CNC Milling

Custom CNC Milling Services

Milling is a machining process that involves the use of rotating cutters to remove material from a workpiece. Furthermore, there are two main types of milling operations; face milling and slab milling.

Face Milling

Face milling is a machining manufacturing process used for smoothening or flattening the surface of workpieces.

Slab Milling

Slab Milling refers to the use of a cylindrical milling cutter to cut parallel to the workpiece surface, with the entire width or a portion of the milling cutter in contact with the workpiece, thereby achieving large-area material removal.

High Quality Rapid CNC Milling Service

GM-PRE integrates seamlessly with over 10,000 qualified manufacturing partners, including ISO 16949 registered CNC milling facilities. That massive network means that whatever your part, we have a shop and machine to make it. We support 3-axis, 4-axis, 5-axis, and right-angle milling capabilities to help you rapidly create designs from simple straight lines to complex geometric shapes.

GM-PRE offers instant pricing, on-demand lead times, and design-for-manufacturability feedback on materials and manufacturing processes for your custom CNC-milled parts, regardless of industry.

Precision is at the heart of our CNC Milling services. We specialize in producing Precision CNC Milling Parts with tight tolerances, ensuring every component meets the highest standards of accuracy. Our advanced equipment and skilled technicians enable us to achieve micron-level precision, making us the go-to choice for industries that demand exacting specifications. Whether it’s a single prototype or high-volume production, our CNC precision milling capabilities guarantee parts that fit seamlessly into your assembly and perform flawlessly.

CNC Materials

Materials Available at Guanmei PRE

Available Surface Treatment

Anodizing/Hard Anodizing

Mainly used for aluminum alloy parts, it forms an oxide film through electrolysis to improve corrosion resistance, surface hardness, and aesthetics.

Hard Anodizing is a thickened version with higher wear resistance and insulation, suitable for mechanical friction parts.

We provide a value-added service of CNC Milling + Anodizing (Type II/III) for aluminum components. After the precise CNC milling process, anodizing (Type II for general corrosion resistance and aesthetic enhancement, or Type III for increased hardness and wear resistance) is applied. This not only improves the part’s appearance but also significantly extends its service life, making it suitable for applications in electronics, consumer goods, and architectural hardware.

Nickel Plating

A layer of nickel metal is deposited on the surface of CNC metal parts to enhance corrosion resistance, wear resistance and appearance brightness.

It is divided into chemical nickel plating (electroless nickel plating) and electrolytic nickel plating. The former is suitable for high-requirement precision parts.

Zinc Plating

A layer of zinc is plated on the surface of steel parts to form an anode protection to prevent rust.

You can choose different appearances such as colored zinc, white zinc, and black zinc.

Black Oxide

A black oxide film is formed on the surface of steel or stainless steel, mainly providing mild rust prevention, anti-light reflection, and aesthetics.

It does not significantly change the size of the parts and is suitable for parts that require both appearance and rust prevention.

Electropolishing

Use electrochemical methods to dissolve small amounts of stainless steel or titanium alloy parts, making the surface smoother, cleaner and free of microburrs.

Improves corrosion resistance and cleanliness, commonly used in the medical, food, and electronics industries.

Blasting

Cleaning or roughening of surfaces with high-pressure blasting of sand/glass beads/ceramic particles, removal of burrs, scale or preparation of adhesion layers.

Suitable for surface pretreatment or matte effects.

GM-PRE High-Speed Milling + Bead Blasting service is designed for parts that require both high-precision machining and a specific surface finish. High-speed milling allows for rapid material removal while maintaining tight tolerances. Bead blasting then refines the surface, providing a uniform matte finish that can improve adhesion for subsequent coatings or simply enhance the part’s aesthetic appeal. This combination is popular in the medical device and consumer electronics industries.

Polishing

Grind and polish the metal surface by mechanical means to obtain a high-gloss, mirror-like or delicate surface.

It is mostly used for part appearance processing, decorative processing or surface roughness control.

Passivation

Mainly used for stainless steel, it removes free iron and impurities through chemical treatment, forms a more stable passivation film, and improves corrosion resistance.

It does not change the size, but can significantly extend the service life of parts.

Dacromet

It is a zinc-chromium coating that provides strong anti-corrosion protection on the surface of steel parts, especially suitable for salt spray environment.

It does not contain heavy metals, is more environmentally friendly, and is often used to replace electrogalvanizing.

Powder Coating

The dry powder is attached to the surface of the parts through electrostatic spraying, and then baked to form a strong, wear-resistant and corrosion-resistant coating.

It has various colors, is environmentally friendly and solvent-free, and is not easy to peel off.

Painting

Traditional surface coating method, you can choose different colors and paint types (such as anti-corrosion paint, high temperature resistant paint).

Used for aesthetics, identification, and basic protection purposes.

PVD

A very hard, thin, wear-resistant ceramic coating (such as TiN, CrN) is physically deposited on the metal surface.

It not only improves the surface hardness, but also achieves a metallic luster or black gold appearance.

For components that require exceptional strength and wear resistance, we offer a unique process combination of Closed-Die Forging → CNC Hard Milling → PVD Coating. Closed – die forging provides a dense and uniform grain structure, enhancing the material’s mechanical properties. Our CNC Hard Milling then shapes the forged part with high precision, and the final PVD Coating adds a protective layer that boosts hardness and corrosion resistance, making it ideal for applications in aerospace, automotive, and high-end machinery.

