Assignment:
Q: In a production cell dedicated to the production of a product family, the following data corresponding to 10 working days have been obtained (the working time is 24/7). The theoretical production was 90 units per day.
|
Day
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|
Breakdowns (h)
|
3
|
1
|
2
|
|
1
|
1
|
2
|
|
5
|
|
|
Setup time (h)
|
|
4
|
|
|
|
4
|
|
|
|
4
|
|
Defects (units)
|
6
|
7
|
5
|
3
|
5
|
3
|
3
|
6
|
4
|
3
|
|
Total production (units) 88 70 78 83 80 60 83 77 75 79
|
After a maintenance improvement project, it was decided to make a daily planned stop of 2 hours to carry out preventive maintenance tasks. After 10 working days, the following data were collected:
|
Day
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|
Breakdowns (h)
|
1
|
|
|
|
2
|
|
|
|
3
|
|
|
Setup time (h)
|
|
4
|
|
|
|
4
|
|
|
|
4
|
|
Defects (units)
|
5
|
8
|
3
|
4
|
3
|
5
|
3
|
2
|
2
|
7
|
|
Total production (units)
|
77
|
72
|
77
|
80
|
70
|
75
|
80
|
72
|
77
|
75
|
1. How has this changed the overall equipment efficiency (OEE) rate?
2. Was the project worthwhile? Why?