G and M-Codes In CNC Explained. Difference, Usage And More.

Here We Have Discussed The Functions, Code List, Differences For The M Code, And G Code Of CNC Programming, And Many More.

G Codes And M Codes are two common types of codes used in Computer Numerical Control (CNC) programming. G-codes are primarily used to instruct the machine where to move, while M-codes tell it what type of operation to perform on a given layer.

CNC programmers use these codes by combining them with other instructions inside the program code. This blog post will teach you how to write an effective introduction for your blog posts when writing about coding topics like G Codes And M Codes!

This introductory paragraph is engaging because it presents information that would be of interest for people who want to learn more about this topic, explain why they should care, and give them some specific advice on how they can do so – all without being too word.


What Are G-Code And M-Code For CNC?

Description Of G-Code And M-Code For CNC
Description Of G-Code And M-Code For CNC

G-Code For CNC

The G code is an alphanumeric language that tells a machine what to do. It has the power of controlling how much material will be removed from one end or another by way of part geometry, and when it should stop machining for final dimensions.

The ‘G’ in this command stands for geometry because most commands start with G which means they are responsible for movements on these machines like where to start, moving forward or backward at different speeds, cutting up materials without damaging them too much before continuing down their path until they reach certain destinations while also telling the system where not to cut so as not waste any time there; all sorts of stuff!

This coding might seem simple enough but can get complicated pretty quickly since every single software reads things. The G code is a programming language for computer-controlled machined used to create various products.

The commands are written in an alphanumeric format and start with the letter “G,” meaning that each command starts with “G.” These codes tell machine programs were to begin operations, how they should operate, and when it’s time for them to stop.

But since there are many different kinds of machines out there reading these coding languages differently because some programs using only numbers while others use symbols or letters as well–it can be tough on programmers who need accuracy from their work all the way down into minute details.

Functions Of The G Code For CNC Machine.

NThe N value provides the line number.
GThe G number informs when the tool moves and stop.
X, Y, ZThese values indicate the position of the tool in three dimensions — X for horizontal, Y for vertical, and Z for depth.
FF means to feed the piece with the machine quickly.
SS informs the machine how quickly to move the spindle.
TIt informs the machine which tool to use.
MM values give miscellaneous functions or machine functions, telling the device how to act by giving on and off directions.
I, JThese values indicate the incremental center of any arcs the machine makes.
RR gives the radius of arcs made by the machine.
AValues direct the tool around the x-axis.
BThe number with B shows the rotational value around the Y-axis.
CAn auxiliary axis that rotates around the z-axis gets its positional value from the C value.
DThis number shows how much the system offsets the tool diameter.
LL gives the system a value to indicate repeating operations and how many times they need to loop.
PThe program jumps in time or a delayed time with the P command.

List Of G Codes Of CNC Lathes

G00Rapid Position Motion
G01Linear Interpolation Motion or Linear Motion
G02Circulation Interpolation Motion CW
G03Circular Interpolation Motion CCW
G04Dwell (P) P=Seconds. Milliseconds
G05Fine Spindle Control Motion
G09Exact Stop
G10Programmable Offset Setting

List Of G Codes For CNC Milling

G00Rapid Motion
G01Linear Interpolation Motion
G02CW Interpolation Motion
G03CCW Interpolation Motion
G09Exact Stop
G10Programmable Offset Setting
G12CW Circular Pock Milling
G13CCW Circular Pock Milling
G17XY Plane Selection

M-Code For CNC

One of the many auxiliary codes that can be used in CNC programs is M code, which stands for Miscellaneous Code. This set of commands controls non-cutting actions such as stopping a program or shutting off the machine after it reaches its required temperature.

Machinists refer to the M code as miscellaneous codes because it controls non-cutting actions such as stopping programs, flooding the machine with coolants, and shutting it off after a temperature drop. The M code is one set of auxiliary commands that control all the machine’s non-geometric actions.

