CNC Turning: Process, Characteristics, and Applications
2025/9/19
What Is CNC Turning？
CNC turning is a type of subtractive machining where metal or plastic materials are cut using machine tools. It originates from the traditional turning process, but since most turning today is performed on computer-controlled (CNC) lathes, the term “CNC turning” has become the standard. In this process, the workpiece rotates at high speed while a fixed cutting tool shapes it. Operations such as cutting, drilling, boring, and threading can all be performed through CNC turning. Give the rotating nature, it is mainly used for machining cylindrical shapes.
Because CNC turning does not require molds or large-scale setup, it is highly suitable for small-lot production, custom parts, and rapid prototyping. Common applications include robotics, automation equipment, and functional prototypes.
NC Lathes
Numerical control lathes use a control unit, operation panel, and servomotor to position cutting tools with extreme precision, up to 0.001mm increments. They enable automated machining via programming and achieve highly accurate results.
Compound Lathes
Compound lathes combine turning and milling functions. It increases work efficiency and makes it possible to drill holes off-center, machine hexagonal or square profiles from a round bar, and perform other complex multi-axis machining processes.
Characteristics of CNC Turning
There are three main characteristics of CNC turning.
Machining accuracy
A CNC turning machine equipped with a numerically controlled NC device can perform high-precision processing in 0.001 mm increments. This allows not only dimensional accuracy but also surface roughness to be adjusted.
Material Flexibility
There are a wide variety of materials that can be cut with a lathe, from easy-to-cut materials to difficult-to-cut materials. Therefore, you can select the material that suits your application.
Low Minimum Order
Since there is no need to prepare molds, processing can begin immediately. The initial cost is low, making it suitable for prototyping and custom small-lot production. However, because the processing cost is higher, CNC turning is not suitable for mass production that involves casting.
Types of CNC turning
CNC turning can be broadly divided into five types of machining:
External diameter machining
End face machining
Internal diameter machining
Thread cutting
Forming.
By combining these operations, CNC turning can produce highly complex shapes.
Major Category | Subcategory | Processing details |
External diameter processing | Outer round shaving | Cut the outer periphery to reduce the outer diameter. You can also process square and hexagonal shapes using the side of the end mill. |
Step shaving | External round cutting is performed multiple times to create step-like step. | |
Taper shaving | Cut the outer circumference diagonally to create a slope on the workpiece and make it into a conical shape. | |
Curved surface cutting | Cut the outer periphery into a curved shape. Creates curved and spherical shapes. | |
Grooving | Partially scrape the outer periphery to create a groove. | |
Cut-off | Groove to the center of the workpiece and cut. | |
Knurling cut | Adds a mesh pattern to the outer circumference of the workpiece. | |
End face processing | End face shaving | Sharpen the end face of the workpiece. |
Front shaving | Creates steps and grooves on the end surface of the workpiece. | |
Chamfer | Remove any burrs formed on the corners of the workpiece. | |
Internal diameter machining | Drilling | Drill a hole in the center of the workpiece. Holes can be drilled on the end and sides. |
Boring | Widen the hole by carving it out. | |
Thread cutting | Male thread cutting | Cut out a male thread on the outer periphery of the workpiece |
Female thread cutting | Cut a female thread inside the workpiece |
CNC Turning Applications & Examples
S45C φ190×150L Boring head
C3604 φ16×28.4L Piston valve
SUS304 φ20×20 Lifter
SUS630 φ4.85×26.8 Screw pin
A2017 φ25×100 Bottle
SUS304 φ20×120 shaft
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Yumoto Electric delivers high-quality components fast, worldwide. We provide precision machining for a wide range of metals and engineering plastics. We have experience with over 200 materials including metals such as aluminum alloys, stainless steel, molybdenum, and titanium, and engineering plastics including PEEK, PPS, MC Nylon, and POM.
If you’re unsure about material selection or machining methods, we offer complimentary consultations to help optimize your design and production. For any questions, please feel free to contact us.
