The machine requires maintenance in each working day. Each maintenance takes 20 minutes. Find the number of machines required to produce 1000 parts per week with this additional information by stating your assumptions clearly.

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter12: Queueing Models
Section: Chapter Questions
Problem 59P
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The machine requires maintenance in each working day. Each maintenance takes 20
minutes. Find the number of machines required to produce 1000 parts per week with this additional
information by stating your assumptions clearly.

Part X requires operation A and operation B on the SAME MACHINE in sequence (First Operation A then
operation B are performed on the same machine). Assume the company will be operating five days per
week 8 hours per day. The following information is known:
Operation
Standard Time
Efficiency
Reliability
Defect Rate
A
3 min
95%
95%
2%
B
5 min
95%
90%
5%
lA
OA = I8
Og = 1000 parts/week
Operation A
Operation B
PA=2%
Pg=5%
Transcribed Image Text:Part X requires operation A and operation B on the SAME MACHINE in sequence (First Operation A then operation B are performed on the same machine). Assume the company will be operating five days per week 8 hours per day. The following information is known: Operation Standard Time Efficiency Reliability Defect Rate A 3 min 95% 95% 2% B 5 min 95% 90% 5% lA OA = I8 Og = 1000 parts/week Operation A Operation B PA=2% Pg=5%
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