Gears have a long history and have been used for many purposes throughout civilization. By starting with an initial source of motion and force, then combining that with intermediate gearing, engineers and designers throughout time have created functions that result in output of desired motion and force for purposes of performing many different functions. Many forms of gearboxes exist that incorporate different features, depending on the manufacturer. The intent of this article is to touch on a few and provide a generalized overview of gearbox function and features. (LEFT: One of the earliest uses for gears in an industrial situation was for mills. This is the Glade Creek Grist Mill in Babcock State Park, WV.)
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