Geneva Wheel, Worm Gear, Screw Mechanismengineering.armstrong.edu/cameron/4Forcemen.pdf · Geneva...
Transcript of Geneva Wheel, Worm Gear, Screw Mechanismengineering.armstrong.edu/cameron/4Forcemen.pdf · Geneva...
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Mechanisms Geneva Wheel, Worm Gear, Screw Mechanism
By Four Force Men: Cody Vlaun
Travis Carroll Dillon Hanni David Klein
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Geneva Wheel
• Originally invented by a watch maker to convert continuous rotational movement to intermittent rotational movement.
• One of the most commonly used mechanisms for intermittent rotation due its low cost and good performance.
• Three types: Internal, External, and Spherical
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Geneva Wheel (External)
• Driver continuously rotates
• Drive Pin enters the drive slot and rotates output 90 degrees.
• Held in place by locking surface
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Internal Spherical
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Video Demonstration Geneva Wheel
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Geneva Wheel advantages
Advantages
• Available in a wide variety of sizes.
• Maintains good control of its load at all times.
• Have little wear leading to a very long life span
Disadvantages
• Limited number of dwells from 3 to 18 per rotation.
• Has a greater instantaneous change of acceleration than a cam mechanism.
• Very difficult to change timing once design is chosen.
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Geneva Wheel Film Projector
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Geneva Wheel Clock
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Worm Gear
• Used when large gear reductions are needed.
• Changes axis of rotation
• Changes angular velocity
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Video Demonstration Worm Gear
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Fishing reel
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RC cars
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Machining Base
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Screw Mechanism • Converts rotational motion to linear motion by
converting torque (rotational force) to linear force.
• Lead: the linear distance that is traveled after one full rotation.
• Pitch: The axial distance between the threads.
• Screws have a self locking property.
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Video Demonstration Screw Mechanism
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Advantages
• Small rotational forces can exert large axial forces.
• Screws have a high mechanical advantage (ratio of output force to input force).
• Simple design that can be very cost effective.
Disadvantages • Frictional energy losses
due to the large contact area between the threads.
• Amount of work out is far less than the input work due to the work transformed into heat by friction.
• Jack screws typically only have 15%-20% efficiency.
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Archimedes Screw
Used to transport water to higher elevations.
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Vise