Guide
cont.
G.9
Mechanisms Gear Ratio Exercise #3: Gear Trains and Idler Gears
(Grades 6-8)
Student Name(s):
Teacher/Class: Date:
Instructions:
After learning about Gear Trains and Idler Gears from G.3, demonstrate what you have learned
by calculating and writing in correct answers. You may also build and use the VEX IQ Gear Ratio
Simulator along with 12-tooth, 36-tooth, and 60-tooth gears to help nd answers.
Driving Gear
(Input)
Idler Gear Driven Gear
(Output)
Gear Ratio Gear Reduction Simplied Gear
Reduction
36-tooth 60-tooth 36-tooth
: / /
12-toot h 36-tooth 60-tooth
: / /
36-tooth 12-tooth 60-tooth
: / /
12-toot h 36-tooth 36-tooth
: / /
12-toot h 36-tooth
and 36-tooth
60-tooth
: / /