Practical Management Science
Practical Management Science
6th Edition
ISBN: 9781337406659
Author: WINSTON, Wayne L.
Publisher: Cengage,
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Can i get help with question 3 and 4 please 

Microfix Inc.
Microfix Inc. has been manufacturing peripherals for microcomputers for the past decade. Over the
years, Microfix's mainstay has been hard disk drives. Because of a recent slump in sales, Microfix has
decided to expand its product line. After much deliberation among executives, engineers, production
personnel, and marketing personnel, a decision was made to produce plug-in 256 MB backup systems
for Dell laptop computers. Microfix intends to convert its hard disk expertise to plug-in expertise and to
become the cost leader for this one type of product for this one series of machines. Microfix has
performed a major analysis of machines and backup systems and feels that 1000 units per week is a
reasonable sales goal. Current operations use a standard forty-hour week, and the operations vice-
president insists that this be maintained for the new product. Developing the steps in producing the
plug-in system has been a project in itself. Engineers, production managers, and assembly line workers
collaborated to create a precedence graph and table. First, some twenty-five different steps in
production were identified. Then, the group set immediate predecessors for each task. At this point, the
line workers developed the task times, using known task times for tasks identical to current tasks,
estimates for tasks similar to current tasks, and, for some tasks, conjecture. After all of this effort, the
following assembly line table was developed.
2. Determine the theoretical minimum number of workstations
3. Balance this assembly line using the longest taks time: which tasks should be performed
workstation and in what sequence?
4. Calculate the efficiency of your solution.
which
Time (in
minutes)
1.00
Task
Immediate
Predecessors
A
None
.40
A
C
.45
D
1.10
.36
A
E
A
F
.05
None
1.32
B
H.
I
.49
.54
J
1.54
K
.35
F
L
2
G
.30
H, I
I
1.82
.89
J
P
1.20
L, M
1.30
N, O
.62
1.30
S
K
T
1.20
P, Q, R
U
1.80
V
.30
T
.87
U
X
1.20
1.90
U
V. W, X
DISCUSSION QUESTION
1. Determine the cycle time.
expand button
Transcribed Image Text:Microfix Inc. Microfix Inc. has been manufacturing peripherals for microcomputers for the past decade. Over the years, Microfix's mainstay has been hard disk drives. Because of a recent slump in sales, Microfix has decided to expand its product line. After much deliberation among executives, engineers, production personnel, and marketing personnel, a decision was made to produce plug-in 256 MB backup systems for Dell laptop computers. Microfix intends to convert its hard disk expertise to plug-in expertise and to become the cost leader for this one type of product for this one series of machines. Microfix has performed a major analysis of machines and backup systems and feels that 1000 units per week is a reasonable sales goal. Current operations use a standard forty-hour week, and the operations vice- president insists that this be maintained for the new product. Developing the steps in producing the plug-in system has been a project in itself. Engineers, production managers, and assembly line workers collaborated to create a precedence graph and table. First, some twenty-five different steps in production were identified. Then, the group set immediate predecessors for each task. At this point, the line workers developed the task times, using known task times for tasks identical to current tasks, estimates for tasks similar to current tasks, and, for some tasks, conjecture. After all of this effort, the following assembly line table was developed. 2. Determine the theoretical minimum number of workstations 3. Balance this assembly line using the longest taks time: which tasks should be performed workstation and in what sequence? 4. Calculate the efficiency of your solution. which Time (in minutes) 1.00 Task Immediate Predecessors A None .40 A C .45 D 1.10 .36 A E A F .05 None 1.32 B H. I .49 .54 J 1.54 K .35 F L 2 G .30 H, I I 1.82 .89 J P 1.20 L, M 1.30 N, O .62 1.30 S K T 1.20 P, Q, R U 1.80 V .30 T .87 U X 1.20 1.90 U V. W, X DISCUSSION QUESTION 1. Determine the cycle time.
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