Many years ago, machining, metalworking and fabrication were performed by NC or numerical controlled. These Numerical Controlled machines were the brain child of the late John T. Parsons, whom was commissioned to work closely with the Massachusetts Institute of Technology, the end product was commissioned by U.S.A. Air Force.  With Aerospace parts and mechanisms being of intricate design and complex shapes. They were looking to find the cheapest Cost Per Unit method to manufacturing these parts. NC based machines became the industry standard of machining highly complex parts.

Computer Aided Design and Computer Aided Machining was developed in 1972, this made the room for prominent developments in CNC machining. By 1989, CNC machines became the industry standard. They were utilizing the ability to 3-D model and translate into production based manufacturing.

Originally, old numerical controlled machines had punch cards to operate. These codes were punched in a particular order to help logic based order machining. These codes were called G-codes. The codes were intended to give the machine positioning information and instructions. G –codes in Modern day CNC machines, with logical commands have been created to help build new programming languages by using existing coding as a platform. Some of the new coding is called parametric programming, this allows operators to make changes during machining and project loads, giving the ability to free create at the machine interface without having to stop and reflash to the new program.

The advantage of CNC machining is productivity, error reduction, accuracy, cost reduction, and safety. Operators and Inspection personnel involvement decreased when using a CNC machine. This greatly improves the Profit Margins or reduction of costs associated to the manufacturing.  With the involvement of CNC and the ability to run without an operator, some companies are utilizing lights-out production meaning they run the machines when no one is the facility to monitor production.  If there is a problem with the machine, the software automatically stops the machine and calls the operator or stops production until someone approves continued production.