15GearReduction

# 15GearReduction - gear, the worm creates an n-to-1...

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Working with your Robot: Gearing Comp 106 Gear Reduction • What is it?

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Gear Reduction • When the 8–tooth gear rotates 3 times, it advances the meshed gear by a total of 24 teeth. • Since the meshed gear has 24 teeth, it rotates exactly once. • This is a 3:1 ratio of gear reduction: three turns of the input gear causes one turn of the output gear. Gear Reduction • How to make a 9:1 ratio of output reduction?
Gear Reduction • By ganging together two 3-to-1 gear reductions, a 9-to-1 output reduction can be achieved. • The key is to use intermediary shafts that hold large input gears (e.g., a 24–tooth) and small output gears (e.g., an 8–tooth). A LEGO Geartrain

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A LEGO Geartrain • A five-stage reduction using 8– and 24– tooth gears. • Can you find out the ratio of gear reduction in this gear train? The Worm Gear • A fascinating invention.
The Worm Gear • When meshed with a conventional round

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Unformatted text preview: gear, the worm creates an n-to-1 reduction: each revolution of the worm gear advances the opposing gear by just one tooth. It takes 24 rotations of the worm to revolve the 24tooth round gear once. The Worm Gear The worm gear loses a lot of power to friction, so it may not be suitable for high performance, main drive applications. If your robot is too heavy, a worm gear drive may not work well as its main drive. Worm Gear cant be back-driven. Is this property useful? Changing Axis of Rotation The Crown Gear The 8tooth gear, in conjunction with the 24-tooth crown gear , is used to change the axis of rotation in a gear train Changing Axis of Rotation The Bevel Gear To change the angle of rotation of shafts in a gear train with a 1:1 ratio. In the example below, they are used to effect a change in the horizontal plane...
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## 15GearReduction - gear, the worm creates an n-to-1...

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