The most important and primary benefit provided by all CNC machine tools is that they enable automation. Using CNC machines minimizes or completely eliminates operator intervention during workpiece manufacturing. Most CNC machine tools can operate without external intervention during part machining, which provides the CNC machine owner with benefits such as reduced operator error, minimizing errors caused by human error, and allowing for precise and accurate determination of machining time. The second fundamental benefit of CNC technology is the precise and consistently accurate production of workpieces. Today's CNC machine tools possess incredibly high repeatability and positioning accuracy. This allows for the production of two, ten, or even a thousand workpieces with the same precision and dimensional accuracy after program control.