A manufacturer needs to produce 300 coffee pots per 8 hour day. The discrete tasks required to produce a coffee pot have been identified, timed in seconds, and ordered as indicated in the table
Sketch the precedence diagram and then assign tasks to workstations on the production line to achieve the required level of output. Break ties by assigning the longest task first. Determine the efficiency delay of your line balance.
Task Time Predecessors
A 80 --
B 25 A
C 35 A
D 20 B, C
E 50 C
F 70 E
G 45 D
H 25 G
I 15 G
J 40 F, H, I
What will be an ideal response?
Answer: The precedence diagram is shown below.
The takt time for 300 units in 8 hours is
takt time = = 96 sec/unit
Station 1 2 3 4 5
Task A C E F B D G H I J Totals
Work 80 35 + 50 70 + 25 20 + 45 + 25 15 + 40 405
Idle 15 10 0 5 40 70
Idle Time = IT = WActual CT -
IT = 5 × 95 - 405 = 70
Efficiency delay = 100% - 100% = 85.3%
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