Various G-Codes are used to control feed rates in CNC machines. Among them, G95 Feed Per Revolution is an important command, which controls the feed rate per spindle revolution.This code links the feed rate to the spindle speed, and this is the basis for a better surface finish and longer tool life. G95 stands for…
G21 is a G-Code command that tells the CNC machine that all positions, distances, and feed rates should now be understood in metric units (millimeters). When G21 is used, the CNC machine understands all relevant linear measurements in millimeters (mm). G21 = Metric mode (millimeters, and feeds in mm/min or mm/rev)G20 = Inch mode (its…
The following CNC lathe program demonstrates a simple external threading operation using the G33 threading cycle. In this example, the CNC lathe cuts an M20 × 2.0 metric thread over a 30 mm length in a single threading pass. This program is intentionally kept very simple and uses a single threading pass without multiple cutting…
This program shapes a round metal part using simple steps: G-Code Program O0001 (TAPER AND RADIUS EXAMPLE)G21 G40 G99 – Sets units to metric (millimeters), Cancel tool comp, Sets the feedrate.T0101 – Select Tool 1 and Offset 1.G96 S180 M03 – Constant Surface Speed 180 m/min, Starts the spindle rotating in the clockwise direction.G00 X52.0…
Short and standard G-code CNC program example for slot milling (often called pocket milling or slotting with a flat end mill). This example using an 8 mm flat end mill to cut a slot that is 10 mm wide, 50 mm long, and 5 mm deep in a workpiece made of aluminum or steel. M03…
Here is a simple, standard Fanuc-style CNC lathe program for facing and OD (outside diameter) turning. Below is a step-by-step guide and a complete, commented program example for a basic part. Programming Structure Example CNC Turning Program G-Code Reference O0001 (FACE AND TURN PROGRAM)G28 U0 W0 – Sends the machine axes (X and Z) back…
In Fanuc controllers, the G33 code is used for thread cutting. It is usually used more on CNC lathes, but in some special cases it can also be used on CNC mills. Syntax Z : The final depth coordinate of the thread. F : The lead/pitch of the thread.
Here is a complete, standard Fanuc-style CNC milling program example demonstrating the use of G41 (Cutter Radius Compensation Left) and G40 (Compensation Cancel). Simple CNC Mill Program Example This program mills the outside of a 50mm x 50mm square using a 10mm diameter end mill (Radius = 5mm). Program Overview Explanation of CNC G-Code O1001…
Here is a simple example of how G91, G41 and G43 work together in a Fanuc-compatible CNC milling program. This is a standard Fanuc-style CNC milling program written in inches (G20) using absolute (G90) and incremental (G91) positioning modes. It performs a simple rectangular pocket or contour milling operation using cutter radius compensation (G41).
When we make a radius (R) on a corner or edge while cutting on the outside of a job, it is called Outside Turning with Radius. This process eliminates the sharp corners of the job. Example of a Simple CNC Program Description: Outside profile turning operation featuring straight cuts, an R8 mm fillet, and an…
This is a standard CNC G-code program (specifically for a CNC lathe using Fanuc or compatible controls) for turning a cylindrical part. Detailed explanation of the code O0001: This is the program name or number by which the machine recognizes it. G21: This means that all measurements will be in millimeters. G90: This activates the…
Fanuc Alarm 37: CAN NOT CHANGE PLANE IN CRC Fanus Control Model: Fanuc 0i, 16i, 18i, 21i, 31i Series Description The Fanuc Alarm 37 occurs when the control encounters a command to switch the active work plane (G17, G18, or G19) while Cutter Radius Compensation (CRC), also known as G41 or G42, is active. How…
Two very important commands are used to eliminate sharp corners of a workpiece or give them a specific shape: Chamfer and Radius. Through these commands, you can round the corners according to the design or create a bevel. The advantage of this is that the workpiece will be safer to handle, its strength will increase,…
Facing is the process of making the top surface of a workpiece perfectly smooth, straight and level. It is widely used in CNC machines. In this process, the cutting tool usually moves in the X and Y axes and cuts the material in a small depth (Z axis) to eliminate the uneven surface. Facing is…
Before you start writing a CNC program, it’s essential to understand your machine. First, identify the type of CNC machine you are using, such as a milling machine, lathe, or router. Next, take note of the axes it operates on—most machines have three axes (X, Y, Z), though some may have more. Finally, know the…
What is G00? G00 is a rapid positioning command used in CNC programming. It tells the CNC machine to move the tool quickly from one position to another without performing any cutting operation. The main purpose of G00 is to save time by allowing the tool to travel at the machine’s maximum speed when it…
In CNC programming, the M03 (or M3) command is used to start the spindle in a clockwise direction. For the command to work correctly, it must be paired with an S word, which defines the spindle speed in Revolutions Per Minute (RPM). The standard format for starting the spindle is: G97 S[speed] M03 Simple G-code…
In the world of precision manufacturing, CNC (Computer Numerical Control) machines are the workhorses that turn raw materials into intricate components. While both CNC milling and CNC turning are subtractive manufacturing processes—meaning they remove material to create a final shape—they operate on fundamentally different mechanical principles. The primary difference lies in which part moves: In CNC milling,…
In CNC programming (specifically for lathes/turning centers), T0101 is a command used to select a specific tool and its associated offset. It is most commonly found in Fanuc, Haas, and similar control systems. The code is typically split into two parts: Why are there four digits? While it is common to see the numbers match (like T0101, T0202, or T0505),…
CNC (Computer Numerical Control) lathe programming might seem like learning a foreign language at first, but it follows a very logical structure. Most industrial lathes use Fanuc-style controls, which rely on G-codes (preparatory functions) and M-codes (miscellaneous functions) to tell the machine exactly how to move, spin, and cut. Think of a CNC program as a recipe: you define the…