1. EGR 403 Group 7 Proposal: Casting Vs. Machining Brian Jacobs Michael Mayer Noah Winsor Matthew Yeseta Oct. 23, 2007

2. Scenario We’re looking to see the better option between machining and casting of a six inch, four fin impeller.

3. Units of Comparison  Energy Cost  Insurance  Salvage  Maintenance  Operation Cost  Recycling

4. Assumptions  Price of materials fixed over period of analysis  Inflation is 3.5%  Set number of parts produced each year

5. Methodology We’re going to examine how much it would cost to set up and operate either a casting or machining operation over a 5 and 10 year period. Using our assumed inflation, we will base our analysis on the net present worth and choose the option that results in the best net present worth

6. Resources  Energy cost: from company data sheets  Insurance: contact insurance provider, EHS  Salvage: estimate % based on previous trends  Maintenance: ask campus machine shop professors and companies for averages  Operations: monstertrak for skilled and semi-skilled labor cost  Recycling: look at average and current cost of materials that can be sold back to be reused in new products