Problem 2.17

2.16 Given the figure below, operation 4 represents a rework operation on parts that fail in- spection upon completion of operation 2. 1 5000 Units 2 3 da = 5% di = 5% dz = 10% 4 da = 2% How many units must the process start with in order to meet the required output of 5000 units? DS 2.17 Given the information in Problem 2.16 and the information in the table below, how many machines are needed to perform each operation (round up to nearest integer)? Assume operations 1, 2, and 3 run for 16 hours per day, five days per week. Machine 4 is available for eight hours per day, five days per week. Operation Standard Time Efficiency Reliability 1 3 min 100% 95% 2 2 min 95% 90% 3 5 min 102% 90% 4 10 min 90% 95% Assuming that machines 1-3 are part of a dedicated manufacturing cell, that operation 4 is performed by a general-purpose machine that is used specifically for rework, and that machines needed for operation 4 are located somewhere else in the facility. Rec- ommend an alternative strategy for performing operation 4 (rework), discussing specif- ically the issues related to your strategy (use numerical results if applicable)