Troubleshooting Of CNC Cutter

Troubleshooting Of CNC Cutter

Home > The Function of G-Codes in CNC Cutting

The Function of G-Codes in CNC Cutting

G-code, which is also known as G programming language, is the coding standard of CNC machines. CNC machines are used for cutting various materials such as metal, and as these machines are controlled by a computerized system, they need a code to perform any given task.

When use CNC cutting machine, with the help of G-codes, you can command the machine to cut anything according to your requirements.You can determine the cutting speed and cutting tool’s axis through G-codes.

For example:

Move the cutting tool to the place where it’s required cutting.

Move in an arc form or straight line.

Bore a hole, cut any material as per the required measurement or shape the perimeter of a work piece.

Offset setting.

Change the coordinate system.

Most Used G-Codes

CNC machines are manufactured by a number of companies and G-codes may not be the same across all the models as the software package used in various models is not identical.Here are some of the codes that can help you in your work:

G00: Whether the machine features 2 or 3 axis,use this code, it rotates all the axis at a maximum speed until the vector is obtained. Remember that the movement of axis does not happen in a straight line.

Therefore, you should be very careful to avoid a crash.

G01: This is one of the most common codes used for CNC cutting. The program gets an idea of the start and end points, and then calculates the path between them to make sure the final cutting is linear.

G02: This code is used for clockwise circular interpolation. With the help of this code, you can determine the X, Y, Z axis and size of the radius arc to swing the cutting tool. In order to define the radius, you need to write R+ (less than 180 degree) or R- (greater than 180 degree) with the G02 code.

G03: It does exactly the same thing as G02. However, this time, the circular interpolation is counter clockwise.

G04: This code is used for setting the dwell time. “P” defines the exact dwell time. The time is generally set in milliseconds. For example, if you need the CNC machine to dwell for 5 milliseconds, then the code should be G04 P5000 (P1000 means 1 millisecond). Don’t forget that dwell needs to last for 1-2 full spindle rotation in most cases, which takes much less than 1 second. Therefore,setting the dwell time, you must be very careful because a long dwell time means unnecessary waste of time and money.

G20: It’s used for programming in inches, mostly in countries like the UK, USA and Canada.

G21: This code is used for programming in millimeters all over the world. However, if you want to be an expert of CNC cutting, you must know the proper use of both G20 and G21 codes.

G28: It takes the cutting tool to the “home” position.

Does exactly the opposite. It commands the machine to go to a particular XYZ position, returning from the “home” position.

I have mentioned only some G-codes in this article and there are a lot more besides here.

These codes are very important and you must know all of them to make sure run your CNC machine properly. G-codes help you determine the cutting line, depth and much more. Therefore, before you buy a CNC cutter, you need have a good knowledge about the G-code so that after installation of the CNC cutting machine, you and your other workers can do their job effortlessly.


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