If you are curious about the technical details of designing and laying out gears and gear trains, you can download a complete, free, public domain copy of the 1922 edition of the American Machinist Gear Book from Google Books right now.
I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I am a long-time contributor to MAKE magazine and makezine.com. My work has also appeared in ReadyMade, c't โ Magazin fรผr Computertechnik, and The Wall Street Journal.
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