Below is a list of CNC Manufacturing manufacturers from Springfield, Illinois. CNC manufacturing is a production process that utilizes specialized computer software to direct complex automated machine components in the design and production of precision parts and components. Computer numerically controlled machines allow for the fast, efficient and accurate production of identical parts with little human intervention. While the workforce may be significantly reduced, it is important that all operations be supervised by trained machinists who must monitor, calibrate and maintain the machines on a regular basis to ensure continued performance.