A little primer for those not in the know.

What are CNC machines?

The CNC machines are widely used machines and are used almost in all branches of “applied mechanics”. Until the ’80s they were only used for industrial and precision machining. Today, there are “flexible” machine tools that make it possible to produce special products on demand via numerical control based on an external computer. These machines can meet the widest range of small, medium and large series of requirements and meet the highest quality standards with unique finite products in their category. Nowadays, the CNC Machining has a lot more applications and advantages.

see the article here