CNC milling is a process used to create parts with complex shapes and features from a variety of materials. It is a subtractive manufacturing process, meaning that material is removed from the workpiece to create the desired shape. CNC milling is a versatile process that can be used to create a wide variety of parts, from simple to complex.

The first step in the CNC milling process is to create a CAD (Computer Aided Design) model of the part. This model is then used to generate the CNC code, which is a set of instructions that tells the CNC machine how to move and cut the material. The CNC code is then loaded into the CNC machine, which is then ready to begin the milling process.

The CNC machine is equipped with a spindle, which is a rotating cutting tool. The spindle is connected to a motor, which is used to rotate the spindle at a high speed. The spindle is also connected to a tool holder, which holds the cutting tool in place. The cutting tool is then moved around the workpiece in a series of linear and rotational motions, cutting away material to create the desired shape.

The CNC machine is also equipped with a workholding device, which is used to secure the workpiece in place. This device can be a vise, a clamp, or a fixture. The workholding device is used to ensure that the workpiece is held securely in place while the cutting tool is moved around it.

Once the CNC code is loaded into the CNC machine, the cutting process can begin. The CNC machine will move the cutting tool around the workpiece in a series of linear and rotational motions, cutting away material to create the desired shape. The cutting tool is moved at a predetermined speed and depth, which is determined by the CNC code.

The CNC machine is also equipped with a coolant system, which is used to keep the cutting tool and workpiece cool during the cutting process. The coolant system is used to reduce friction and heat, which can cause the cutting tool to wear out quickly.

Once the cutting process is complete, the CNC machine will move the cutting tool away from the workpiece and the part is ready for inspection. The part is then cleaned and inspected for any defects or imperfections. If any defects are found, they can be corrected by re-milling the part or by using a finishing process such as sanding or polishing.

CNC milling is a versatile process that can be used to create a wide variety of parts, from simple to complex. It is a subtractive manufacturing process, meaning that material is removed from the workpiece to create the desired shape. CNC milling is a precise process that requires careful planning and programming, but it can be used to create high-quality parts with complex shapes and features.