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Milling is a manufacturing process that uses a machine tool called a milling machine to remove material from a raw workpiece using rotating cutting tools. It allows the creation of highly precise parts, smooth surfaces, and complex shapes.

Milling can be used on a wide range of materials, including metals (steel, aluminum, copper, titanium), plastics, composites, and sometimes softer materials like wood. The choice of material depends on the mechanical properties required for the final part.

Milling is used in many sectors such as aerospace, automotive, mold manufacturing, industrial and mechanical part production, and in the production of tools and prototypes. It is ideal for creating complex or custom parts, such as gears, housings, plates, and structural components.

CNC milling offers several advantages over traditional manual methods. First, it ensures increased precision due to computer numerical control, enabling parts to be made with very tight tolerances and flawless finishes. It also eliminates human errors and improves repeatability, essential for the mass production of identical parts. CNC milling is also faster, as it allows continuous operation without interruption, thus reducing production times. Finally, the ability to machine complex shapes, often impossible to achieve manually, makes it an ideal solution for projects requiring high technical complexity.

Several types of milling cutters are used depending on the specific needs of the part to be machined. Cylindrical cutters are used for surface milling and milling large flat surfaces, ball-end mills allow for complex contours and 3D shapes, while dovetail cutters are ideal for grooves and assemblies. Inserted-tooth cutters offer increased flexibility as they allow for replacing worn inserts without replacing the entire cutter. Finally, chamfer mills are used for angled edges or chamfers, improving the finish of the machined part. Each type of cutter is designed to meet precise needs, whether it be for precision, finishing, or cutting speed.

GM Precision offers extensive expertise, state-of-the-art equipment, and personalized service to meet the specific needs of each client. Our next-generation CNC machines ensure maximum precision and fast execution while guaranteeing quality and meeting deadlines.

In milling, it’s the cutting tool that rotates while the part generally stays fixed, allowing for flat surfaces, grooves, and complex shapes. In turning, it’s the opposite: the part rotates around its axis while the tool stays stationary, a method ideal for cylindrical parts. Many projects actually combine both processes to achieve a complete geometry.

Our CNC milling centers can achieve tolerances as tight as a few thousandths of an inch, depending on the material, the part’s geometry, and the type of cutter used. Each project is individually assessed to confirm realistic tolerances applicable to your application.

Conventional 3-axis milling moves the tool along three linear directions, while multi-axis milling (4 or 5-axis) adds rotational movements that allow multiple faces of a part to be machined in a single setup. This approach reduces the number of handling steps and improves overall geometric precision, particularly for parts with complex angles.

Lead time depends on the part’s complexity, the required material, and the requested production volume. We establish a realistic timeline as soon as we’ve reviewed your technical drawing and remain transparent about production constraints, including for urgent orders.