In chapter 1 lesson 9, we introduce G-code and how CNC machines understand and execute your designs.

We’ll break down how machines track position using machine home and work coordinate systems, and how offsets allow you to define where your part exists in space. From there, we’ll walk through the basics of G-code, including common commands for movement, spindle control, feed rates, and tool changes. You’ll also see how these commands come together to control every step of the machining process.

What you’ll learn in this episode:

• The difference between machine home and work coordinate systems
• How work offsets define part position in the machine
• What G-code is and how it controls CNC machines
• Common commands for movement, spindle speed, and tool changes
• How CNC programs are structured and executed