Task
Time (sec)
A
B
C
D
E
12
15
8
5
20
Immediate
Predecessors
A
A
B,C
D
Rosenberg’s goal is to produce 180 PLA per hour
a) What is the cycle time
b) What is the teoritical minimum for the number of workstations that Rosenbertg can
achieve in this assembly line
c) Can the theoretical minimum actually be reached when workstations are assigned?
The solution of problem 9.11
a) Cycle time (in sec) =
20 /
b) Total task time = 12 + 15 + 8 + 5 + 20 = 60 sec
Minimum number of work stations =
c) Node and arrow Diagram
15 sec
secsec
B
12 sec
secsec
A
/ !
5 sec
secsec
D
20 sec
secsec
E
8 sec
secsec
C
Work
station
1
2
3
4
Activity
Time (sec)
A
B
C,D
E
12
15
13
20
We need 4 workstation to produce 180 PLA per hour
3 #$