1. 30 March 2005Safety Lock Mailbox1 Safety Lock Mailbox ME 4182: A-Team Week 11: Prototype Production Carlos Alzate Brian Dorton Song Park Varun Sharma Jack Vasko Adam Zurawski

2. 30 March 2005Safety Lock Mailbox2 Presentation Overview Updated Engineering Analysis Updated Prototype Prototype Production Plans

3. 30 March 2005Safety Lock Mailbox3 Engineering Analysis

4. 30 March 2005Safety Lock Mailbox4 3-D Design

5. 30 March 2005Safety Lock Mailbox5 2-D Design

6. 30 March 2005Safety Lock Mailbox6 Floor Mechanical Analysis – Continuous Sheet Minimum Bending Radius Assumptions Sheet is in pure bending Parameters Result Material: Aluminum Alloy 2024

7. 30 March 2005Safety Lock Mailbox7 Floor Mechanical Analysis – Continuous Sheet Bending Force Assumptions The forces on the sheet act as shown in the diagram The radius of curvature can be approximated as Ro Castigliano’s Theorem (Strain Energy Method)

8. 30 March 2005Safety Lock Mailbox8 Floor Mechanical Analysis – Continuous Sheet Force to Move Floor (when almost totally retracted) Parameters Result

9. 30 March 2005Safety Lock Mailbox9 Floor Retraction Force: Hinged

10. 30 March 2005Safety Lock Mailbox10 Linkage and Door Force Analysis

11. 30 March 2005Safety Lock Mailbox11 Position Analysis for the linkage A BC D l1l1 l3l3 l2l2 x y

12. 30 March 2005Safety Lock Mailbox12 Position Analysis for the linkage

13. 30 March 2005Safety Lock Mailbox13 Updated Prototype Tracks –Will construct out of wood due to high cost of teflon ($60 for 6”x6”x.5”) Closing Floor –Hinges –Chrome/Nickel Plated Lower Box –Scrap Sheet Metal

14. 30 March 2005Safety Lock Mailbox14 Prototype Production Plans

15. 30 March 2005Safety Lock Mailbox15 Prototype Timeline

16. 30 March 2005Safety Lock Mailbox16 Team Build Dates @ Brian’s House or MRDC Week 1 (4/30 – 5/6) –Friday 5/1 –Saturday 5/2 –Monday 5/4 Week 2 (5/6 – 5/13) –Friday 5/8 –Saturday 5/9 –Monday 5/11 Week 3 (5/13 – 5/20) –Friday 5/15 –Saturday 5/16 –Monday 5/18 Week 4 (5/20 – 5/27) –Friday 5/22 –Saturday 5/23 –Monday 5/25

17. 30 March 2005Safety Lock Mailbox17 Future Plans Build Exterior of mailbox Secure prototype materials Begin preliminary work on final presentation, paper, and poster

18. 30 March 2005Safety Lock Mailbox18 Questions?