[craigboez]

Originally Posted by Chris is me

http://team1323.com/cad/index.html should have what you need.

I second this. Also, if you download the gears in a native file format (which for me was Inventor) the original author made it incredibly easy to change the "number of teeth" user parameter and generate a new gear on the fly. For instance, I was able to download their 45 tooth DOG gear, change N Teeth to 60, and have a 60T DOG gear with minimal effort.