CNC turning services CNC turning is considered the best process to make cylindrical parts, to a high level of accuracy and precision. The turning process reduces the diameter of the original workpiece to a specified dimension, the rotation is performed using a lathe and produces a smooth part finish. There are four different types of turning; straight turning, taper turning, profiling and external grooving. CNC turning can be performed on the outside of a workpiece and on the inside (known as boring) to produce tubular components. What does CNC stand for? The abbreviation ‘CNC’ stands for computer numerical control. It is the name given to the process of converting a design made by computer-aided design software (CAD) into numbers, using a computer. These numbers control the movement of the specific tool being used for the CNC process selected. Longpan Manufacturing uses the latest CNC machining technology to produce high-quality parts at unparalleled process speeds when punching, turning, folding and machining.