How does CNC programming work for metal fabrication?

CNC programming involves creating a digital set of instructions (via G-code or M-code) that directs the CNC machine’s tools and movements:
  1. First, a 2D/3D CAD (Computer-Aided Design) model of the part is created.
  2. The CAD file is converted to CAM (Computer-Aided Manufacturing) software, which generates toolpaths (the path the cutting tool will follow).
  3. The CAM program outputs G-code (e.g., “G01” for linear movement, “M03” for spindle activation), which is loaded into the CNC machine.
  4. The operator verifies the program (via simulations) before running the actual fabrication to ensure accuracy.