Introduction: How to Assemble the Tamiya Twin-motor Gearbox - Cheap Small Robot Propulsion!
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About: Electronics are a newly re-found hobby for me. I'm not an engineer - I'm an ordinary guy who likes to tinker with electronics in his free time. You can see more about my projects at www.meanpc.com.
The Tamiya twin-motor gearbox is terrific for small robots - it's cheap (8.95 at Pololu.com) and the motors are plenty strong enough to power a small robot. You can also choose from two different gear ratios, 58:1 and 204:1. In this video, I am assembling the gearbox with a 58:1 gear ratio.
Here's the finished robot on one of the first test runs:
Here's the finished robot on one of the first test runs: