G-code program structure in CNC Programming - Mini Project: Build & Apply

G-code Program Structure

📖 Scenario: You are learning how to write a simple CNC machine program using G-code. G-code tells the machine how to move and what actions to perform. Understanding the basic structure of a G-code program helps you create safe and effective instructions for the machine.

🎯 Goal: Build a basic G-code program with the correct structure including program start, tool selection, movement commands, and program end.

📋 What You'll Learn

Create a program start line with a program number

Select a tool with a tool change command

Add movement commands to move the tool to specific coordinates

End the program with a program stop command

💡 Why This Matters

🌍 Real World

G-code programs control CNC machines in factories and workshops to make parts by moving tools precisely.

💼 Career

Understanding G-code structure is essential for CNC programmers, machinists, and manufacturing engineers to create and troubleshoot machine instructions.

1

Start the G-code program

Write the first line of the G-code program to start it with the program number O1000. This line tells the machine the program ID.

CNC Programming

# Write the program start line with program number O1000
# Your code here

Hint

The program start line begins with O followed by the program number.

2

Select the tool

Add a line to select tool number T1 and perform a tool change with command M6.

CNC Programming

O1000 (Program start)
# Add tool selection line with T1 and M6
# Your code here

Hint

Use T1 M6 to select tool 1 and perform a tool change.

3

Add movement commands

Add two lines to move the tool: first to X10 Y10 with rapid move command G0, then to X20 Y20 with linear move command G1.

CNC Programming

O1000 (Program start)
T1 M6 (Tool change to tool 1)
# Add G0 move to X10 Y10
# Add G1 move to X20 Y20
# Your code here

Hint

Use G0 for rapid move and G1 for linear move with coordinates.

4

End the program

Add the program stop command M30 on the last line to end the G-code program.

CNC Programming

O1000 (Program start)
T1 M6 (Tool change to tool 1)
G0 X10 Y10 (Rapid move to X10 Y10)
G1 X20 Y20 (Linear move to X20 Y20)
# Add program end command M30
# Your code here

Hint

The program ends with M30 which stops and resets the program.