MIL-A-8625F Type II anodizing improves corrosion resistance and can serve as a base for paint and other surface finish treatments.
Note: The anodizing effect may vary depending on the material.
Additional notes:
Dyes can be used to affect the surface color of the parts.
Type II coatings are prone to wear and may bleach or fade after prolonged exposure to direct sunlight.
Custom colors are available (Pantone).

Applications of CNC Milling

Rapid Tooling

CNC machining enables the quick production of prototype molds and tooling components with high precision. This makes it ideal for creating low-volume tooling used in test runs or bridge production before full-scale manufacturing begins.

Rapid Prototyping

It is an excellent choice for rapid prototyping due to its wide material compatibility, fast turnaround times, and low per-unit costs. It allows engineers and designers to quickly test form, fit, and function using production-grade materials.

End-Use Production

Thanks to its high accuracy, repeatability, and material flexibility, CNC machining is well-suited for producing small to mid-volume end-use parts that meet final product standards without the need for further processing.

Advantages of CNC Milling

CNC milling offers high precision, repeatability, and efficiency for producing complex parts from a wide range of materials.

Types of CNC Mills

3-Axis

The machine moves in three linear axes: X (left and right), Y (front and back), and Z (up and down). The tool orientation is fixed and the workpiece is stationary.

Processing capabilities:

Plane milling (surfaces, grooves, contours).
Simple three-dimensional shapes (bas-relief, asymmetric surfaces).

Accuracy: Typical tolerance ±0.01 mm.

4-Axis

Adding a fourth axis (A axis) to the three axes allows the workpiece to rotate around the X axis (vertical machine tools) or around the Y axis (horizontal machine tools).

Processing capabilities:

Cylindrical surface processing (such as turbine blades, cam profiles).
Multi-faceted parts (such as engraving on each face of a cube) do not require repeated clamping.

Accuracy: Tolerance ±0.005 mm (dynamic balancing control required).

GM-PRE 4-axis CNC milling machines expand our machining capabilities beyond traditional 3-axis operations. The additional rotational axis allows for more complex part geometries to be machined in fewer setups. This not only improves efficiency but also enhances the precision of the final product. It’s an ideal solution for parts with angled features, helical shapes, or those that require multi-sided machining in industries such as automotive, tooling, and general machinery manufacturing.

5-Axis

Adding two rotation axes (such as A-axis and B-axis/C-axis) to the 3-axis allows the tool or workpiece to be tilted in multiple directions.

Processing capabilities:

Complex 3D surfaces (impellers, turbine blades, bone implants).
Deep cavity structures (mold cavities, aerospace structural parts).

Accuracy: Tolerance ±0.003 mm (thermal deformation compensation technology required).

GM-PRE’s 5-axis CNC Milling machines offer unparalleled flexibility and precision (±0.005mm). With five-axis simultaneous machining, we can produce complex geometries that are impossible or extremely difficult to achieve with traditional 3 – or 4-axis machines. This technology is especially beneficial for aerospace components, medical implants, and high-end mold making, where intricate shapes and tight tolerances are the norm.

Why Choose GM-PRE For Custom Milling

Our state-of-the-art milling processes enable us to create complex and unique parts to your specifications.

Material Versatility

GM-PRE masters the machining of 40+ materials, from aerospace-grade titanium (Ti-6Al-4V) to medical high-temperature Inconel. Whether you need lightweight aluminum for automotive chassis, biocompatible stainless steel (316L) for surgical tools, our expertise ensures optimal material performance.

Cross-Industry Expertise

With 15+ years of experience, GM-PRE delivers precision-milled components for aerospace, medical, automotive, and other sectors. We can craft titanium engine mounts for supersonic drones and micro heat sinks for AI servers, our engineers understand industry-specific challenges.

Quality Assurance & Certifications

Every GM-PRE part is backed by ISO 9001, ISO 16949 certifications, with full traceability from raw material to final inspection. Our 100% dimensional checks (CMM/3D scanning), X-ray testing for aerospace welds, and RoHS-compliant finishes guarantee reliability.

The surface finish of milled parts is a critical aspect of our CNC Milling services. Our milling machines are equipped to achieve a variety of surface finishes, from a smooth, polished look to a textured, matte finish. We understand that different applications have different requirements for surface finish, and our team is skilled in optimizing the milling process to meet these needs. Whether it’s for aesthetic purposes, to improve functionality, or to enhance the part’s compatibility with other components, our milling machine surface finish capabilities are second to none.

As one of the leading CNC milling companies, we are proud to be recognized as a reliable CNC milling services supplier. Our network of CNC milling shops is equipped with the latest technology and staffed by experienced professionals. We not only produce high-quality CNC Milling Parts but also offer comprehensive support, from design-for-manufacturability feedback to rapid prototyping and full-scale production. Whether you need a single component or a complete set of CNC milling components, we have the capacity and expertise to deliver.

CNC Milling

Custom CNC Milling Services

Face Milling

Slab Milling

High Quality Rapid CNC Milling Service

CNC Materials

Aluminum

Brass

Copper

Stainsteel