Gears. Gear Types. Spur Gears (90% efficiency) . Helical / Double Helical (80% efficiency). Unequal Wheel Resistance . Equal Wheel Resistance . Differential Gearing . Rack and Pinion (90% efficiency). Worm and Pinion (70% efficiency) . Epicyclic or Planetary Gears
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Helical / Double Helical (80% efficiency)
Unequal Wheel Resistance
Equal Wheel Resistance
Rack and Pinion
Worm and Pinion
Epicyclic or Planetary Gears
Direction of Rotation – odd numbers of gears always rotates in the same direction, and even numbers of gears are counter-rotational.
EXAMPLE: For the 6 Spur Gear Train
GearRatio = Daimeter of First Gear/ Diameter of last Gear
= # of Teeth on first gear / # of Teeth on last gear = 2:1
Rotational Direstion = Counter-rotational ( Since # of Gears=6 is even)
effienciency_total = 0.9 ^ (5) = 59.1 %
FOR EFFICIENCY, DO NOT USE LONG GEARS TRAINS.
INSTEAD USE CHAIN AND SPROCKET OVER LARGER DISTANCES
For a 120 rpm motor, what size wheel should I use if I want my robot’s maximum speed to be 3 feet per second?
For the same motor, How would I make my robot’s maximum speed 6 feet per second, if 6” wheels are the largest I can fit onto my robot?
Put a gear or sprocket on the motor shaft that is half the size of the gear or sprocket on the wheel.