30-05-2012, 12:46 PM
LEGO GEAR
LEGO GEARS.PPT.ppt (Size: 743.5 KB / Downloads: 45)
What is a gear?
A gear is a wheel with teeth that mesh together with other gears.
Gears change the
speed
torque (rot. force)
direction
of rotating axles.
IN LEGO:
In the LEGO Robotic System (t=tooth)
Spur gears (8t, 16t, 24t, 40t)
Crown/hybrid gears (24t)
Bevel gear (12t)
Worm gear (1t)
Rack gear
Gear Ratios
The gear ratio tells you the change in speed and torque
of the rotating axles.
If it takes 5 turns of the 8 tooth gear for every 1 turn of
the 40 tooth gear, that means the 40 tooth gear will rotate
5 times slower than the 8 tooth gear.
BUT, it also means the 40 tooth gear’s axle has 5 times
the torque (rotational force) as the 8 tooth gear’s axle.
Idler Gears
An idler gear is a gear that is inserted between 2 other gears.
Build the following. Add another
8 tooth gear to the right of the
40 tooth gear.
How many turns of the 8 tooth
gear on the left does it take to
make 1 turn of the new 8 tooth
gear on the right?