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Mastering CNC External Turning with Carbide Inserts: A Comprehensive Guide

In the world of CNC machining, external turning with carbide inserts is an essential process for a vast range of industries. When properly executed, it can significantly improve the productivity, efficiency, and quality of finished components. The aim of this blog post is to provide an in-depth understanding of CNC external turning and the use of carbide inserts. We will delve into the benefits of using carbide inserts, key factors to consider when selecting the most suitable insert type, tips for improving tool life and performance, as well as some helpful maintenance practices.

Understanding CNC External Turning

CNC external turning is a machining process that involves removing material from a workpiece's outer surface to create a desired shape. This process is typically required in industries such as automotive, aerospace, and heavy machinery. CNC machines employ a computerized controller to accurately guide cutting tools like carbide inserts, removing material based on a pre-programmed blueprint for a precise and efficient operation.

Advantages of Carbide Inserts

Carbide inserts are widely used as cutting tools in CNC turning operations for a variety of reasons. They possess numerous advantages compared to other cutting tool materials, such as high-speed steel or ceramics. Some of the key benefits of using carbide inserts are:

1. Superior Wear Resistance:Carbide inserts have a high wear resistance, which allows them to maintain sharp cutting edges for prolonged periods. As a result, fewer tool changes are needed, and production can remain uninterrupted for longer durations.

2. High-Speed Cutting:Carbide inserts can withstand high cutting speeds while maintaining excellent surface finish and dimensional accuracy, contributing to reduced cycle times and improved productivity.

3. Versatility:Carbide inserts are available in a wide range of grades, coatings, shapes, and sizes, ensuring optimal performance under various cutting conditions and workpiece materials.

Factors to Consider when selecting Carbide Inserts

When it comes to selecting the most suitable carbide insert for your CNC external turning operations, it is essential to consider several factors, such as:

1. Insert Shape:Carbide inserts come in various shapes, each offering different geometries suited for specific applications. Some common shapes include square, rhombic, triangular, and round. The insert shape determines the number of available cutting edges and the approach angle, which affects chip flow and cutting forces.

2. Insert Grade:The insert grade refers to the composition of the carbide material and its properties. Selecting the right grade is crucial, as it determines the insert's wear resistance, heat resistance, and toughness.

3. Coating:Carbide inserts can be coated with various materials to enhance properties like wear resistance, chemical resistance, and heat resistance. Some common coatings include titanium nitride (TiN), titanium carbonitride (TiCN), and aluminum oxide (Al203).

4. Chipbreaker Geometry:The chipbreaker geometry on the insert influences the chip formation, chip evacuation, and cutting forces. By choosing the appropriate chipbreaker geometry, you can ensure efficient chip control and a smooth cutting process.

Tips for Improving Tool Life and Performance

To maximize the potential of carbide inserts in CNC external turning, it is important to adhere to some best practices for enhanced tool life and performance:

1. Optimal Cutting Parameters:Establishing optimal cutting parameters like spindle speed, feed rate, and depth of cut is vital. Properly adjusted parameters help minimize tool wear, reduce cutting forces, and improve surface finish.

2. Coolant and Lubrication:Using the correct coolant and lubrication is crucial for maintaining temperature stability, reducing friction, and promoting efficient chip evacuation.

3. Regular Tool Inspections:Regularly inspecting the inserts for wear or damage ensures timely replacements and prevents issues stemming from degraded cutting edges, like poor surface finish and compromised dimensional accuracy.

Maintaining Carbide Inserts

In addition to optimizing the CNC external turning process, proper maintenance practices contribute to longer tool life and consistent performance. Some of these practices include:

1. Proper Storage:Store carbide inserts in their original packaging at a temperature-controlled environment to prevent exposure to contaminants or moisture that could degrade the inserts' quality.

2. Cleaning:Regularly clean the inserts using a soft brush or compressed air to ensure efficient removal of chips and debris.

With this comprehensive guide, we hope to provide valuable insights into the world of CNC external turning with carbide inserts. By understanding the factors to consider when selecting carbide inserts, refining the CNC process, and maintaining your tools properly, you can enhance the productivity, efficiency, and quality of your external turning operations, ensuring success in your applications.

cnc external turning tool carbide insert

What is CNC Turning

CNC turning is a process that involves using computer numerical control (CNC) machines to shape and finish various materials, such as metals and plastics, into desired shapes and sizes.
This process is typically used in the manufacturing industry to produce precision parts and components for a wide range of applications, including automotive, automation, aerospace, medical, machinery, and industrial.

CNC Turning service

Asianstar Professional CNC Turning Service

Asianstar CNC turning Service offers precision machining for a wide range of materials, including metals, plastics, and composites. With high level facilities and skillful operators, we can produce high-quality parts with tight tolerances and intricate designs.

Our CNC turning capabilities allow us to produce parts with diameters ranging from 0.5 mm to 480mm and lengths up to 450mm. We offer both single and multi-axis turning, as well as live tooling options for added complexity and accuracy.

