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Time
Task
(minutes)
A
10
B
11
C
5
D
4
E
12
F
3
G
7
H
11
I
3
Total time 66 480 available
Task Must Follow
m ins per day
Task Listed
Below
40 units required
—
A
Production time
B
available per day
Cycle time = Units required per day
B
A
= 480 / 40
5
C, D
= 12 minutes per unit
C
F
10
3
7
n 11
E
A ∑ Time for task F
B
G
i
Minimum
G, H
i =1
4
3
number of =
Cycle time
w orkstations 12 D 11 I = 66 / 12
E
H
= 5.5 or 6 stations
Figure 9.13 Copier Example LineBalancing Heuristics 1. Longest task time
Choose the available task
480 available
Perform ance Task Must ith the longest task time
w Follow
m ins per day
Time
Task Listed
Task . Most following tasks Below
(minutes)
40 task required
2
Choose the available units
w
number of
A
10
— ith the largest Cycle time = 12 mins
f
B
11
Aollowing tasksMinimum
C 3. Ranked positional
5
B
workstations = 5.5 or 6
Choose the available task for
D
B hich the sum of following
weight 4
w
E
12
Aask times is the longest
t
5
F
3
C, D
4. Shortest task time
Choose the available task
C
G
7
F
10
11
3
7
with the shortest task time
H
11
E
A
B
G
F
I 5. Least number of
3
G,Choose the available task
H
4
3
f time 66
with the least number of
Totalollowing tasks
D
I
12
11
following tasks
E H Table 9.4
Figure 9.13 11 4/29/2011 Copier Example
480 available
Perform ance Task Must Follow
m ins per day
Time
Task Listed
Task
(minutes)
Below
40 units required
A
10
—
Cycle time = 12 mins
B
11
A
Minimum
Station
5B
C
5
workstations = 5.5 or 6
2
CB
D
4
11
3
7
E 10
12
A
FA
B
3
C, D
F
G
4
3
G
7
F
Station 4
DE
H
11
I
I
3
G, H
12
11
Station 6
Station
Total time 66
E
H
1
Station
3 Station
5 Figure 9.14 Copier Example
480 available
Perform ance Task Must Follow
m ins per day
Time
Task Listed
Task
(minutes)
Below
40 units required
A
10
—
Cycle time = 12 mins
B
11
A
Minimum
C
5
B
workstations = 5.5 or 6
D
4
B
E
12
A
F
3
C, D
G
F ∑ Task times
Efficiency = 7
(actual number of workstations) x (largest cycle time)
H
11
E
I
3
G, H ) x (12 minutes)
= 66 minutes / (6 stations
Total time 66
= 91.7% 12 4/29/2011 Make a list of all the assembly elements
• Time for each element
• List which elements must precede the current task
• Optimize the time flow by assigning task elements to
work stations
Task
Element
1
2
3
4
5
6
7
8
9 Element
Time
(min)
0.2
.4
.7
.3
.8
.6
.2
.2
.8 Preceding
Elements Element
Description Na
1
1
2
3
3
4
4
5 Place axel on car
Place studs on axel
Lubricate axel
Place tire on wheel
Place wheel on axel 13...
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This note was uploaded on 12/29/2012 for the course ISE 543 taught by Professor Araby during the Spring '12 term at MSA University.
 Spring '12
 Araby

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