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  1. Copilot Answer
    The Amazing World of Gears
    The Amazing World of Gears
    Gears are everywhere. They are essential for machines, vehicles, clocks, and even toys. But how do they work, and what makes them so fascinating?
    History

    The earliest surviving gears date from the 4th century BC in China (Zhan Guo times – Late East Zhou dynasty), which have been preserved at the Luoyang Museum of Henan Province, China.
    In Europe, … See more

    Etymology

    The word gear is probably from Old Norse gørvi (plural gørvar) 'apparel, gear,' related to gøra, gørva 'to make, construct, build; set in order, prepare,' a common verb in Old Norse, "used in a wide range of situations fr… See more

    Materials

    The gears of the Antikythera mechanism are made of bronze, and the earliest surviving Chinese gears are made of iron, These metals, as well as tin, have been generally used for clocks and similar mechanism… See more

    Manufacture

    The most common techniques for gear manufacturing are dies, sand, and investment casting; injection molding; powder metallurgy; blanking; and gear cutting.
    As of 2014, an estimated 80% of all gearing produced w… See more

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