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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- Spring '07
- Leachman
- Semiconductor device fabrication, machine type, average process time
-
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