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Originally Posted by kramarczyk
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This occurs over two stages though, so it might not be what Mat is looking for. Keep in mind Mat that 14 teeth is probably the smallest CIM spur gear you'll find, which means you'll need an 84 tooth gear to mesh with it in order to get the ratio you want in one stage. A spur gear that size will have a radius of somewhere around 4.5 inches, which might be a problem for you depending on what wheel diameter you plan on using. If you are set on having a single reduction,
Martin Sprocket's pdf catalog list 20dp 14.5pa spur gears with sizes all the way up to 132 teeth. They even happen to carry an 84 tooth gear, what are the chances?
(By the way, the 84 tooth gear they carry has a 1/2 inch stock bore, so all you'll need to do is broach a keyway into it. It also weighs 2 pounds, so be careful
)
Mike C.