We use proven processes and quality control measures to ensure that every part we produce meets our clients' specifications and expectations.

Whether you need a single prototype or high-volume production runs, our CNC turning service can provide the precision and reliability you need to get your project completed on time and on budget.

CNC Turning service

Components Sizes of Asianstar CNC Turning Service

Unit (mm) Min Max
Out Diameter 0.5 480
Inner Diameter (Hole) 0.3 465
Length 1.0 450
Groove Diameter 0.4 above
Thread M1.2 above

Components Tolerance of Asianstar CNC Turning Service

Unit (mm) Tolerance according to sizes
Height Tolerance Diameter Size 0.5 to 3 3 to 6 6 to 30 30 to 120 120 to300 300 to480
Tolerance ±0.003 ±0.010 ±0.020 ±0.030 ±0.035 ±0.040
Length Tolerance Length Size 0.5 to 3 3 to 6 6 to 10 10 to 20 20 to 30 30 above
Tolerance ±0.010 ±0.020 ±0.250 ±0.250 ±0.030 ±0.035

Components shape and position tolerance of Asianstar CNC Turning Service

Tolerance Class followed Tolerance (mm)
Straightness and Flatness Verticality Symmetry
10 10 to 30 30 to 100 100 to 300 300 to 1000 1000 to 3000 to 100 100 to 300 300 to 1000 1000 to 3000 to 100 100 to 300 300 to 1000 1000 to 3000
H ±0.015 ±0.02 ±0.03 ±0.05 ±0.10 ±0.15 ±0.02 ±0.025 ±0.03 ±0.035 ±0.02 ±0.03 ±0.04 ±0.05

Capability of Asianstar CNC Turning Service

Type of Turning Machine Diameter Size (mm) Length Size (mm) Productivity (PCS/Month)
Auto Turning Machine Simple Turning Machine Multi Turning Machine Pin Turning Machine Min 0.5 Max 480 Min 1.0 Max 450 200’000/Item


Multiple Machining Processes

Multiple Machining Processes

Asianstar has various machining processes to support different types of components from client, we can choose the best suitable manufacturing solution to carry result in perfect performance and cheap cost

Flexible Custom Service

Flexible Custom Service

With skillful machining technologies, Asianstar is flexible to support clients on different materials and different structures of the components, we also flexible on the components quantities and even assembly

Create Designing for Clients

Create Designing for Clients

Not only producing according to clients drawings, Asianstar also propose the better designing to clients, supporting clients to buildup improved designing or even new generation components

Standard Procedures

Standard Procedures

Asianstar production, as experienced by many years, is strictly following internal Standard Operating Procedures, to make sure the production schedule is smooth and plans are well carried out well without accidents

Standard Procedures

Standard Procedures

Asianstar strictly controlling product quality by system. We start QC controlling from production plan once setting up, to production process by monitoring QC checking and until the final Inspection before packing

Fast Lead-Time Delivery

Fast Lead-Time Delivery

Asianstar strictly control the production processes, teams keep the plan moving ahead according to the procedures, we have internal time management schedule which mostly bring earlier lead-time of delivery

Asianstar: Professional CNC Machining Supplier

From year of 2005, Asianstar Company establish the CNC Machining Factory in Guangdong Province, China.
We mostly provide CNC Turning, Milling, Drilling, Grinding, and Multi Machining processes service on various materials.
With the Belief of becoming a key supplier in the supply-chain of Precision Components, we strictly control our product quality, keep high precision on our components production, buildup the whole-process QC System and submit the satisfaction for every order.
By long term development, we have buildup partnership with world-wide clients, supporting our partners in Designing, Optimizing, Producing and Testing on each type of components.


CNC Turning Service

CNC Turning Service

Our CNC Turning Service provides different sizes of roll shape work-pieces, the diameter range is from 0.5mm to 480mm, reaching tolerance +/-0.003mm.

CNC Milling Service

CNC Milling Service

Our milling machines and CNC centers are able to produce complicated structure part, five-axis devices produce multi-sides at one-time jag which bring high precision result

Sheet Metal Fabrication

Sheet Metal Fabrication

Our Sheet Metal Fabrication provides slicing, punching, bending, welding, painting and assembling for set products, unique tooling for each project to raise production efficiency

Aluminum Extrusion

Aluminum Extrusion

Our Aluminum Extrusion brings clients various shapes of aluminum parts, high efficiency for mass quantity, our precision extrusion mold control tolerance within 0.01mm

Forging Service

Forging Service

For some steel serious products, we apply Forging Service to make out their outer shape and them use CNC devices to start drilling, forming, rolling, cutting, etc.

Finishing Service

Finishing Service

Our Surface Finishing Service uses chemical or electro post-treatments after machining tasks are finished, normally includes Oxide, Anodizing, Passivation, E-Plating, Painting,etc.


  • Q1.Do you support ODM/OEM?

    Yes, we support ODM/OEM, we provide custom-made service for clients or even support clients on designing or improving

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