CNC milling differs from classical milling because it is performed with numerical machine control, also called "CNC milling cutter", or simply "CNC" ("computer numerical control").
CNC milling is a cold mechanical process for the removal of swarf, carried out by a tool rotating around its own axis of rotation on a piece in forward motion. For the production of the required part it is necessary that the material used has dimensions certainly greater than the finished product. The excess material that is removed during milling is known as allowance.
The work cycle of the 3-AXIS CNC MILL and 5-AXIS CNC MILL normally involve a first rough step, in which the stock removal is done as quickly, and therefore as economically, as possible. This leaves a sufficient amount for the next stage of finishing in which the last excess material is removed. Finishing, which consists of a very limited removal of metal, allows completion of the project respecting the tolerances of the dimensions and the degree of surface roughness.
The CNC milling is performed by the most modern CNC milling machines.They are equipped with automatic systems for the replacement of tools, able to follow an entirely automated production process: this allows raw material to be turned into finished pieces without any human intervention, making processing faster and cheaper. This is particularly useful for example in the milling of moulds, which are very complex parts that require many hours of machining and a multiplicity of tools.
Once the CNC program has been put together in our technical department, the machine is set and from then on can work independently, without any operator intervention.
the current precision limits of CNC milling centers are in the order of microns (0.001 mm), even though to achieve such precision particular working conditions are necessary such as an air conditioned environment, a very solid base, thermal sensors on the axles, optical guiding, ...