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Decoding the CNC Turning G Code: A Comprehensive Guide

If you are a newcomer to the world of Computer Numerical Control (CNC) machining or even if you are an experienced machinist, CNC turning G codes always seem to generate a fair level of interest - and for excellent reasons. Here, we delve into the nitty-gritty of these codes and provide valuable insights that the modern-day operator or programmer could find immensely useful.

Unraveling the Mysteries of G Codes

The system of G code is the lifeblood of the CNC machine, the communication protocol that tells the machine how to produce the part from the block. These G codes are the backbone of any CNC machine, whether it*s a milling, laser cutting, or turning machine. For this post, we focus our attention on the turning machine and the related G codes.

Every G code tells the CNC machine to perform a certain task. For example, G00 and G01 handle rapid movements and linear interpolation, respectively. G codes dictate both movement and non-movement commands: while G00 to G03 govern machine activities, G20 and G21 control the units being used (inches or millimeters).

Common Codes and Their Functions

To start with a couple of basic and commonly used ones, G00 and G01 are employed for positioning and linear interpolation. G02 and G03 are applied in circular interpolation (clockwise and counterclockwise, respectively).

While every CNC machine might not use or recognize every G code, a basic set of codes is common among nearly all machines. So, let's consider some of the most common CNC turning G codes:

G00- Positioning at rapid speed; Machine travels in a straight line.

G01- Linear interpolation; Machine travels to a point at a regulated speed.

G02- Circular interpolation clockwise.

G03- Circular interpolation counterclockwise.

G04- Dwell; This code makes the machine pause for a specific amount of time.

The list goes on with various codes performing different tasks such as canned cycles for drilling - G81, G82, and G83, among others.

Examining a Real-World Example

To better understand how these codes work together, let's review an example. Here, a CNC lathe has the G code program:

% O1234 T01 M06 S500 M03 G00 X3.47 Z0.1 G01 Z-1.25 F0.02 G00 X5.0 Z5.0 M30 %

From the codes, we understand that it runs a machining operation that includes tool change, spindle start, rapid positioning, linear feed, and the end of the program.

Digging Deeper into CNC Turning G Codes

Exploring these G-codes helps novices and experts alike in CNC machining to better understand, learn, and optimize the use of these machines. Learning these codes can prove to be an invaluable asset in your machining journey whether you want to create a new part, troubleshoot a code lineup, or optimize a slow-running operation.

To even the seasoned machinists out there, keep in mind that G codes have evolved, and some newer machines use slightly different codes or additional codes for advanced control. To master the CNC turning G codes, one needs to constantly learn, explore, test, and adapt.

Remember, the coding language of CNC is the enabler of all that happens in the world of manufacturing. So, understanding G codes is not just necessary, but it is an essential skill that every CNC machinist should consider mastering.

I hope this has been an eye-opener into the world of CNC turning G codes. As you dive deeper into this, the complex strings of codes will start making perfect sense and you'd see them less as cryptic codes and more as the language of manufacturing precision. Happy coding!

cnc turning g code list

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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