Understanding G-Code: A Simple Guide for CNC Beginners

May 16, 2026

G-Code is the programming language used by CNC machines. It tells the machine how to move, where to cut, and at what speed. While you dont need to write G-Code manually if you use CAM software, understanding the basics helps in better control and troubleshooting.

Common G-Code Commands

• G00 Rapid positioning (fast movement without cutting)
• G01 Linear interpolation (straight line cutting)
• G02 Circular interpolation clockwise
• G03 Circular interpolation counter-clockwise
• G90 Absolute positioning mode
• G91 Incremental positioning mode
• M03 Spindle ON (clockwise)
• M05 Spindle OFF

Why Learn G-Code?

Knowing basic G-Code helps you understand what your CAM software is generating. It also allows you to make small manual adjustments when needed and debug issues more effectively.

Final Thoughts

You dont need to become an expert in G-Code to operate a CNC machine. However, having a basic understanding will make you more confident and capable as a CNC user.

Akriti Precision Systems machines work well with popular control software like Universal G-Code Sender (UGS), making it easier for beginners to get started.