The first step in CNC milling is creating a 3D digital design of the part or component to be milled using computer-aided design (CAD) software. The design is then converted into a format that can be read by the CNC milling machine.

The converted design is loaded into the CNC milling machine's computer control system, which converts it into machine-readable code (G-code). This code contains instructions on how the cutting tool should move and remove material from the workpiece.

The workpiece is then secured onto the milling machine's worktable using clamps or other methods. The cutting tool is also installed and adjusted according to the required specifications.

Once everything is set up, the CNC milling machine is started, and the cutting tool moves according to the G-code instructions. The cutting tool removes material from the workpiece in a series of passes until the desired shape is achieved. During the milling process, the cutting tool may need to be changed or adjusted to achieve the desired result.

After the milling process is complete, the workpiece may require additional finishing steps, such as sanding or polishing, to achieve the desired surface finish.