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#38 - guitarguise
Reply +15
(01/14/2013) [-]
I want to know how it turns back the other way
#45 to #38 - theblindpilot
Reply +3
(01/14/2013) [-]
look at the lower round gear. the small rod attached to it moves a larger rod which turns the fan. The farthest that small rod can move is the diameter of the gear and after that comes back in the other direction.

tldr; you're moving along a circle
#43 to #38 - pjoach
Reply +2
(01/14/2013) [-]
If you watch the main cog as it approaches the end of the gif the fan slows down in it's directional change. Imagine a line from the centre of the fan back to the main cog as it passes this line it start's moving the fan the other way.