Manufacture of products made of steel and other materials by mechanical action using a drill, cutter and other cutting tools. The process itself is carried out on metal-cutting machines, in the prescribed manner according to the technological process.
When mechanical action is applied to the surface, a new surface is formed by deformation and further separation of the layers from the main part of the material. It is accompanied by the appearance of shavings.
The part of the material that is removed by metal-cutting machines is called an allowance. It is redundant. After the allowance is removed from the part, it takes on a certain shape.
A small allowance should be made during production, as this will reduce the labor intensity of the process and the cost of the part, as well as save material.