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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:



 

<p>I don't get any audio in the video and your hands frequently leave the screen. It's hard to tell what the steps are exactly.</p>

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Bio: 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 ... More »
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