Brown & Sharpe Single Spindle screw machine. Model 2G Sq Base, four-slide machine. 1 1/2 cap or 1 3/4 Air Feed.

A screw machine is a metalworking machine tool used in the high-volume manufacture of turned components. Screw machines are fundamentally a type of lathe that is specialized for the automated production of small parts. The name screw machine is somewhat of a misnomer, because screw machines spend much of their time making things that are not screws and that in many cases are not even threaded. However, the archetypal use for which screw machines were named was screw-making.

All screw machines are fully automated, whether mechanically or by CNC , which means that once they are set up and started running, they continue running and producing parts with very little human intervention. This has been true since the 1870s. Mechanical automation came first, beginning in the 1870s; computerized control came later, beginning in the 1950s.

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