Exploring the Air Ratchet

1
Exploring the Air Ratchet

• An Adventure Brought to You by
• Brendan Doms
• On September 22, 2003
• For High Impact

2
Use

• 3/8 inch connector fits into various sockets
• used for professional assembly
• handy for households and farms
• every garage should have one

3
How
4
History

• Rotary steam engine patented with 3 vanes in
  1844 by Matthew Fletcher
• US Patent 3,833
• Major Class. 418
• Minor Class. 259

5
Speed and Torque

• Mastergrip
• 50 ft lbs of torque
• 220 RPM

• Ideally
• 80 ft lbs of torque
• 330 RPM

Determining Speed and Torque Rotation time
tsqrt(pirm/PA) Speed RPM60/(4t) Torque
tFl
6
Air

• Enters at 90 psi
• Exits at 48 psi
• Ideally Mass chokes flow at 7.0 CFM
• Mastergrip Mass chokes flow at 4.2 CFM

Determining Air Pressure and Choke Flow
Mass P2P1(2/(k1))(k/(k-1)) McrhoAVsound.
58
7
Conclusions

• Power tools dependence on rotor
• Ratchets efficiency (97)
• Air flow dynamics
• Empirical vs. theoretical data
• Units and detailed calculations
• Teamwork

8
Future Work

• Better initial understanding
• Increase complexity of model
• (e.g. include friction)
• More precise measurements

9
Acknowledgements

• Joe College, Kat Kim, Tim Hanna
• Rob Nix, Brandon Rowan
• Nate Smith, Michael Wu