Illinois Furniture, Inc., produces all types of office furniture. The "Executive Secretary" is a chair that has been designed using ergonomics to provide comfort during long work hours. The chair sells for $130. There are 480 minutes available during the day, and the average daily demand has been 50 chairs. There are eight tasks:
|
Task
|
Performance Time (min)
|
Task Must Follow Task Listed Below
|
|
A
|
4
|
-
|
|
B
|
7
|
-
|
|
C
|
6
|
A, B
|
|
D
|
5
|
C
|
|
E
|
6
|
D
|
|
F
|
7
|
E
|
|
G
|
8
|
E
|
|
H
|
6
|
F, G
|
a) Draw a precedence diagram of this operation.
b) What is the cycle time for this operation?
c) What is the theoretical minimum number of workstations?
d) Assign tasks to workstations.
e) What is the idle time per cycle?
f) How much total idle time is present in an 8-hour shift?
g) What is the efficiency of the assembly line, given your answer in (d)?