The main purpose of machining is to obtain the necessary geometric shapes, dimensional accuracy and surface finish according to the drawing.

Extra layers of metal (allowances) are removed from the blanks by cutting tool on machines. Castings, forgings and blanks from rolled ferrous and nonferrous metals are used as blanks.
Cutting of metals is one of the most common ways of machining parts and appliances. Machining of parts on machine tools is provided as a result of the workpiece and the cutting tool movement, where the tool removes chips from the workpiece surface.

Metal cutting machines are divided into groups depending on the processing methods, types and sizes.

Depending on the nature of the work and the type of cutting tool the following methods of metal cutting are distinguished: turning, milling, drilling, reaming, slotting, broaching, etc.