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How did machine tools help make mass production and interchangeable parts possible?

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A diagram displays six types of simple machines with labeled illustrations: inclined plane, wedge, screw, lever, wheel and axle, and pulley, each shown with real-world examples like ramps, axes, screws, seesaws, door handles, and pulleys lifting objects. — simple machine Six simple machines for transforming energy into work.

Machine tools were the essential technological foundation for mass production and interchangeable parts. Before their development, goods were crafted by hand, leading to variations that prevented parts from being swapped between products.1

Machine tools enabled the fabrication of machinery capable of cutting and shaping hard metals to precise, consistent tolerances. By using precision equipment—along with jigs and fixtures to guide tools and hold workpieces—manufacturers could produce large quantities of identical components at a low cost with a smaller workforce.123

Key innovations in the 19th century, such as Henry Maudslay’s screw-cutting lathe, the milling machine, and various grinding machines, allowed for the creation of dimensionally accurate parts. This capability gave rise to the American System of manufacture, which revolutionized industries ranging from firearms and clocks to sewing machines, ultimately forming the basis for the modern industrialized society.12