CNC machining is a highly utilised subtractive manufacturing technology. Computer numerical control systems offer less need for manpower and higher levels of automation.One of these automated fabrication methods is CNC milling. It is a process where rotary cutters remove material, which makes it the opposite of CNC turning.The milling centres do not just perform the cutting automatically, but also the changing of tools. During the average process of creating a finished product from a block of metal, for example, various tools are used.