G-Code for CNC Programming (2022 Update)

Marti Deans May 24, 2018

8 min read

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g-code

You know what they say about fundamentals: learn them first, and you’ll remember them forever. The same holds true for CNC machine programming. Even as new manufacturing technologies unfold, the fundamentals for how parts are machined with a CNC program will stay with you forever.

In this article, we’ll be talking about the core component of every CNC program – G-code.

G-Code at a Glance

Manufacturers all around the world use CNC programming to control a machine’s tools to produce parts. At the heart of this automated manufacturing process is a set of instructions that tells a CNC machine where – and how – to move. These instructions are called G-Code.

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G-code was first established in the 1960s by the Electronics Industry Association (EIA). While the official language was documented as RS-274D, you’ll hear everyone refer to it as G-code. Why? Many of the words, or individual pieces of code, that make up this machine-based language start with the letter G.

While G-code is supposed to be a universal standard, you’ll find that many CNC machine companies have developed their own unique flavor. We’re all be eating ice cream at the end of the day, but a Haas might be strawberry flavored, and a Tormach might be chocolate flavored. Because of this difference in G-code flavors, it’s imperative to understand how your own machine uses G-code.

Why the difference in G-code flavors? It really comes down to the capabilities of each machine. Take one machine that can process a coordinate system rotation based on probe inputs. You’ll need a set of G-code commands that can enable or disable this rotation. Another machine without this adjustment capability won’t require that G-code.

When in doubt, always refer to your CNC machine’s documentation as you work through the rest of this article. We’ll be walking through the basics, but you never know if your machine might have taken a slightly different path to the same end destination.

G-Code Blocks

The G-code standard was published back in the days when machines had small amounts of memory. Because of this memory limitation, G-code is an extremely compact and concise language that might almost seem archaic at first glance. Take, for example, this line of code:

G01 X1 Y1 F20 T01 M03 S500

In this single line, we’re giving the machine a series of instructions:

Multiple lines of G-code like these combine to form a complete CNC program. Your CNC machine will then read the code one line at a time from left to right and top to bottom, like reading a book. Each set of instructions is on a separate line or a block.

G-Code Programs

The goal of every G-code program is to produce parts in the safest and most efficient way possible. To achieve this, you’ll typically find G-code blocks arranged in a particular order like this:

  1. Start the CNC program.
  2. Load the required tool.
  3. Turn the spindle on.
  4. Turn the coolant on.
  5. Move to a position above a part.
  6. Start the machining process.
  7. Turn the coolant off.
  8. Turn the spindle off.
  9. Move away from the part to a safe location.
  10. End the CNC program.

This flow is a simple program using only one tool for one operation. In practice, you will typically rinse and repeat steps 2 through 9. For example, the G-code program below encompasses all of the code blocks above with repeating sections where needed:

Example of a CNC G-code program with explanations of each code block

Modals and Address Codes

Like other programming languages, G-code can repeat an action indefinitely until stopped. This looping process uses modal code, which acts until you either turn it off or modify it with another modal code. For example, M03 is a modal code that will run a spindle indefinitely until you tell it to stop with M05. Now, wait a second. That word (remember: a word is a little piece of code) didn’t start with a G, but it’s still G-code. Words that start with an M are machine codes, and they turn machine functions like coolant, spindle, and clamps on or off. I’ll list some common ones in the next section, but you can find a list of your machine’s M-codes in its documentation.

G-code also includes a complete list of address codes. You can think of these as the dictionary for G-code that defines particular behaviors. Address codes begin with the letter designation, like G, and then with a set of numbers. For example, X2 defines an X-coordinate address code, where 2 is the value on the X-axis to move the machine to.

The complete list of address codes includes:

Examples of address code parameters

Several special character codes can be added to a G-code program. These are typically used to start a program, comment out text, or ignore characters and include:

G-Codes & M-Codes Explained

G & M-codes will make up the bulk of your CNC program. Codes that begin with G prepare your machine to perform a specific type of motion. The most common G codes that you’ll encounter time and time again in every CNC program include:

G0 – Rapid Move

This code tells a machine to move as fast as possible to a specified coordinate position. G0 will move the machine axis by axis, meaning that it will first move along both axes and finish the move on whichever axis is not in positions. You can see an example of this motion in the image below:

Diagram showing the motion of a G00 rapid move

G1 – Linear Move

This code tells a machine to move in a straight line to a coordinate position with a defined feed rate. For example, G1 X1 Y1 F32 will move the machine to coordinates X1, Y1, at a feed rate of 32.

G2, G3 – Clockwise Arc, Counter-clockwise Arc

These codes tell the machine to move in an arc to a coordinate destination. Two additional coordinates, I and J, define the arc’s central location as shown below:

Diagram showing CW and CCW arc interpolation using G02 and G03

G17, G18, G19 – Plane Designations

These codes define what plane an arc will be machined on. By default, your CNC machine will use G17, which is the XY plane. The other two planes are shown in the image below:

Plane selection diagram showing XY, YZ, and ZX planes

G40, G41, G42 – Cutter Diameter Compensation

These codes define the cutter diameter compensation, or CDC, which allows a CNC machine to position its tool to the left or right of a defined path. A D-register stores the offset for each tool.

