The Taylor Machine shop re-bores engine blocks. Currently, three engine blocks a

Question

The Taylor Machine shop re-bores engine blocks. Currently, three engine blocks are waiting for processing. At any time, the company has only one engine expert on duty that can do this type of work. The engine problems have been diagnosed, and processing times for the jobs have been estimated. Times have been agreed upon with the customers as to when they can expect the work completed. The accompanying table shows the situation as of Monday morning. Since Taylor is open from 8 AM till 5 PM each weekday, plus weekend hours as needed, the customer pickup times are measured in business hours from Monday morning. Answer the following questions about the work waiting. (1) Calculate the sequence of work for the engines (on the worksheet) using shortest Processing Time (SPT), Earliest Due Date (EDD), and Slack Time Remaining (STR) and enter the engine name in the proper sequence for each sequencing method in the table below: (2) Calculate the mean flow time and mean lateness for this set of jobs (on the worksheet) for each of the sequencing methods from (1) and enter the values in the table below. (3) Which sequencing method do you recommend, and why?

Explanation / Answer

EDD

STR

SPT as it has least mean flow time and least mean lateness

Order processing time Due time Flow time Lateness Explorer 6 12 6 -6 Ranger 8 10 14 4 Branco 15 20 29 9 Total 29 49 7 Mean Flow time 16.33 2.33

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