machine tool


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machine tool,

power-operated tool used for finishing or shaping metal parts, especially parts of other machines. An establishment that is equipped with such tools and specializes in such work is known as a machine shop. Machine tools operate by removing material from the workpiece, much as a sculptor works. Basic machining operations are: (1) turning, the shaping of a piece having a cylindrical or conical external contour; (2) facing, the shaping of a flat circular surface; (3) milling, the shaping of a flat or contoured surface; (4) drilling, the formation of a cylindrical hole in a workpiece; (5) boring, the finishing of an existing cylindrical hole, as one formed by drilling; (6) broaching, the production of a desired contour in a surface; (7) threading, the cutting of an external screw thread; and (8) tapping, the cutting of an internal screw thread. In addition there are operations such as sawing, grinding, gear cutting, polishing, buffing, and honing. The tools themselves vary in size from hand-held devices that can be used for drilling and grinding to large stationary tools that perform a number of operations. Many machine tools have a name that indicates their principal function, e.g., drill press, broach machine, milling machine, and jig borer. The lathelathe
, machine tool for holding and turning metal, wood, plastic, or other material against a cutting tool to form a cylindrical product or part. It also drills, bores, polishes, grinds, makes threads, and performs other operations.
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 can perform turning, facing, threading, drilling, and other operations. In order to withstand the great heat that this work generates, the materials used in machine tools must be extremely hard and durable. Thus, their working surfaces are made of such substances as high-speed steels, sintered carbides, and diamonds. To help dissipate the heat, the area of contact between the working surface and the workpiece is usually lubricated with a fluid that may also improve the finish of the workpiece's surface. Modern machine tools are often numerically or computer controlled; where a human operator can be distracted, and is limited by the speed of human reflexes, a numerically controlled machine is more reliable and accurate. See boring millboring mill,
machine tool used to increase the size of a hole previously made in a workpiece, usually with the purpose of obtaining a required degree of finish and accuracy in the final hole.
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machine tool

[mə′shēn ‚tül]
(mechanical engineering)
A stationary power-driven machine for the shaping, cutting, turning, boring, drilling, grinding, or polishing of solid parts, especially metals.

machine tool

a power-driven machine, such as a lathe, miller, or grinder, that is used for cutting, shaping, and finishing metals or other materials
References in periodicals archive ?
The Machine Tool market on the source of area with respect to trades in terms of intake, profits, market stake and development percentage in these areas, for the duration of the prediction could span North America [U.S., Canada and Mexico], South America [Brazil, Columbia, Argentina],Europe [France, Spain, Germany, U.K., Italy and Russia], Asia Pacific [India, Japan, China, South Korea and South East Asia], Middle East & Africa [UAE, Saudi Arabia, Nigeria, South Africa and Egypt].
* Simplified 3D Layout of Machine Tool with all accessories and equipment
With over 6000 employees, the machine tool division of FFG, including the MAG Group, generates an annual turnover of more than 2.3bn.
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The new TAC will also showcase how Siemens solutions and services for machine tools, drives and automation work together to optimise operational costs, maximise ROI, enable higher productivity and precision in key industries like automotive, automotive supply, aerospace, power and medical.
companies that use machine tools have about 2 million machine tools and employ 750,000 to 1 million workers in directly-related occupations, such as toolmakers, machinists, operators, and programmers.
Two, NC Machine Tool Simulation lets NC programmers simulate selected machine tool paths, determine interferences, modify tool paths or machining operations, and generate ISO code.
In addition, both South Korea and Taiwan, which have become major powers in the world machine tool business just over the past half decade or so, will continue to raise their profile as both producers and consumers of machine tool products.
China is the world's largest machine tool market, accounting for 19 percent of global sales totaling 3.8 trillion yen in 2003, according to Mitsubishi Heavy Industries.
The machine tool industry has some strong arguments for relief.
is considering closing its large-scale machine tool manufacturing plant in the western Japan city Hiroshima as early as 2003 due to slack demand, company officials said Wednesday.

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