Diameter offset table with example values in tool 1.

G43 – Tool Length Compensation

This code defines the length of individual tools using a Z-axis height. This allows the CNC machine to understand where the tip of a tool is in relation to the piece it is working on. A register defines the tool length compensations, where H is the tool length offset and Z is the tool’s length.

Tool Length offset table with tool length value examples

G54 – Work Offset

This code is to define a fixture offset, which determines the distance from a machine’s internal coordinates to the datum on a workpiece. In the table below, only G54 has an offset definition. However, you can program multiple offsets if a job requires machining multiple parts at once.

Work Offset table with values for a work offset included in the G54

M-codes

M codes are machine codes that might differ between CNC machines. These codes control functions on your CNC machine like coolant and spindle directions. Some of the most common M-codes include:

Sample of common machine codes or m-codes

Canned Cycles in G-Code

The last aspect of G-code to touch on is canned cycles. These are similar to methods or functions in computer programming. They allow you to perform a complicated action in only a few lines of code without having to type out all of the details.

Take, for example, the canned cycle below. Here we are telling the CNC tool to create a hole with a peck drill in only two lines of code on the left. This same action takes over 20 lines of regular G-code.

Canned Cycle vs Expanded G Code

Common drill cycles

G81 – Simple Drill Cycle

This cycle will make a hole by plunging to a specific Z-axis coordinate and then retracting. Programming this cycle requires a depth, feed rate, XY coordinates, and plane to drill on.

g81-simple-drill-cycle

G83 – Peck Drill

This cycle is for quickly drilling deep holes. A tool will first drill a defined distance and then retract, which clears any material out of the hole and allows coolant to flush away chips. This cycle’s simplest implementation requires an initial height, feed plane, peck increment, and depth.

Diagram showing peck drilling motion and parameters

G98 – Return to Initial Rapid Height

This cycle will retract a tool to a clearance plane between holes, which helps to avoid clamps. Programming this cycle requires an initial height and feed plane to drill on.

G98 - Return to Initial Rapid Height

Fundamentals First

Even if you never end up writing your own CNC program by hand, understanding G-code’s fundamentals will give you a leg up in your CNC programming career. The core behavior remains intact across manufacturers, even as the actual G-code differs slightly. At the end of the day, you’re combining coordinates, feed rates, and a set of definable actions to move a tool and machine a part successfully.

Some guides recommend memorizing the most common G and M codes. While this might work, practice makes perfect! Continuously use and refresh your G-code fundamentals throughout your career and they’ll stick with you. Here’s a quick quiz to see where you’re at.

Ready to put your CNC programming and G-code knowledge to work? Try Fusion 360 today!

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Adobe Target
We use Adobe Target to test new features on our sites and customize your experience of these features. To do this, we collect behavioral data while you’re on our sites. This data may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, your IP address or device ID, your Autodesk ID, and others. You may experience a different version of our sites based on feature testing, or view personalized content based on your visitor attributes. Adobe Target Privacy Policy
Google Analytics (Advertising)
We use Google Analytics (Advertising) to deploy digital advertising on sites supported by Google Analytics (Advertising). Ads are based on both Google Analytics (Advertising) data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Google Analytics (Advertising) has collected from you. We use the data that we provide to Google Analytics (Advertising) to better customize your digital advertising experience and present you with more relevant ads. Google Analytics (Advertising) Privacy Policy
Trendkite
We use Trendkite to deploy digital advertising on sites supported by Trendkite. Ads are based on both Trendkite data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Trendkite has collected from you. We use the data that we provide to Trendkite to better customize your digital advertising experience and present you with more relevant ads. Trendkite Privacy Policy
Hotjar
We use Hotjar to deploy digital advertising on sites supported by Hotjar. Ads are based on both Hotjar data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Hotjar has collected from you. We use the data that we provide to Hotjar to better customize your digital advertising experience and present you with more relevant ads. Hotjar Privacy Policy
6 Sense
We use 6 Sense to deploy digital advertising on sites supported by 6 Sense. Ads are based on both 6 Sense data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that 6 Sense has collected from you. We use the data that we provide to 6 Sense to better customize your digital advertising experience and present you with more relevant ads. 6 Sense Privacy Policy
Terminus
We use Terminus to deploy digital advertising on sites supported by Terminus. Ads are based on both Terminus data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Terminus has collected from you. We use the data that we provide to Terminus to better customize your digital advertising experience and present you with more relevant ads. Terminus Privacy Policy
StackAdapt
We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
The Trade Desk
We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
RollWorks
We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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Your experience. Your choice.

We care about your privacy. The data we collect helps us understand how you use our products, what information you might be interested in, and what we can improve to make your engagement with Autodesk more rewarding.

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Explore the benefits of a customized experience by managing your privacy settings for this site or visit our Privacy Statement to learn more about your options.