CNC Milling Services

China’s trusted source for high-quality precision CNC milling services, offering competitive pricing and rapid lead times.

Certifications : ISO 9001:2015 | AS9100D | ITAR Registered

Over 60 Certified Materials

Custom Finishes

±0.005mm Tight Tolerance

Lead times from 7 days

Qualified CNC Milled Parts from reliable manufacturers

Richconn operates in 15,000 square meters of manufacturing excellence, offering comprehensive services from product design to small batch production. With a team of over 200 skilled employees, including more than 150 experienced CNC technicians, we ensure top-tier precision and quality across all processes. Our facility is equipped with over 100 precision CNC machines, including five-axis, four-axis, and three-axis tools, as well as fully automatic vacuum forming machines, providing multi-functional and high-precision capabilities. Additionally, we utilize 10+ advanced testing instruments to maintain rigorous quality control.

Materials

Richconn engineers can help customers select the right material for the part being developed. For example, the engineers will evaluate whether the material you specify will meet the requirements when stamped, or whether it is likely to have problems such as cracking during production. If so, they will suggest alternatives

Testing and Inspection

To ensure the durability of the entire core stamping of the part, we have a complete in-house facility to conduct a range of tests (including salt spray tests, spring stiffness tests, film thickness tests)

Quality

ISO 9001 (International Organization for Standardization), we also understand UL, CSA, NSF, ETL and CE standards.

Richconn CNC Milling Capabilities

CNC Milling Tolerances

Nominal Size	Plastics (ISO 2768-m)	Metals (ISO 2768-f)
0.5mm ~ 3mm	±0.1mm	±0.05mm
> 3mm ~ 6mm	±0.1mm	±0.05mm
> 6mm ~ 30mm	±0.2mm	±0.1mm
> 30mm ~ 120mm	±0.3mm	±0.15mm
> 120mm ~ 400mm	±0.5mm	±0.2mm
> 400mm ~ 1000mm	±0.8mm	±0.3mm
> 1000mm ~ 3000mm	±1.2mm	±0.5mm
> 2000mm ~ 4000mm	±2mm	–

CNC Milling Capabilities

3-axis CNC milling

Parameter	Metals	Plastics
Max. Part Size (L x W x H)	2300 x 1000 x 650 mm 90.5 x 39.5 x 25.6 in	2300 x 1000 x 650 mm 90.5 x 39.5 x 25.6 in
Min. Feature Size	Ø 0.50 mm Ø 0.019 in	Ø 0.50 mm Ø 0.019 in
Typical Tolerances	±0.01 mm ±0.0004 in	±0.01 mm ±0.0004 in
Surface Finish	Ra 0.8 µm Ra 32 µin	Ra 1.2 µm Ra 47.5 µin
Max. Cutting Feed Rate	20,000 mm/min 785 in/min	20,000 mm/min 785 in/min
Spindle Speed	Up to 20,000 RPM	Up to 20,000 RPM
Tool Change Time	3.3 s	2.2 s

4-axis CNC milling

Parameter	Metals	Plastics
Max. Part Size (L x W x H)	2100 x 1800 x 500 mm 82.6 x 70.8 x 19.7 in	2100 x 1800 x 500 mm 82.6 x 70.8 x 19.7 in
Min. Feature Size	Ø 0.2 mm Ø 0.008 in	Ø 0.2 mm Ø 0.008 in
Typical Tolerances	±0.01 mm ±0.0004 in	±0.03 mm ±0.0012 in
Surface Finish	Ra 0.8 µm Ra 32 µin	Ra 1.2 µm Ra 47.5 µin
Max. Cutting Feed Rate	30,000 mm/min 1180 in/min	54,000 mm/min 2126 in/min
Spindle Speed	Up to 20,000 RPM	Up to 20,000 RPM
Tool Change Time	3.3 s	2.2 s

5-axis CNC milling

Parameter	Metals	Plastics
Max. Part Size (L x W x H)	1385 x 1200 x 900 mm 54.53 x 47.24 x 35.43 in	1385 x 1200 x 900 mm 54.53 x 47.24 x 35.43 in
Min. Feature Size	Ø 0.1 mm Ø 0.04 in	Ø 0.1 mm Ø 0.04 in
Typical Tolerances	±0.01 mm ±0.0004 in	±0.03 mm ±0.0012 in
Surface Finish	Ra 0.8 µm Ra 32 µin	Ra 1.2 µm Ra 47.5 µin
Max. Cutting Feed Rate	50,000 mm/min 1968 in/min	50,000 mm/min 1968 in/min
Spindle Speed	Up to 20,000 RPM	Up to 20,000 RPM
Tool Change Time	0.9 s	0.9 s

CNC Milling Parts Surface Finishes

Anodizing

Anodizing enhances corrosion resistance and allows for vibrant color finishes on aluminum parts.

