Main Machining Process of CNC Turning Rotary Part

2026-07-03 16:08:39

CNC machining is one of the most classic processes in CNC machining, and it is also the preferred machining method for all axisymmetric rotating parts. It has an irreplaceable cost-effectiveness advantage in the production of shaft and sleeve parts.

working principle

The workpiece is clamped on the lathe spindle and rotates at high speed with the spindle. The turning tool performs CNC feed motion along the axial and radial directions, removes excess material through cutting, and processes rotational features such as outer circles, inner holes, end faces, threads, conical surfaces, arcs, grooves, etc. The core features are workpiece rotation, tool movement, and all machined structures are symmetrical around the spindle axis.

Process Characteristics

High processing efficiency: The rotating body can complete multiple processes in one clamping, and the unit cost of large quantities of shaft sleeve parts is extremely low;

Easy to control dimensional accuracy: High precision CNC lathes can stably achieve IT6~IT7 level accuracy, with surface smoothness better than ordinary milling;

Mature and stable process: simple programming, low debugging cost, fast changeover speed, suitable for the production of multiple varieties and small batches of rotary parts;

Strong scalability: When paired with a power turret, it can be upgraded to a turning milling composite, which can process features such as flat surfaces, keyways, and transverse holes on the rotating body.

Typical scope of application

Core compatible parts: all axisymmetric rotating parts such as shafts, sleeves, flanges, bolts and nuts, pin shafts, bushings, pulleys, valve core sleeves, etc;

Accuracy level: ordinary CNC lathe IT7~IT9, precision CNC lathe can reach IT6~IT7, meeting the majority of mechanical coordination requirements;

Suitable materials: almost all machinable materials such as carbon steel, stainless steel, copper aluminum, engineering plastics, etc.

Nicheng reminder: For parts with pure rotary structure, CNC machining is the most cost-effective process, and there is no need to blindly choose machining center solutions. For rotating parts with a small number of flat surfaces and hole positions, it is preferred to choose the combination of turning and milling, which can complete all processing in one clamping, with higher accuracy and lower cost than the "turning+milling" split processing.

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