Many historians of technology consider that true machine tools were born when the toolpath first became guided by the machine itself in some way, at least to some extent, so that direct, freehand human guidance of the toolpath (with hands, feet, or mouth) was no longer the only guidance used in the cutting or forming process. ( February 2021) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources in this section. This section needs additional citations for verification. Nomenclature and key concepts, interrelated With their inherent precision, machine tools enabled the economical production of interchangeable parts. Today machine tools are typically powered other than by the human muscle (e.g., electrically, hydraulically, or via line shaft), used to make manufactured parts (components) in various ways that include cutting or certain other kinds of deformation. While all machine tools are 'machines that help people to make things', not all factory machines are machine tools. The precise definition of the term machine tool varies among users, as discussed below. It is a power-driven metal cutting machine which assists in managing the needed relative motion between cutting tool and the job that changes the size and shape of the job material. Thus, the relative movement between the workpiece and the cutting tool (which is called the toolpath) is controlled or constrained by the machine to at least some extent, rather than being entirely 'offhand' or ' freehand'. All machine tools have some means of constraining the workpiece and provide a guided movement of the parts of the machine. Machine tools employ some sort of tool that does the cutting or shaping. A metal lathe is an example of a machine toolĪ machine tool is a machine for handling or machining metal or other rigid materials, usually by cutting, boring, grinding, shearing, or other forms of deformations.

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