The following represents a process used to assemble a chair with an upholstered

Question

The following represents a process used to assemble a chair with an upholstered seat. Station A, B, and C make the seat; stations J, K, and L assemble the chair frame; station X is where the two subassemblies are brought together; and some final tasks are completed in stations Y and Z. One worker is assigned to each of the stations. Generally there is no inventory kept anywhere in the system, although there is room for one unit between each of the stations that might be used for a brief amount of time.

Given the following amount of work in second required at each station.
a = 38, b = 34, c = 35, j = 32, k = 30, l = 34, x = 22, y = 18, z = 20

a. What is the possible daily output of this “process” if 8 hours of processing time is available each day?
b. Given your output rate in part a, what is the efficiency of the process?
c. What is the flow time of the process?

Explanation / Answer

The throughput time is A+B+C+J+K+L+X+Y+Z=263 263 seconds, or 263/60=4.383 minutes Possible daily output= (8hrs X 60 min. X 60 sec.) / 263 =109.5 chairs. This assumes that the manufacture of the second chair cannot start until the first chair is complete. It doesn't happen that way in real life. The second chair begins to get made the instant the first station is clear. The rate of production is as fast as the slowest station. That's station C at 35 seconds There are 8 X 60 X60 seconds in an 8-hr. day 28,800/35= 822.85 chairs. Call it 822 chairs. That's the possible. Allow for lunch and breaks, it's going to be less. B) efficiency =109.5 chairs./822.85 chairs=13.30%

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