Like G codes though they work in blocks or blocks of information (a lot like CNC programming) so be sure to only have one command per block when using them otherwise you run into problems with coordinating multiple requests on machines.

List Of M Codes For CNC Lathes.

M00Program Stop
M01Optional Program Stop
M02Program End
M03Spindle on Forwarding
M04Spindle on Reverse
M05Spindle Stop
M08Coolant On
M09Coolant Off
M10Chuck Clamp

List Of M Codes For CNC Milling

M00Program Stop
M01Optional Program Stop
M02Program End
M03Spindle On Clockwise
M04Spindle On Counterclockwise
M05Spindle Stop
M06Tool Change
M08Coolant On
M09Coolant Off
M104th Axis Brake On

Main Differences

Differences Between G Code And M Code.

Differences Between G Code And M Code
Differences Between G Code And M Code

G and M codes are the most common set of numerical values used in CAM programming. They can be seen on every CNC machine, but there is still some confusion as to what they represent, how to use them, and what their meanings are. This blog will help clear up any misconceptions about G and M codes so that you can get back to work! G-codes are a series of numbers that act as instructions for the CM machine.

The different types of these codes instruct the machine where to move, how much power should be applied during cutting or milling, when to turn off cooling fluid, etc. These codes also tell the machine which tool path it needs to follow along with other specifications such as depth of cut or feed rate. G-code is a computer language for programming CNC machines.

The most common type of G code for CNC machining is g0 which tells the machine where to position itself before it carries out any other operations; this ensures there will be no collisions. G Codes And M Codes in CNC programming are most often used to define the direction of a cutting tool.

G code typically controls the X, Y, and Z axes of the machine while M codes control the A-B axis or rotational movements. The following list will explain how G Codes And M Codes are defined:
G0: moves to specified coordinate without cutting anything. This is usually at 0,0 on the machine’s table. Used for homing purposes.

G1: move cutter in a specified direction at current speed indefinitely or until an endpoint (M) on that path is reached. M0: stops all motion and returns to original position when this command is issued by the operator.
G2: moves cutter in a straight.

How does CNC Programming (G Codes And M Codes) Control CNC Machines?

Before the arrival of computers, machinists used cards or tapes to regulate machine movements. They punched holes on these cards during a specific order to make the codes. While this was also effective at the time, it had been quite tedious.

Also, these cards were susceptible to damage or getting lost within the machine shops. This led to many problems in productions at the time. When machinists started using computers for numerically controlled machines, they still found a couple of problems.

This was because that they had to input the codes manually. this is able to, of course, be very tedious once they were making quite sophisticated parts that required tons of instructions. However, with far more advanced computers and software, machinists can simply instruct the software on what to try to do.

The software will then generate the G codes and M codes that the machine understands. With CAD (computer-aided design) and CAM (computer-aided manufacturing) software, code generation for machine functions has become very easy.

The Power Of Software

Then selects tooling paths while selecting their respective cutters/tools used on various materials or components placed within selected fixtures – this step allows users to visualize what type of cutting action would take place by each cutter against its specific component before actually performing these actions at full speed during real-time simulation through either 2D animation or 3D.


Ending up saying that G Codes And M Codes are the most important types of CNC programming. There are many different G and M codes, each with a specific function. This blog post will cover some of the more popular “G” and “M” Codes that every CNC programmer should know how to use.

Asif Mondal

I am an avid CNC lover and have been a professional for 6 years. I enjoy carrying out the various projects in my backyard, testing all of the latest machines released to do so, and using them to reach others who are interested in sharing their knowledge with me through blog posts like this one! Now that I'm settled down in India working at GeekyViews as part of its editorial team for a few times, when not writing about it on here or taking day trips around the beaches and mountains which helps to boost creativity! You can also find me hiking along trails looking up at soaring eagles or swimming alongside local marine mammals such as dolphins--as well as enjoying fresh-baked artisan bread from nearby bakeries-and more!

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