Experiment 2a: Planet-Free Configuration 

The calculated speed step-down ratio is (using the equations in the previous question): 

Experiment 1b: Solar-Star Configuration 

For Gear Assembly 1: Input: Ring; Output: Planet; Sun is fixed 

For Gear Assembly 2: Input: Sun, Output: Ring; Planet is fixed 

Task: Theoretically determine the step-down ratio.

The calculated speed step-down ratio (i.e. gear ratio) is: 

Experiment 1a: Solar-Free Configuration 

For Gear Assembly 1: Input: Ring; Output: Planet; Sun is fixed 

For Gear Assembly 2: Input: Sun, which is free (not engaged) 

Please watch the video on full screen before answering the question. 

Turn the Ring of Gear Assembly 1 (Input) by 1 revolution CCW and measure the direction and amount of rotation of the Sun of Gear Assembly 2 (Output) in degrees.