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Mastering CNC Turning for Linear Shafts: A Comprehensive Guide

In the world of manufacturing, precision is key to creating high-quality parts and components. One of the most critical components in various applications is the linear shaft. Machining these with optimal precision calls for the best CNC turning practices. In this blog, we'll walk you through the intricacies of CNC turning for linear shafts, covering everything from choosing the right materials to understanding tolerances and best practices.

Understanding Linear Shafts

Linear shafts, also known as linear motion guides, are cylindrical bars designed to facilitate smooth and precise motion in a straight line. They are used in applications like 3D printers, CNC machines, industrial robots, and other machinery requiring linear motion control.

Choosing the Right Material

When it comes to linear shafts, selecting the appropriate material is crucial for optimal performance and longevity. Some of the most common materials used for manufacturing linear shafts include:

1. Carbon Steel:A popular choice thanks to its great balance of strength, wear resistance, and affordability. It's also an excellent option for applications where corrosion resistance isn't a significant concern.

2. Stainless Steel:Known for its excellent corrosion resistance and durability, stainless steel is widely used in applications where exposure to moisture, chemicals, or other corrosive elements is a concern.

3. Aluminum:Lightweight and corrosion-resistant, aluminum is a popular option for applications where weight and ease of movement are important factors.

4. Brass:With excellent machinability and a low coefficient of friction, brass is a fantastic choice for applications requiring smooth motion without excessive wear.

CNC Turning Essentials

CNC (Computer Numerical Control) turning refers to the automated process of machining cylindrical parts using a lathe. The cutting tool removes material from the workpiece while it rotates to create the desired shape and dimensions. Some essential aspects of CNC turning for linear shafts include:

Tolerances:Ensuring the dimensions of the finished shaft fall within acceptable tolerances is crucial for achieving optimal performance. Typical tolerances for linear shafts range from ㊣0.005 inches to ㊣0.0005 inches. The tighter the tolerance, the more precise the machining process must be.

Surface Finish:A smooth surface finish is essential for minimizing friction and wear within linear motion systems. The desired surface finish can be achieved through proper selection of cutting tools, feed rate, spindle speed, and coolant use.

Tool Selection:Choosing the right cutting tool for your specific application is paramount to achieving accurate and consistent results. Consider factors like tool material, geometry, and coating to ensure the best performance and longevity.

Best Practices for CNC Turning Linear Shafts

Adhering to best practices can help ensure optimal results when CNC turning linear shafts:

1. Optimize Tooling:Use sharp, well-maintained cutting tools and make sure they are properly set up and aligned.

2. Monitor Coolant:Consistently apply the appropriate type and amount of coolant to the workpiece and cutting tool to help dissipate heat, improve surface finish, and enhance cutting performance.

3. Optimize Speeds and Feeds:Properly balancing your spindle speed, feed rate, and depth of cut can lead to a more efficient, accurate, and consistent machining process.

4. Minimize Workpiece Distortion:Securely and uniformly clamp the workpiece in the lathe, taking care to minimize distortion and deflection during the machining process.

5. Test and Inspect:Carefully inspect your linear shafts throughout the machining process to ensure they meet the required tolerances and specs.

Alternate Machining Options

While CNC turning is often the go-to method for manufacturing linear shafts, it's worth considering other machining alternatives that can deliver similar results. Some options include:

CNC Milling:In cases where a live tooling lathe isn't available, CNC milling machines can be used to produce linear shafts by employing multiple operations like facing, profiling, and boring.

Grinding:For applications demanding ultra-tight tolerances and superior surface finishes, grinding can be an excellent choice for creating linear shafts. In this process, abrasive materials remove material from the workpiece to achieve the desired dimensions and finish.

Ultimately, mastering CNC turning for linear shafts involves understanding the nuances of materials, machining processes, and best practices. Embrace these concepts to create linear shafts that not only meet but exceed performance and longevity expectations in applications across various industries. With attention to detail, proper tooling, and a commitment to quality, you are well on your way to producing exceptional linear shafts via CNC turning.

best cnc turning linear shaft

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.


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

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