Wild Widget must set up an assembly line for widgets. Forecasts show that 50 units per hour should be produced. The tasks required, task times, and precedence relation- ships are as follows:
|
Task
|
Time (seconds)
|
Predecessors
|
|
A
|
10
|
-
|
|
B
|
30
|
A
|
|
C
|
15
|
A
|
|
D
|
35
|
C, B
|
|
E
|
25
|
D
|
|
F
|
10
|
D
|
|
G
|
35
|
E, F
|
a. Draw the precedence diagram.
b. What is the takt time?
c. What is the theoretical number of workstations?
d. Assign the tasks to the workstations to balance the line using the longest operating time rule.
e. What is the efficiency of the balanced line?
f. If demand decreased to 40 units per day, what changes would be needed, if any?