Alan Federman built our Da Vinci Reciprocating Gear project in MAKE Volume 24 (video above). He has a number of other cool working Da Vinci models, built in wood, on his YouTube channel. You can learn a lot about the basic mechanics of gears, cranks, screws, and other simple machines by looking at these devices in action. Below are his screw cutting machine, followed by his file forging machine (it hammer-forges grooves in metal to create a file).
Dr1Bot (Alan Federman’s) YouTube Channel
More:
Check out our entire Mechanics Archive
Check out MAKE Volume 24:

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