CNC stands for Computerized Numerical Control. CNC machining controls a range of complex machinery, such as grinders, lathes, and turning mills, all of which are used to cut, shape, and create different parts and prototypes. Summary. So as we've discussed, the CNC machining process can be challenging to master but it is certainly not out of your reach. You should expect it to take over 3 years of hard work to master but it can take just a few hours of easy tutorials to create basic parts. One reason for using CNC machining for production is efficiency. Since computers are used to control machines, it means that all major operations of production can be automated to increase speed and quality of manufacturing. By using CNC machines, identical parts can made with the highest accuracy levels.