Gear Ratios

1
Gear Ratios
Charlie Haffey Norwood Public Schools
2
A Little Review
Object moved - THE LOAD Moves Load THE EFFORT
3
A Ratio
Two values related by division
Also known as..
A fraction!
4
Fractions may be written as
3
4
¾
5
Gear Size Ratio
Circumference Effort gear Circumference Load gear
6
An Example
Effort gear has 30 teeth
Load gear has 10 teeth
7
Size ratio
8
One important thing
Always leave as a fraction, even if the
denominator is 1!
9
Spin ratio
turns Effort gear turns Load gear
10
Load gear spins three (3) times
Effort gear spins one (1) time
11
Spin ratio
1 spin 3 spins
turns Effort gear turns Load gear
12
Spin ratio
Size ratio
13
Gears Are Like People
Little Ones Have To Move Faster To Keep Up
with The Big Ones
14
http//cache1.asset-cache.net/xc/101320645.jpg?v1
cIWSAssetk2d91F5CCEF208281FDE4D6FE513A5DAEA2
3BCCA476CC5EBE41C34D4AEAED6FCBB2
15
Gear Ratios
Charlie Haffey Norwood Public Schools