What is a CNC machine?

A CNC machine, or Computer Numerical Control machine, is defined as a computer-controlled device that automates machining tools. This technology allows for precise control of tools such as lathes, mills, grinders, and routers through programmed commands. By using computer-aided design (CAD) and computer-aided manufacturing (CAM) software, CNC machines can execute complex designs with high accuracy and repeatability.

This capability transforms the machining process from a manual, labor-intensive task into one that is highly efficient and consistent. The use of digital instructions means that CNC machines can produce intricate parts with tight tolerances, which is essential in industries like aerospace, automotive, and manufacturing.

The other options highlight either traditional methods of machining or alternative technologies that do not embody the essence of CNC operation. The focus on computer control and automation in option B clearly distinguishes CNC machines as advanced tools in modern machining processes.