1. Property of Roger Cortesi, MIT Precision Engineering Research Group. DO NOT COPY or TRANSMIT without written permission. MiniMill™ Series Milling Machine Cost Estimates Precision Engineering Research Group Massachusetts Institute of Technology, Mechanical Engineering Department Phone: (617) 253-1953 Fax: (617) 258-6427 http://pergatory.mit.edu/ Room 3-470 77 Massachusetts Ave. Cambridge, MA 02139 By: Roger Cortesi rcortesi@mit.edu http://pergatory.mit.edu/rcortesi/

2. Property of Roger Cortesi, MIT Precision Engineering Research Group. DO NOT COPY or TRANSMIT without written permission. Standard MiniMill™ Prototype Component Costs Upgrading to Highest Accuracy Trucks and Rails Add $1800 (mfg $1300) Upgrading to Linear Position Encoder Add $900 (mfg $630)

3. Property of Roger Cortesi, MIT Precision Engineering Research Group. DO NOT COPY or TRANSMIT without written permission. Modified MiniMill™ Prototype Component Costs

4. Property of Roger Cortesi, MIT Precision Engineering Research Group. DO NOT COPY or TRANSMIT without written permission. Cost Comparison The motion elements in Modified MiniMill™ cost between 1.5 and 2 times as much as those in the standard MiniMill™. This there is also an increase in the cost of the carriages in the Modified MiniMill™ due to more material and machine required There the Modified MiniMill™ Also requires the added cost of clean and dry air supply. Lifetime costing and machine accuracy will decide if the added costs of the Modified MiniMill™ are justified.