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Mastering Taper Turning: CNC Part Programming Techniques and Tips

Welcome fellow machinists and CNC enthusiasts! In this blog post, we'll delve into the fascinating world of taper turning using CNC machines and how to create a relevant part program to ensure the quality of your work. With at least 1000 words, you'll be equipped with techniques and tips to become a taper turning pro.

So, let's get started!

The Basics: What is Taper Turning?

Taper turning is the process of machining a conical shape on a workpiece, either externally or internally, by gradually reducing the diameter along the length of the part. This is widely used in machinery components like shafts and spindles, tool holders, and pipe fittings.

It's essential to have a solid understanding of taper turning processes, as these skills are indispensable for CNC machinists. That's why, in this article, we'll be sharing some tips and techniques for producing perfect tapered parts with your CNC machine.

CNC Part Programming: The Key to Precision Taper Turning

A CNC part program is a series of instructions that controls the machine's movements to produce a desired shape. In the context of taper turning, using proper CNC part programming ensures a workpiece is turned accurately and efficiently.

Here's a basic outline of the steps involved in creating a CNC part program for taper turning:

1. Analyze the workpiece and select the appropriate machine, tooling, and fixtures.

2. Determine the cutting conditions like spindle speed, feed rate, and depth of cut.

3. Identify the starting point and establish the tool path.

4. Write the CNC part program using G-code or conversational programming.

5. Verify the program using simulation software before executing it on the machine.

6. Run the program on the CNC machine to produce the tapered part.

Now let's dive deeper into some useful programming tips and tricks for taper turning.

Tip 1: Select the Right Tooling and Fixtures

When setting up your CNC machine for taper turning, it's crucial to equip it with appropriate tooling and fixtures. For external taper turning, consider using a lathe with a 60-degree included angle for consistent and accurate results. For internal tapers, a boring bar with a corresponding taper angle is recommended.

Tip 2: Utilize G-code Functions for Taper Turning

G-code programming is the industry standard for defining CNC machine tool paths. In the case of taper turning, a popular G-code function is G71 to define a roughing cycle. This initial roughing pass helps to remove the majority of excess material.

After the roughing cycle, use the G01 linear interpolation function combined with the G92 thread cutting cycle to precisely control the taper angle and smoothly follow the desired tool path.

Tip 3: Monitor Cutting Conditions for Optimal Results

Achieving a perfect taper requires careful monitoring and control of the cutting conditions. Ensure the spindle speed, feed rate, and depth of cut are in line with the material and tooling specifications. It's also essential to use proper cutting fluid to minimize friction, heat, and tool wear.

Tip 4: Validate Your Program with Simulation Software

Before executing the taper turning program on your CNC machine, verify it with simulation software. This vital step helps to identify potential issues like tool path collisions, programming errors, and inefficiencies. Plus, it saves valuable time and material costs by avoiding scrapped parts and machine downtime.

Tip 5: Fine-tune Your Taper by Making Adjustments as Needed

Once your program is running on the CNC machine, it's crucial to monitor the process closely and fine-tune if necessary. Always measure your finished parts carefully, using precision measuring instruments like calipers and micrometers, to ensure they meet the desired specifications. If adjustments are needed, tweak your program and re-run it until the desired results are achieved.

There you have it – an in-depth exploration of CNC part programming for taper turning. By following these tips and employing best practices, you'll be well on your way to conquering the challenging yet rewarding skill of taper turning. Keep practicing and experimenting with different techniques to elevate your CNC machining to new heights.

cnc part program for taper turning

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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