16-8 The following table shows orders to be processed at a machine shop as of 8:00 a.m. Monday. The jobs have different operations they must go through. Processing times are in days. Jobs are listed in order of arrival. Job A B C D E Processing Time (Days) 8 10 5 11 9 Due Date (Days) 20 18 25 17 35 Remaining Number of Operations 2 4 5 3 4 a Determine the processing sequence at the first work center using each of these rules: (1) First come, . first served, (2) Slack per operation. Sequence for First come, first served Sequence for Slack per operation b Compute the effectiveness of each rule using each of these measures: (1) average completion time, . (2) average number of jobs at the work center. (Round your answers to 2 decimal places.) First Come, First Served Average completion time Average number of jobs Slack per Operation Problem 16-17 Given the following information on job times and due dates. Job a b c d e f a1. Job Time (Hours) 3.5 2.0 4.5 5.0 2.5 6.0 Due Date (Hours) 7 6 18 22 4 20 Determine the optimal processing sequence using (1) First come, first served, (2) Shortest processing time, (3) Earliest due date, and (4) Critical ratio. Sequence for First come, first served Sequence for Shortest processing time Sequence for Earliest due date Sequence for Critical ratio a2. For each method, find the average job flow time and the average job tardiness. (Round your answers to 2 decimal places.) First Come, First Served Average flow time Average job tardiness Shortest Processing Time Earliest Due Date Critical Ratio Problem 16-18 The Budd Gear Co. specializes in heat-treating gears for automobile companies. At 8:00 a.m., when Budd's shop opened today, five orders (listed in order of arrival) were waiting to be processed. Orde r A B C D E Order Size (units) 16 6 10 8 4 Per Unit Time in Heat Treatment (minutes/unit) 4 12 3 10 1 Due Date (min. from now) 160 200 180 190 220 a If the due date rule is used, what sequence should be used? . The sequence is (Click to select)ACDBEBA CDECABEDDEACBE ABCD. b What will be the average job tardiness? (Round your answer to 2 decimal places.) . Average job tardiness c What will be the average number of jobs in the system? (Round your answer to 2 decimal places.) . Average number of jobs d Would the Shortest processing time rule produce better results in terms of average job tardiness? . (Round your answer to the nearest whole number.) (Click to select)YesNo new average job tardiness is minutes. References eBook & Resources