Math Gear(s)

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NEW VERSION!!! POSTED 12-29-13 At first glance, updates are barely noticeable but every piece has been thoroughly revised. Changes simplify assembly with better fit and smoother operation. This Math manipulative is designed to appear playful from the start. It lies flat on a desk top, making it suitable for use with overhead projection systems as well. Behind the mechanical fun, several simple ratio exercises await discovery. The eight-tooth "Idler" gear is included to add reverse rotation without affecting ratios. Each interchangeable gear features built-in graphics indicating the number of teeth and rotation position. Gear ratio formulas can be found here: http://en.wikipedia.org/wiki/Gear_ratio. Rubber bands provide tension, ensuring wheels remain engaged regardless of combination. FYI, the "T" on gears denotes "teeth". Instructions This design is optimized for printing on MakerBot Replicator 2 machines but should yield good results on earlier models as well. All parts fit within a 105 mm x 105 mm build area, requiring no support.