/min)
- 5000 rework + 1000 scrap
- Output 2 38 (Set Speed 0,6 pcs/min)
- 2 rework + 3 scrap
- Production Run B: 10 min
- Output 3 4.500 (Set Speed 700 pcs/min)
- 400 scrap + 150 rework
- Output 4 4 (Set Speed 0.9 pcs/min)
- 1 rework + 2 scrap
- Waiting: 390 min

Result
- Availability 22% (110min/500min)
- Performance: 48,2% (Weighted average!!)
- Quality: 86,28% (Weighted average!!)
- OEE = 22% x 48,2% x 86,28% = 9,15%
Performance Calculation
- The performance of each product in a run is calculated:
First run:
- (45000 good + 5000 R + 1000 S) /100.000 max = 51%
- (38 good + 2 R + 3 S)/100 max = 43%
Second run:
- (4500 good + 400 S + 150 R)/10.000 max = 50,5%
- (4 good + 1 R + 2 S)/10 = 70%
2. The average performance for each run is calculated
- First run: (51+43)/2= 47%
- Second run (50,5% + 70%)/2 = 60,25%
3. A weighted average is calculated for the different runs
- 100 minutes at 47% and
- 10 minutes at 60,25%:
- ((100/110) * 47%) + ((10/110) * 60,25%) = 48,2% performance
Warning: Just adding all actual outputs and dividing this by all maximum outputs does not give a correct performance!
Quality Calculation
- The quality of each product in a run is calculated:
First run:
- 45000 Good/ (45000 Good + 6000 Rejects) = 88,23%
- 38 Good/(38 Good + 5 Rejects) = 88,37%
Second run:
- 4500 Good /(4500 Good + 550 Rejects) = 89,1%
- 4 Good/(4 Good + 3 Rejects) = 57,14%
2. The average quality-rate for each run is calculated:
- First run: (88,23 + 88,37)/2= 88,3%
- Second run (89,1% + 57,14%)/2 = 73,12%
3. A weighted average is calculated for the different runs. For a correct result this is to be done in time:
Good product time, first run:
- (100min / 2) * ( (45000 / 100000) + (38 / 100) ) =
- 50min * (0,45 + 0,38) = 41,5 min
Good product time, second run:
- (10min / 2) * ((4500 / 10000 + (4 / 10)) =
- 5 min * (0,45 +0,4) = 4,25 min
Total good product-time:
41,5 min + 4,25 min = 45,75 min Good time
Quality Rate:
(45.75 / 53.025) * 100 = 86.28%