Electroplating

Electroplating adds a thin, protective metal coating to improve durability and appearance.

Polishing

Polishing smooths the surface to achieve a shiny, mirror-like finish for enhanced aesthetics.

Sandblasting/Shot Blasting

Sandblasting or shot blasting processes creates a matte or textured surface by abrasive blasting.

Powder Coating

Powder coating provides a durable, colored finish that resists chipping, scratching, and fading.

Black Oxide Coating

Black oxide coating adds a uniform black finish while improving corrosion resistance and reducing light reflection.

Passivation

Passivation cleans and protects stainless steel by removing surface contaminants and improving corrosion resistance.

Laser Engraving/Marking

Laser engraving or marking creates precise, permanent markings or designs on the surface without affecting the part's integrity.

Heat Treatment

Heat treatment processes can increase the strength and hardness of metals, improving their mechanical properties and durability.

As-Machined

Preserves the original machining appearance, ideal for functional prototypes or applications where surface aesthetics are not a priority.

Material Selection for CNC Milling

At Richconn, we specialize in providing premium CNC milling solutions for plastic, metal, and composite components that are customized to meet your unique requirements. Modern equipment is installed in our facility, and a group of skilled individuals run it, bringing a wealth of knowledge to each job. We handle every step of the manufacturing process, from choosing the best materials to performing precise machining. Regardless of complexity, we make sure every component satisfies the highest quality requirements. Our promise is to deliver creative, tailored solutions that surpass your expectations and help your products succeed in cutthroat marketplaces.

Plastic materials

Material	Properties	Applications
ABS	Good impact resistance, toughness, machinability, dimensional stability, easy bonding with adhesives	Prototypes, automotive components, consumer electronics housings, enclosures
PC (Polycarbonate)	High impact resistance, good optical clarity, excellent toughness, thermal resistance	Optical components, safety helmets, medical devices, electronic housings
PMMA	Excellent optical clarity, good weather resistance, moderate strength, easy to machine and polish	Display cases, signs, lenses, light guides, aquariums
PA (Nylon)	High mechanical strength, abrasion resistance, low friction, chemical resistance	Gears, bearings, bushings, wear-resistant components
POM (Delrin)	High stiffness, low friction, excellent dimensional stability, good wear resistance	Precision parts, gears, bearings, rollers, automotive components
PTFE	Exceptional chemical resistance, low friction, high-temperature resistance, non-stick properties	Seals, gaskets, electrical insulation, chemical processing equipment
PVC	Good chemical resistance, high rigidity, flame retardant, easy to machine	Piping, fittings, valves, electrical insulation
PE	High impact resistance, low friction, excellent chemical resistance, good wear resistance	Containers, liners, wear strips, marine applications
PP (Polypropylene)	Good chemical resistance, high fatigue resistance, low density, moisture resistance	Chemical tanks, automotive components, living hinges, medical devices
PEEK	High mechanical strength, excellent chemical resistance, high-temperature performance, good wear resistance	Aerospace components, medical implants, high-performance automotive parts, electrical connectors
PU (Polyurethane)	High flexibility, good impact resistance, abrasion resistance, good mechanical properties	Seals, gaskets, wheels, custom molded components
Teflon (PTFE)	Extremely low friction, excellent chemical resistance, high-temperature stability, non-stick surface	Seals, gaskets, bearings, non-stick coatings

