Milling vs Turning in CNC Machining: What Is the Difference?

Milling and turning are the two fundamental CNC machining processes, and understanding the difference between them helps you choose the right approach for your part design. While both processes remove material to create a finished part, they work in fundamentally different ways and are suited to different types of geometries.

In CNC milling, the workpiece is held stationary (or on a rotating table in 5-axis configurations) while a rotating cutting tool moves across and into the material. The cutting tool spins at high speed and moves along multiple axes to create features like pockets, slots, holes, contours, and flat surfaces. Milling is ideal for parts with complex shapes, multiple features on different faces, and non-round geometries. At Mohan Machining, our milling department includes the Haas VF-9/50 with 84x40x30-inch travel for large parts, and Haas VM-3 and Okuma MV-55 VB 5-axis mills for complex geometries.

In CNC turning, the workpiece rotates while a stationary cutting tool moves into the material. This process is specifically designed for creating cylindrical or round parts such as shafts, pins, bushings, spacers, and threaded components. The spinning workpiece allows the cutting tool to produce smooth, concentric surfaces with excellent roundness and surface finish. Our turning department features an Okuma LH-40 with 28x100-inch capacity, a Doosan S310N, and a Daewoo Lynx 200 for various part sizes.

Many parts require both milling and turning operations. For example, a shaft might be turned to create its round profile, then milled to add flats, keyways, or cross-holes. At Mohan Machining, we offer both CNC milling and CNC turning under one roof in Sacramento, which means your parts do not need to travel between shops. This saves time, reduces costs, and ensures consistent quality. Both processes achieve tolerances as tight as plus or minus 0.0001 inches.

Whether your part needs milling, turning, or both, Mohan Machining has the equipment and expertise to deliver. Contact us for a free quote.