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hw6 - IEOR 130 Methods of Manufacturing Improvement Spring...

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IEOR 130 Methods of Manufacturing Improvement Spring, 2007 Prof. Leachman Homework Problems #6 Due Tuesday, March 13, 2007 1. Data in a factory has been collected on the performance of five types of machines, as displayed in the following table. The machines are all used in the same process flow. Shown in the table for each machine type are the theoretical production time per lot ( TPT ) in hours, the number of lots ( NL ) processed, the actual production time ( PT ) in hours and the down time ( DT ) in hours. Total time for each machine type is 24 hours. Machine TPT NL PT DT Type A 1.0 20 21.0 2.5 B 1.0 21 21.5 1.5 C 0.5 38 20.0 0.5 D 0.5 36 20.0 3.0 (a) Calculate the availability, the utilization of total time and the utilization of availability for each machine type. Calculate the OEE of each machine type. Assume quality efficiency is 100% for all machine types. (b) Suppose it is possible to reduce down time by 0.5 hours per day for any of the four machine types. However, it is not possible to reduce down time for more than one of the machine types, i.e., you must pick one machine type and reduce down time of that machine type. For which one do you think it would be most beneficial to fab performance? Why? How will fab performance improve?
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