Computer numerical control milling is the use of computer-controlled, rotating multi-point cutting tools to remove material from a workpiece to produce a custom-designed part or product. The invention is suitable for the machining of various materials such as metal, plastic, wood, etc., and produces various customized parts and products.

The product has various functions such as mechanical, chemical, electrical, thermal, etc., and has precision CNC machining services. CNC milling is a machining process, which means that material will be removed from the workpiece by mechanical means, such as the action of the cutting tool of a milling machine.

What is milling? Under the umbrella of precision CNC machining services, a variety of functions such as mechanical, chemical, electrical and thermal machining can be provided. Milling was originally performed manually by workers, but now most milling is done by CNC milling machines. CNC milling machines use a computer to monitor the milling process. CNC milling can provide greater precision, accuracy, and productivity, but there are situations in which manual milling can be useful. Manual milling requires technical skills and experience, thus reducing turnaround time. It has the added benefit that a manual mill is cheaper and there is no need to worry about programming the machine.

Like most traditional mechanical CNC machining processes, CNC milling processes utilize computer controls to operate and manipulate machine tools that cut and form blanks. Additionally, the process follows the same basic production stages as all CNC machining processes, including:

The CNC milling process begins with the creation of a 2D or 3D CAD part design. The complete design is then exported to a CNC-compatible file format and converted by CAM software into a CNC machine program that dictates the motion of the machine and the movement of the tool across the workpiece. Before the operator runs the CNC program, they prepare the CNC milling machine by holding the workpiece on the work surface of the machine tool (i.e. the table) or workpiece holder (such as a vise) and mounting the milling tool on the spindle of the machine tool. CNC milling machines use horizontal or vertical CNC powerful milling machines, as well as multi-point rotary (multi-tooth) cutting tools such as milling cutters and drills, depending on the specifications and requirements used. When the machine is ready, the operator starts a program through the machine interface, prompting the machine to perform a milling operation.

After CNC milling begins, the machine tool begins to rotate the cutting tool at several thousand revolutions per minute. Once the CNC machining process is started, the machine tool will start rotating the cutting tool at thousands of revolutions per minute.

Compared with manual milling, in CNC milling, the machine tool usually conveys the movable workpiece through the rotation of the cutting tool rather than relying on the rotation of the cutting tool. Milling operations that adhere to this convention are called climb milling operations, and the opposite operation is called conventional milling operations.

In general, milling is best suited as an adjunct or finishing process for machining workpieces to provide definition or to generate part features such as holes, slots, and threads. However, the process can also be used to shape stock material from start to finish. In both cases, the milling process gradually removes material to create the desired shape and part form. First, the tool cuts small pieces, or chips, from the workpiece to create an approximate shape. The workpiece is then milled at a higher schedule and with greater precision to finish the part with the correct features and specifications. In general, the finished part requires several machining passes to achieve the desired accuracy and tolerances. For parts with more complex geometries, once the milling operation is complete and the part is produced to custom-designed specifications, the milled part goes to the finishing and post-processing stages.

CNC milling is a machining process suitable for prototype, one-off, and small to medium production runs, producing parts with high precision and tolerance. Although parts are generally manufactured to tolerances between +/- 0.02mm to +/- 0.1mm, some milling machines can achieve tolerances of +/- 1 filament or even higher. The versatility of the milling process can be applied to a wide variety of part features and designs, including grooves, chamfers, threads and pockets.

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