There is the default spur gear library that Product Online Design shows, but this guy says that GF Gear Generator is so much better.

  1. Go to this link and download it:
  2. Under Tools > GFGearGenerator > Run

It creates a body, so then right click "Body", and click "Create Component from Body".

Helical Gear Parameters

Fast Compute: Always use this unless you really need that extra precision

Module[mm]: "Module" is the unit of size that indicates how big or small a gear is. It is the ratio of the reference diameter of the gear divided by the number of teeth.

$$ ⁍ $$

$\text{Number of teeth z} * Module = \text{Diam. Pitch Circle}$

Addendum circle = pitch circle. See below: