In the field of CNC precision machining, CNC Milling and CNC Turning are two of the most common machining processes. Many customers often ask: What exactly is the difference between them, and how should I choose?
CNC Turning
CNC Turning is primarily used for machining rotational parts. The workpiece rotates at high speed while the cutting tool moves along straight or curved paths. It is ideal for producing symmetrical components such as shafts, cylinders, cones, and threads. CNC Turning offers high efficiency and excellent surface finish, making it particularly suitable for mass production of shafts and disc-type parts.
CNC Milling
In CNC Milling, the workpiece is fixed while the cutting tool rotates at high speed and performs multi-axis movements. It can machine flat surfaces, grooves, holes, complex curves, and irregular structures. Five-axis CNC Milling enables one-time machining of highly complex geometries and is widely used for housings, molds, brackets, and precision structural parts.
Key Differences Summary:
Motion Principle: In turning, the workpiece rotates; in milling, the tool rotates.
Suitable Part Shapes: Turning excels at round symmetrical parts, while milling is better for complex non-symmetrical and multi-faced components.
Efficiency Focus: Turning is faster for cylindrical surfaces, whereas milling offers greater flexibility for polyhedral and curved surface machining.
In real projects, the two processes are often combined. For example, CNC Turning is first used to machine the outer diameter, followed by CNC Milling to create keyways or flat surfaces.