Making amazing wooden gears
From his description:
There are no paper patterns to glue to wood and saw around, the correct involute tooth profile is automatically generated. This technique is very simple once you see how it works. There is no need for expensive cnc routers or lasers or any computer-controlled tools. If you have a scrollsaw or tablesaw, the ability to cut accurately sized circles from plywood, and a computer - then you can do this. You won't find this technique anywhere else, I have looked thoroughly and know it is my own original idea.
Visit his web site at http://www.stevengarrison.com/ from that home page click on the "gears" link to purchase Steve's technique. The price is $30.