Metal materials

Material	Properties	Applications	Grades
Aluminum	Lightweight, high strength-to-weight ratio, corrosion resistance	Aerospace components, automotive parts, medical devices	6061, 7075, 2024, 5083
Steel	High strength, durability, wear resistance, low cost	Structural components, machinery parts, automotive components	1018, 1045, 4140, 4340
Stainless Steel	Corrosion resistance, high strength, heat resistance, aesthetic appearance	Medical devices, food processing equipment, marine parts	304, 316, 303, 416
Brass	Good machinability, electrical conductivity, corrosion resistance	Fittings, valves, gears, electrical components	C360 (Free-machining), C260 (Cartridge)
Copper	Electrical and thermal conductivity, corrosion resistance, ductility	Electrical components, heat exchangers, plumbing fittings	C101 (Oxygen-free), C110 (Electrolytic Tough Pitch)
Titanium	Strength-to-weight ratio, corrosion resistance, biocompatibility	Aerospace components, medical implants, high-performance automotive parts	Grade 2 (Commercially Pure), Grade 5 (Ti-6Al-4V)
Magnesium	Lightweight, machinability, strength-to-weight ratio, thermal conductivity	Aerospace components, automotive parts, electronic housings	AZ31B, AZ91D
Inconel	High strength, oxidation and corrosion resistance, extreme temperature tolerance	Aerospace engines, gas turbines, chemical processing equipment	Inconel 625, Inconel 718
Tool Steel	Hardness, abrasion resistance, cutting edge retention at elevated temperatures	Cutting tools, dies, molds, wear-resistant parts	D2, A2, O1, M2
Nickel Alloys	Strength and toughness, high-temperature resistance, corrosion resistance	Aerospace components, chemical processing, oil and gas industry	Monel 400, Hastelloy C276
Plastic	Lightweight, corrosion resistance, insulator, flexibility	Packaging, consumer goods, automotive interiors	ABS, Polycarbonate, PVC, Nylon
Carbon Fiber	Strength-to-weight ratio, stiffness, low thermal expansion	Aerospace components, sporting goods, automotive parts	Standard Modulus, Intermediate Modulus, High Modulus
Glass	Transparency, hardness, chemical resistance, thermal insulation	Windows, optical components, laboratory equipment	Borosilicate, Soda-lime, Fused Silica
Ceramic	Hardness, wear resistance, thermal stability, electrical insulation	Cutting tools, medical implants, heat shields	Alumina, Zirconia, Silicon Carbide, Silicon Nitride
Rubber	Elasticity, impact resistance, weather resistance, electrical insulation	Seals, gaskets, tires, vibration dampening	Natural Rubber, EPDM, Neoprene, Silicone Rubber
Composite	High strength, lightweight, customizable properties	Aerospace components, automotive parts, sporting goods	Fiberglass, CFRP, Kevlar
Lead	Density, radiation shielding, corrosion resistance, malleability	Radiation shielding, batteries, weights	Pure Lead, Lead-Tin Alloy, Lead-Antimony Alloy
Bronze	Corrosion resistance, wear resistance, machinability, appearance	Bearings, bushings, sculptures, marine hardware	C932 (Bearing Bronze), C954 (Aluminum Bronze), C903 (Tin Bronze)
Tungsten	High melting point, hardness, density, thermal conductivity	Cutting tools, electrical contacts, filaments	Pure Tungsten, Tungsten Carbide, Tungsten Copper Alloy
Zinc	Corrosion resistance, casting properties, low melting point, conductivity	Galvanizing, die casting, batteries, construction materials	Zamak, Zinc-Aluminum Alloy, Pure Zinc

What is CNC Milling?

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CNC milling is a manufacturing process that uses computer-controlled machine tools to remove material from a workpiece to create precise shapes and features. This process involves mounting the raw material on a worktable and using rotary cutting tools that move along multiple axes to cut and shape the material. CNC milling is highly versatile and can produce complex geometries with high precision. It’s commonly used for manufacturing parts in industries like aerospace, automotive, electronics, and medical devices. The ability to program the machine’s movements through software allows for repeatability and efficiency in production runs, making CNC milling a cornerstone in modern manufacturing.

How does a CNC milling machine work?

CNC milling is a process that involves precision and programmed control. It can be broken down into four basic steps:

Step 1: Design the CAD model Engineers use design software such as Autodesk Fusion 360 to create a 3D CAD model of a specific part.

Step 2: Generate instructions for the CNC machine The CAD model is imported into CAM (computer-aided manufacturing) software. Once this step is completed, the software generates a series of digital instructions, known as G-code. These codes instruct the CNC machine on how, where, and how fast it needs to move to create the designed part.

