CNC machining is a multi-stage complex process where precision is the most important factor. Precision means that there is no room for any margin of error. Computer-controlled metalworking also means greater precision in execution, which translates directly into the possibility of obtaining metal parts of better quality. What is important, this quality is also found in high volume and mass production, guaranteeing excellent repeatability and accuracy in the reproduction of each component obtained. What allows us to adhere to such rigorous standards when machining?