Practical Operations Management
2nd Edition
ISBN: 9781939297136
Author: Simpson
Publisher: HERCHER PUBLISHING,INCORPORATED
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Chapter 6, Problem 18P
Summary Introduction
Interpretation:
The theoretical minimum number of workstations requires the assembly line where an assembly line must create the one finished product every 90 seconds and the sum of task time required to create a product is 295 seconds.
Concept Introduction:
The theoretical minimum number of workstations can be defined as the minimum number of workstations an assembly line or a manufacturing unit is required to produce the finished goods or to perform some specific tasks.
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An assembly line is to operate eight hours per day with a desired output of 200 units per day. The following table contains information on this product’s task times and precedence relationships:
TASK
TASK TIME(SECONDS)
IMMEDIATEPREDECESSOR
A
60
—
B
60
A
C
50
A
D
70
A
E
30
B, C
F
110
C, D
G
70
E, F
H
70
G
b. What is the required workstation cycle time to meet the desired output rate? (Round your answer to the nearest whole number.)
c. Balance this line using the longest task time. (Leave no cells blank - be certain to enter "0" wherever required.)
d. What is the efficiency of your line balance, assuming it is running at the cycle time determined in part b? (Round your answer to 1 decimal place.)
The table below shows the time for each work element in an manual assembly process, along with the predecessor(s) required for each element. The ideal cycle time is 1.4 minutes, the repositioning time is 0.1 minutes, and there is one worker at each station.
Work element
A
B
C
D
E
F
G
H
I
J
Time (minutes)
0.7
0.4
0.2
0.3
0.5
0.4
0.6
0.5
0.3
0.2
Immediate predecessors
-
A
A
B
B
C
E,F
D,E
G,H
I
1. Using the ranked positional weights method, assign work elements to stations.
An assembly line is to operate eight hours per day with a desired output of 250 units per day. The following table contains information on this product’s task times and precedence relationships:
TASK
TASK TIME (SECONDS)
IMMEDIATE PREDECESSOR
A
50
—
B
20
A
C
25
A
D
35
A
E
60
B, C
F
60
C, D
G
50
E, F
H
90
G
What is the required workstation cycle time to meet the desired output rate?
Note: Round your answer to the nearest whole number.
Balance this line using the longest task time.
Note: Leave no cells blank - be certain to enter "0" wherever required.
What is the efficiency of your line balance, assuming it is running at the cycle time determined in part b?
Note: Round your answer to 1 decimal place.
Chapter 6 Solutions
Practical Operations Management
Ch. 6 - Prob. 1DQCh. 6 - Prob. 2DQCh. 6 - Prob. 3DQCh. 6 - Prob. 4DQCh. 6 - Prob. 5DQCh. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5P
Ch. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Prob. 10PCh. 6 - Prob. 11PCh. 6 - Prob. 12PCh. 6 - Prob. 13PCh. 6 - Prob. 14PCh. 6 - Prob. 15PCh. 6 - Prob. 16PCh. 6 - Prob. 17PCh. 6 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - Prob. 24PCh. 6 - Prob. 25PCh. 6 - Prob. 26PCh. 6 - Prob. 27PCh. 6 - Prob. 28PCh. 6 - Prob. 29PCh. 6 - Prob. 30PCh. 6 - Prob. 31PCh. 6 - Prob. 32PCh. 6 - Prob. 1.1QCh. 6 - Prob. 1.2QCh. 6 - Prob. 1.3QCh. 6 - Prob. 1.4QCh. 6 - Prob. 2.1QCh. 6 - Prob. 2.2QCh. 6 - Prob. 2.3QCh. 6 - Prob. 3.1QCh. 6 - Prob. 3.2QCh. 6 - Prob. 3.3Q
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