CNC machining is the basic technique of manufacturing elements and tools made of steel and plastics by machining. It is characterized by remarkable precision of elements, obtained thanks to the use of computer programs. With various types of tools such as milling machines, lathes, cutters or grinders, CNC machining is performed, which consists in cutting small fragments from the main part of the shaped element. What is important is that cutting can not only achieve a specific shape, but also smooth the edges – which is an important technical parameter that affects the aesthetics of the product. Before starting the mechanical stage of works, a specialized program analyses the type of material and its roughness, taking into account the customer’s expectations.