Operations Management: Processes and Supply Chains (11th Edition)
Operations Management: Processes and Supply Chains (11th Edition)
11th Edition
ISBN: 9780133872132
Author: Lee J. Krajewski, Manoj K. Malhotra, Larry P. Ritzman
Publisher: PEARSON
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Chapter 10, Problem 20P

The Mowry Machine Shop still has five jobs to be processed as of 8 A.M. today (day 23) at its bottleneck opera lion. The day when the order arrived, processing time, and promised due dates are given in the following table. The jobs are listed in the order of arrival.

Chapter 10, Problem 20P, The Mowry Machine Shop still has five jobs to be processed as of 8 A.M. today (day 23) at its

  1. Develop separate schedules by using the FCFS and EDD rules. Compare the schedules on the basis of average flow time and average days past due.
  2. Which rule gives the best schedule, in your judgment? Why?

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Three jobs are ready for processing at time zero through a workstation. The details regarding the processing time and the due date of completion is provided in the following table.   Job         Processing Time (days)              Due Date   A                            2                                                 8   B                            6                                             6   C                           5                                            13     Using the earliest due date (EDD) rule, the average tardiness of the five jobs is:
Write the Objectives of Workcenter Scheduling?
The first five columns of the following table contain information about a set of four jobs that just arrived (end of Hour 0 or beginning of Hour 1) at an engine lathe. They are the only ones now waiting to be processed. Several operations, including the one at the engine lathe, remain to be done on each job. Determine the schedule by using (a) the CR rule and (b) the S/RO rule. Compare these schedules to those generated by FCFS, SPT, and EDD. Job ProcessingTime at EngineLathe (hours) TimeRemainingUntil Due Date(days) Number ofOperationsRemaining Shop TimeRemaining(days) CR S/RO 1 2 3 4 2.3 10.5 6.2 15.6 15 10 20 8 10 2 12 5 6.1 7.8 14.5 10.2   2.46 1.28 1.38 0.78   0.89 1.10 0.46 -0.44

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