Step 3: Prepare the CNC mill Before you start milling, you need to secure the raw material to the milling machine’s table and use measuring tools or a touch probe to ensure it is positioned correctly. Then, you install the appropriate tool for the material and make all the necessary settings for the machine.

Step 4: Perform the milling operation Once the program is loaded and started, the milling machine’s cutting tool begins to spin at a set speed, gradually removing material to form the final part. The entire process is done automatically, ensuring the parts are accurate and repeatable.

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CNC milling, as a widely adopted manufacturing process, offers numerous advantages and some disadvantages, which are important to consider depending on the application:

Advantages of CNC milling

Precision and consistency: CNC milling offers extremely high precision and repeatability, which is essential for demanding industries such as aerospace and medical devices.

Complex shape processing capabilities: Due to its multi-axis operation capabilities, CNC milling machines can produce complex designs and geometries that may be difficult to achieve through traditional manual methods.

Reduced material waste: CNC milling can minimize material waste by precisely controlling the cutting tool and material.

Improved productivity: CNC milling machines can run continuously without frequent human intervention, significantly improving productivity and processing speed.

Flexibility: Designs can be easily changed through software updates and adjustments to G-codes, which makes CNC milling very flexible and adaptable to different production needs.

Disadvantages of CNC milling

High initial investment: The acquisition and installation costs of CNC milling machines and their supporting facilities are high, which may not be economical for small-scale production.

High technical and operational requirements: Operating and maintaining CNC machines requires specialized training and skills, which can increase labor costs.

Maintenance costs and complexity: CNC machine maintenance can be complex and expensive, requiring regular professional inspection and maintenance.

May be overly complex for simple tasks: For simple or low-volume part production, a traditional manual milling machine may be more economical because CNC equipment requires time and resources to set up and run.

CNC milling is a powerful manufacturing technology suitable for applications that require high precision, complex designs, and large-scale production. However, the cost and complexity of this technology also means that it is not suitable for all types of production needs.

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5 axis Machining Applications:

Complex Surfaces: Five-axis machining excels in producing complex surfaces, such as freeform shapes, curved contours, and multi-sided parts. The additional rotational axes allow the cutting tool to approach the workpiece from various angles, resulting in smooth and precise surface finishes.

Multi-Angle Machining: With five-axis machining, manufacturers can machine parts from multiple angles without repositioning the workpiece. This capability is particularly useful for machining features on different sides of a part or accessing hard-to-reach areas, reducing setup time and improving efficiency.

Aerospace Components: The aerospace industry often requires intricate and lightweight components with complex geometries. 5-axis CNC service enables the production of aerospace parts like turbine blades, engine components, wing sections, and fuselage structures with high precision and accuracy.

Medical Implants and Prosthetics: 5-axis cnc service is extensively used in the medical field to manufacture intricate implants and prosthetics. 5-axis cnc service allows for the precise machining of complex geometries and patient-specific designs, ensuring a perfect fit and optimal functionality.

Tooling and Molds: 5-axis CNC machining is employed in the production of molds, dies, and tooling for various industries. China 5-axis cnc machining enables the creation of complex cavities, undercuts, and intricate features, resulting in high-quality and accurate tooling solutions.

4-axis CNC Machining Applications:

Complex Contours: 4-axis CNC machining is ideal for creating complex contours on parts, such as curved surfaces, sculpted shapes, and intricate profiles. It allows the cutting tool to approach the workpiece from different angles, resulting in precise and intricate geometries.

Undercuts: With the rotational movement provided by the fourth axis, 4-axis machining can easily produce undercuts. Undercuts are features or cavities that cannot be accessed directly by a cutting tool in a straight line. Industries like aerospace and automotive often require undercuts for components like molds, turbine blades, and impellers.

Spiral or Helical Features: 4-axis machining is well-suited for creating spiral or helical features, including threads, screw threads, and grooves. The rotational movement enables the cutting tool to produce these features with precision and accuracy.

Prototyping: The versatility and flexibility of 4-axis CNC machining make it an excellent choice for rapid prototyping. China 4-axis CNC machining allows for the efficient production of prototypes with complex shapes and contours, enabling designers and engineers to test and refine their designs before mass production.