Numerical control (NC) (also computer numerical control (CNC)) is the automated control of machining tools (drills, boring tools, lathes) by means of a computer.  The design is first developed in by the Engineer in a CAD software. This CAD design is then transformed by the CAM software and outputted to the computer by a post process application. Motion is controlled along multiple axes, normally at least two (X and Y), The position is controled by a series of motors, servos and step-down gears to insure high accuracy machined parts.
Types of CNC Machines
There are many types of CNC Machines including laser cutting, welding, friction stir welding, ultrasonic welding, flame and plasma cutting, bending, spinning, hole-punching, pinning, gluing, fabric cutting, sewing, tape and fiber placement, routing, picking and placing, and sawing. Plasma cutting is a process that cuts through electrically conductive materials by means of an accelerated jet of hot plasma. 
Our CNC Machines
Here at Millwright Sites LLC., we have a stationary CNC table that is capable of sheets of metal and beams as large as 20’x8′ and as thick as 2″. We also have portable tables and track torches for use in the field on projects.
More images for CNC cutting and Steel Fabrication view Gallery 6.
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