The Pullman Mfg., Inc. three-station work cell illustrated in the figure below h
ID: 362525 • Letter: T
Question
The Pullman Mfg., Inc. three-station work cell illustrated in the figure below has two machines at station 1 in parallel. (The product needs to go through only one of the two machines before proceeding to station 2.)
The manager, Ms. Hartley, has asked you to evaluate the system if she adds a parallel machine at station 3.
a) The throughput time of the new work cell is _____ minutes (enter your response as a whole number).
b) The bottleneck time of the new work cell is ___minutes per unit (enter your response as a whole number).
c) If the firm operates 9 hours per day, 6 days per week, the weekly capacity of the work cell with the second machine at workstation 3 is ______ units (enter your response as a whole number).
d) If the firm operates 9 hours per day, 6 days per week, the weekly capacity of the work cell without the second machine at workstation 3 is ____ units (enter your response as a whole number).
20 min/unit Station 1 Machine A Station 2 Station 3 12 min/unit Station 1 Machine B 20 min/unit 6 min/unitExplanation / Answer
Station 1 has 2 machines and unit has to pass through either of these machines. The processing time is same ie 20min/unit. So in 20 minutes, 2 units can get processed which means an average of 10 minutes per unit.
Station 2 takes 6 minutes per unit.
Station 3 if it has one more machine in parallel, can process 2 units in 12 minutes which means on an average 1 unit in 6 minutes.
a) So, the throughput time in the new work cell = 10 + 6 + 6 = 22 minutes.
b) The bottleneck time of this new work cell = time spent by a unit at the bottleneck = 20 minutes spent at Station 1.
c) From a, we get time taken per unit = 22 minutes. So for 9 hours X 6 days, we have 9X6X60 minutes and the weekly capacity will be 9*6*60/ 22 = 147 units
d) Without Station 3 additional machine, in the old set up, the time taken per unit = 10 + 6 + 12 = 28 minutes. So for 9 hours X 6 days, we have 9X6X60 minutes and the weekly capacity will be 9*6*60/ 28 = 116 units
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