In an assembly process involving six distinct operations, it is necessary to pro
ID: 393033 • Letter: I
Question
In an assembly process involving six distinct operations, it is necessary to produce 275 units per 8-h day. The measured operation times (in minutes) are as follows
1) 7.56
2) 4.25
3) 12.11
4) 1.58
5) 3.72
6) 8.44
a.) Determine the number of operators required at each work station for the given production requirement of 275 units/day, over an 8 hour day.
b.) Determine which operation is the bottlneck
c.) Determine the production line's daily output (for the 8 hour work day).
These are the answers I came up with.
a. 22 operators needed
b. operator 3 is the bottleneck
c. Im not sure?
Explanation / Answer
Answer a:
The number of operators required at each work station for the given production requirement of 275 units/day, over an 8 hour day are as below
Answer B:
Bottleneck operation is the operation of highest lead time = Operation 3 = 12.11 minutes.
Answer C:
The production line's daily output (for the 8 hour work day) for single operator = total time available / bottleneck lead time = 8*60 minutes / 12.11 minutes = 39.6 quantity per day / per operator.
Thus with single operator, the production can be achieved with the production line = 39.6 units/8h day/ operator @ bottleneck operation.
If we increase the operators as shown in the answer a , then we can achieve the productivity from the production line as 275 per day. with below number of operators per station (approximate)
Operation-1 Operation-2 Operation-3 Operation-4 Operation-5 Operation-6 Opetration Time (minutes) 7.56 4.25 12.11 1.58 3.72 8.44 Total Time (minutes)- 8 hour day 480 480 480 480 480 480 Quantity Per operator 63.5 112.9 39.6 303.8 129.0 56.9 Total Quantity Needed per 8 hour day 275 275 275 275 275 275 Total No. of operators needed 4.3 2.4 6.9 0.9 2.1 4.8 21.6 Round off Operators Needed 5 3 7 1 2 5 23.0Related Questions
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