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Mastering Taper Turning in CNC Programming: A Comprehensive Guide

Taper turning is an essential skill for CNC machinists. It involves cutting along the workpiece's surface at an angle to produce a conical or taper shape. This technique is frequently used in manufacturing applications, such as creating shafts, gas nozzles, and other parts with non-linear profiles. In this blog post, we will explore taper turning in-depth and provide a step-by-step guide for CNC programming.

Understanding Taper Turning

In general, there are four common types of tapers in CNC machining:

1. Constant taper:The angle of the taper remains constant throughout the cutting process.

2. Variable taper:The angle of the taper varies along the length of the workpiece.

3. Composite taper:A combination of constant and variable tapers.

4. Interrupted taper:A taper with intermittent sections of constant diameter.

Taper turning in CNC programming can be accomplished using a variety of methods, such as the X and Z axes coordination for a lathe machine or the G02 and G03 commands for a milling machine. The method chosen will depend on the type of taper required and the machinery being employed.

Taper Turning with Lathe Machine

Using a lathe machine, the workpiece rotates while the cutting tool moves along the X and Z axes to create the desired taper. Here's a sample CNC program illustrating a simple constant taper turning process:

O1000G21 G40 G90T0101G54G00 X40 Z2G01 Z-50 F100G02 X10 Z-100 R30G00 X40G00 Z2M30

In this example, we've accomplished the following steps:

1. Initialized the CNC program with the O1000 command.

2. Set the CNC to metric unit system (G21), canceled cutter diameter compensation (G40), and opted for absolute positioning (G90).

3. Selected and indexed the cutting tool with the T0101 command.

4. Established the work coordinate system using the G54 command.

5. Set the initial positioning coordinates along the X and Z axes (G00 X40 Z2).

6. Executed a linear cut along the Z-axis (G01 Z-50 F100).

7. Performed the taper turning operation using a circular interpolation command (G02 X10 Z-100 R30).

8. Returned the tool to the starting position (G00 X40 Z2) and ended the program with the M30 command.

Taper Turning with Milling Machine

For a milling machine, the spindle rotates while the workpiece remains stationary. The cutting tool moves along the X, Y, and Z axes to produce the desired taper. This example demonstrates taper turning with a milling machine using a G02 command (clockwise arc):

O2000G21 G40 G90G54T0202M03 S1000G00 X20 Y20 Z20G01 Z5 F200G02 X30 Y40 Z-20 I5 J0 K0G00 Z20M05M30

This program includes:

1. CNC initialization with the O2000 command.

2. Metric unit system setup (G21), cancellation of cutter diameter compensation (G40), and absolute positioning mode application (G90).

taper turning cnc programming with an example

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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