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Wrap Your Head Around These Gears
Cool article, though. Thanks!
this is a direction changing gear.
let's take a look.
the inner gear would first be engaged by the inner teeth, then the outer teeth, then the inner teeth again.
so hence this causes the inner gear to change its direction of rotation.
Here are paradoxical gears that move like regular ones:
http://www.youtube.com/watch?v=7h_Q3GmwShQ&feature
It's all probably really damn weird if you'd try and calculate their properties like ordinary toothed gears, but intuitively, they seem just fine. But then, maybe I'm completely wrong and these gears are a wisp of black magic.