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Question 1
The following table lists the components needed to assemble an end item, lead times, and quantities on
hand.
If 20 units of the end item are to be assembled, how many additional units of E are needed?
138
(Refer to Chapter 12, bill of materials)
Your Name:
Question 2
A manager wants to assign tasks to workstations as efficiently as possible and achieve an hourly
output of four units. The department uses a working time of 56 minutes per hour. Assign the
tasks shown in the accompanying precedence diagram (times are in minutes) to workstations
using the following rules:
a. In order of most following tasks. Tiebreaker: greatest positional weight.
b. In order of greatest positional weight. Tie breaker: most following tasks.
c. What is the efficiency?
Desired cycle time = operating time per day/desired output rate
Number of stations = total work time / cycle time
Balance Delay = idle time per cycle/N*cycle time*100%
Efficiency = 1-balance delay
Task
A
B
C
D
E
F
G
H
I
time
3
2
4
7
4
5
6
9
5
following tasks
4
3
2
3
2
4
3
1
0
positional weight
23
20
18
25
18
29
24
14
5
a.
Work Station
1
2
3
4
Time remaining
14
9
14
7
14
12
8
14
Eligible
A,F
A
B,D,G
B,G
B
C,E
E
H,I
Assign task
F
A
D
G
B
C
E
H
Time left
9
6
7
1
12
8
4
5
Your Name:
5
I
I
0
Time remaining
14
9
14
8
5
14
10
14
5
Eligible
F
D
G
A
B
C,E
E
H
I
Assign task
F
D
G
A
2
C
E
H
I
Time left
9
2
8
5
3
10
6
5
0
b.
Work Station
1
2
3
4
Bold numbers are idle times.
c.
Balance delay = 11/56
Efficiency = 1 – balance delay = 45/56
Your Name:
Question 3
Arrange the eight departments shown in the accompanying Muther grid into a 2 × 4 format.
Note: Department 1 must be in the location shown.
Step 1. A links and X links
A
X
1-3 1-6
1-7 2-6
2-3 3-6
2-4 3-7
2-7 3-8
3-5 5-6
4-7
4-8
6-8
7-8
Step 2. Draw Cluster
A link cluster:
Your Name:
X link cluster:
Step 3. Fit in to the layout (trial-and-error)
5
3
1
2
7
4
8
6