From Astute Graphics Blog –How to Create Proper Gears Using the Dynamic Shapes Tool, PathScribe Tool and Adobe Illustrator:
I’ve seen a lot of gear wheels created by artists. Most of them have nothing to do with a real gear wheel. In this tutorial we will learn how to create gears which much closer resemble true gears. It is not hard to do if you are using the Dynamic Shapes Tool and PathScribe Tool (both part of the VectorScribe Studio plugin). Besides creating the shape, you will learn how to create a three-dimensional image and learn how to create a conic gradient. Let’s get started!