Part X requires machining on a milling machine (operations A and B are required).

Find the number of machines required to produce 3000 parts per week. Assume the company will be operating five days per week, 18 hours per day. The following information is known:

Note: The milling machine requires tool changes and preventive maintenance after every lot of 500 parts. These changes require 30 minutes.

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Operation A Standard Time Efficiency Reliability Defect Rate 3 min 95% 95% 2% B 5 min 95% 90% 5%