The sight of these non-traditional gear configurations might seem unreal to the untrained eye - but in fact these are used in a variety of industrially applications. Non-circular gears [via Hacked Gadgets]
Non-circular gears in motion
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the one they give the most time and show the CAD version of reminds me of a rotary engine... only more complex. these gears have some really nice aesthetic qualities in their movement...
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If this is the sort of thing you like, you'll probably like KMODDL - Kinematic Models for Design Digital Library.
http://kmoddl.library.cornell.edu/
The day I discovered the site I managed to loose hours in there.
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See also:
http://www.dugnorth.com/blog/2008/08/non-circular-gears-uncommon-planetary.html
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