Here, automata guru Dug North rounds up four expedient methods for improvising a worm drive given an on-hand spur gear. Digging through our archives also reveals this interesting method for coming at the problem from the other direction, i.e. improvising a spur gear for an on-hand worm! [Thanks, Dug!]

Sean Michael Ragan

Sean Michael Ragan

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 – Magazin für Computertechnik, and The Wall Street Journal.