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Reaming is the process of making regular and precise holes. Electrification may be done by hand, machine tools, or drills. The holes created by the drill do not have a certain tolerance, nor are they smooth and polished, so it is necessary to perform a new operation that can obtain the necessary specifications. The saw can be called a rotating cutting tool. Because this tool has one or more cutting edges that can be used to make the holes to the actual size. The material of the electrodes is usually made of tool steel or high-speed steel, the edges of the electrodes are plated with different types, then the winning edge is sharpened with a stone machine … ....

This type of welding is a solid-state welding process that is performed as a result of the collision of one of the components at a very high speed due to the use of explosives. The most common use of this process is for coating or cladding carbon steel with a thin layer of corrosion-resistant materials (such as stainless steel, nickel alloy, titanium or zirconium). Due to the nature of this process, the shape of the parts is very important and in general they should be simple. Commonly produced shapes are sheets, tubes and tube sheets… ....

After World War II, the need for devices capable of making sophisticated and precise parts for the aerospace industry was felt before 1949; In 1949, Parsons signed its first contract with the US Air Force to build the first NC numerically controlled device. In 1951 the project was handed over to the Massachusetts Institute of Technology (MIT) …...

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