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Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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
Transcribed Image Text:4. A metal fabrication shop has a single punch press. There are currently three parts that
the shop has agreed to produce that require the press, and it appears that they will be
supplying these parts well into the future. You may assume that the press is the critical
resource for these parts, so that we need not worry about the interaction of the press
with the other machines in the shop. The relevant information is listed below:
Part Number
Annual Demand
Setup Cost ($)
Cost per unit ($) Production Rate
per year
1
2,500
80
16
45,000
2
3
5,500
120
18
40,000
1,450
60
22
26,000
Holding costs are based on an 18 percent annual interest rate, and the products are to
be produced in sequence on a rotation cycle. Setup times can be considered negligible.
a. What is the optimal time between setups for part number 1?
b. What percentage of the time is the punch press idle, assuming an optimal
rotation cycle policy?
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