1. An assembly line must be designed to produce 40 containers per hour. The following data is provided.
| Task |
Immediate Predecessor |
Task Time(sec) |
| A |
None |
60 |
| B |
A |
12 |
| C |
B |
35 |
| D |
A |
55 |
| E |
D |
10 |
| F |
E |
50 |
| G |
F,C |
5 |
a. Draw the precedence relationship network.
b. Determine potential output rate per hour (day)
c. Determine the takt time and max, bottleneck output.
d. Compute the theoretical minimum number of work stations.
e. Assign tasks to the work stations (balance the line)
f. Compute efficiency and balance delay.
| Work Station |
Eligible Tasks |
Task Selected |
Time |
Idle |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2. Presto frozen pizza company has determined that it needs an assembly line capable of producing 60 pizzas per hour. The following information is given for the company and its process.
|
Task
|
Description
|
Predecessor
|
Task time
|
|
A
|
Roll Out Dough
|
None
|
50
|
|
B
|
Place on tray
|
A
|
5
|
|
C
|
Spread tomato sauce
|
B
|
25
|
|
D
|
Spread cheese
|
C
|
15
|
|
E
|
Add meat #1
|
D
|
12
|
|
F
|
Add meat #2
|
D
|
10
|
|
G
|
Add onions
|
D
|
15
|
|
H
|
Shrink wrap
|
E, F, G
|
18
|
|
I
|
Pack in box
|
H
|
15
|
|
|
Total time=
|
165
|
|
|
|
|
a. Identify tasks, task time and precedence relationships (given above).
b. Determine potential output rate per hour (day)
c. Determine the takt time and max, bottleneck output.
d. Compute the theoretical minimum number of work stations.
e. Assign tasks to the work stations (balance the line)
f. Compute efficiency and balance delay.
|
Work Station
|
Eligible Tasks
|
Tasks selected
|
Time
|
Idle
|
|
1
|
|
|
|
|
|
2
|
|
|
|
|
|
3
|
|
|
|
|
|
4
|
|
|
|
|