Gears can be connected together to complete three basic tasks. First, gears can be used to increase speed. For example, if a gear with more teeth passes power to a gear with fewer teeth, the second gear will turn more quickly.Gears come in a wide variety of sizes and shapes, because they can be customized to perform many different tasks in all sorts of machines. Some of the most popular types of gears you may hear about include helical gears, bevel gears, spur gears, worm gears, rack and pinion gears, and sun and planet gears.So who came up with these incredible devices? Some historians believe gears date back to at least the 27th century B.C. when they were used in a chariot in China. The ancient Greeks, including Aristotle, also described gear-like devices. Greek mathematician Hero of Alexandria was the first to write specificly about gears in 50 A.D.
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January 2018
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