1. Group 2 MECE E3409 11/15/05 Valve Design Project Erol Searfoss
Rena Rudavsky
Seth Karpinski
Jason Lichtman
MECE E3409
11/15/05

2. Design Objectives
Create a valve system that delivers air power to a pneumatic cylinder setup
Must deliver power at appropriate timing
Must have fewest parts possible
Must be cheaply and easily machined
Must produce the highest RPM and torque possible

3. 3 Design Paradigms Advantages of Cams History of CAM Decision In-Line
Cam Follower
Custom
Advantages of Cams
Historical Success
Less-complex machining (Pro-E aided)
Can design to reduce friction
Roller-Follower
Reduce shaft/housing interface

4. Close-Up

5. Side View

6. Valve Design Housing Shaft Machining Purchased shaft, then customized
Machining Hours: 1
Anodized Aluminum, $2.16
Robustness:
No tolerancing
Housing
Machining
Machined both sides at once
One position in CNC
Machining Hours: 1
Aluminum, $7.45
Minimal tolerancing
Small shaft/housing interface (low friction)

7. Valve Design Cam Mounting Bracket Back Bracket
Design: slight concavity, large diameter
Unit Cost: $ 2.59
Machining Cost: $ 62.50
Mounting Bracket
Design: mounts valve system to breadboard
Unit Cost: $ 8.54
Machining Cost: $ 50.00
Back Bracket
Design: mounts spring
Unit Cost: $ 0.13
Machining Cost: $ 37.50

8. Design and Cost Total Cost = $282.17 Design Summary
Roller Follower
Unique Cam Design
Low Friction
Simple Machining
Minimal Tolerancing
Possible Alternatives
Over-the-Counter Bracket and Back Bracket
Overall Saving: ~ 30% of total cost

9. Side View

10. Bird’s Eye View

11. Close-Up

12. Full View

13. Design and Cost Total Cost = $282.17 Design Summary
Roller Follower
Unique Cam Design
Low Friction
Simple Machining
Minimal Tolerancing
Possible Alternatives
Over-the-Counter Bracket and Back Bracket
Overall Saving: ~ 30% of total cost

14. Engine Performance Maximum Operating Speed: 458 rpm (7.73 Hz)
Maximum Torque: Lbf*in (12.2N*m)
Maximum Torque while in motion: 30Lbf*in rpm
Maximum Power kLbr*in/min
Maximum theoretical data exceeds maximum experimental data.
Why?

15. Engine Performance Cont..
Average experimental data exceeds average theoretical data.
Why?
Experimental average torque vs. angular velocity while in motion is very similar to theoretical.
Why?

16. Summary General Strengths of Design Total Cost: $282.17
Easily Machined
Fully Adjustable
Minimal Tolerancing
Minimal Friction
Total Cost: $282.17
High Speed (458 RPM)
Torque (108 lbf·in)
Ability to Run at Low RPM (240 RPM)

17. In Action
Please divert your attention to the valve system display at the front of the room

18. Questions?

19. Bill of Materials

20. Dimensions