Midterm 2001 - IEOR 130 Methods of Manufacturing...

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IEOR 130 Methods of Manufacturing Improvement Midterm Examination Spring, 2001 Prof. Leachman Open book and notes. Work all problems. 20 points each problem. 1. In a 24-hour period, a particular photo exposure machine had 2 hours of down time. Its rate efficiency was 85 percent. It completed 35 lots, but 5 of these were run twice (i.e., 5 lots were reworked). The average process time per machine cycle was 0.5 hours. (One lot is processed per machine cycle, and a rework lot takes the same amount of time as a first-pass lot.) (a) Estimate the availability, the utilization of availability and the OEE of the machine for that 24- hour period. (b) An engineering change to the machine is under consideration. The change will reduce the rework rate to about 6 percent, but it will increase the average process time by 2 percent. Estimate what the OEE score would have been for that 24-hour period if the engineering change had been implemented. Assume the utilization of availability is held constant.
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Midterm 2001 - IEOR 130 Methods of Manufacturing...

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