A galvanized steel shackle requires machining on two different milling machines for operations A and B. a. How many milling machines, type A and B, are required to produce 13,000 shackles per month assuming the company will be operating 5 days a week, 9 hours per day under the machine performance in the table. Tool change and maintenance are done after production:

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

a. Draw the process diagram for this problem b. CTotal milling machines type A c. Total milling machines type B

b. Compute the number of machines required if the company is considering two 9 hours shifts (instead of just one). a. Total machines type A b. Total machines type B

c. Discuss what will happen to the number of milling machines required if the machines require a 30 minutes tool changes and maintenance after a every 500 parts. Your comments in at least 25 words.