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What is 4-axis CNC milling
4-axis CNC milling is an advanced machining technology that adds a rotary axis, often referred to as the A-axis, to the traditional three linear axes of X, Y, and Z. The A-axis is a rotary axis that allows the machine to rotate the workpiece to achieve more complex cuts and contours. This additional axis allows the machine to rotate the workpiece during machining, allowing for more complex cuts and contours, increasing the precision and flexibility of the manufacturing process.4-axis CNC milling produces higher quality parts that meet tighter tolerances, and is suitable for use in areas such as aerospace, automotive and the medical industry.
4-Axis CNC Application Areas
- Aerospace industry: for the manufacture of complex aerospace components such as turbine blades and structural parts.
- Automotive: For machining precision automotive components, including engine parts, transmission components and custom exhaust systems.
- Prototyping: makes rapid prototyping and production of complex designs easier.
- Medical industry: for the production of medical devices such as prostheses, surgical instruments and dental implants
Advantages of 4-axis machining
Higher Accuracy
Four-axis CNC machines provide multiple faces, eliminating the need to transfer workpieces from fixtures for precise functionality. This accuracy reduces waste while increasing profitability.
Realizing Complexity in Part Design
The most common reason for using 4-axis machining centers is to manufacture complex parts and components. 4-axis machines are built for full functionality, allowing special angles to be achieved without having to design complex fixtures.
Faster production times
4-axis machining centers reduce cycle times because the machine performs collective processes in a single setup. 4-axis machining centers turn parts in a fixture without stopping the machine, which means there is no need to stop the machine to change tools or have the operator manually rotate parts.
4-axis CNC milling services for customized parts
SCZY LTD delivers precision-engineered components with our advanced 4-axis CNC milling technology, offering unparalleled flexibility for machining complex geometries in a single setup. Our fourth-axis rotary capability enables multi-angle machining of intricate features while maintaining ultra-tight tolerances under ±0.0005″. With expertise in processing over 20 specialized materials and a commitment to reliable on-time delivery, we provide cost-effective manufacturing solutions for prototypes and production runs alike – backed by our team of skilled engineers who ensure every part meets your exact specifications.
CNC Machining Parts Gallery
Large or small workpieces with machinable lengths and widths of 1–2000 mm. SCZY LTD can also provide surface treatment and assembly services upon request.
4-Axis CNC Machining Surface Treatment
We offer a one-stop, high-quality surface treatment solution that covers a wide range of processes, including sandblasting, anodizing, electroplating, electrophoretic coating, baking, chemical conversion coating, passivation, polishing, blackening, and QBQ protection, to precisely meet the stringent requirements of different industries. Each processing technique is accompanied by professional testing services. We provide detailed film thickness data, hardness test reports, precise color parameters, corrosion-resistant salt spray test results, and authoritative adhesion test reports. These scientific data ensure processing quality, endowing your products with exceptional protective performance and aesthetic appeal, while comprehensively guaranteeing reliability and stability.
Standard (As-Machined)
This finish refers to parts just after the machining process, sometimes followed by minor grinding. It contains tool marks, small burrs & chips, but provides tight tolerances. The roughness can be as low as 3.2 μm. This finish is suitable when aesthetics is not a requirement.
Bead Blasting
Bead blasting strikes the tiny glass, ceramic, or other beads on the machined surface at high pressure to remove tool marks, burrs, chips, and other surface irregularities. It produces a light and smoothie texture with an attractive appearance.
Anodized (Type II Or Type III)
The CNC-machined aluminum or non-ferrous parts can be anodized, which refers to adding and protective oxide layer on their surface. Type II is clear and color anodizing, whereas type III (MIL-A-8625/MIL-PRF-8625) refers to hard coating. Anodized surfaces resist harsh environments and save the parts from corrosion, wear, and surface degradation.
Powder coating
It is the electrostatic deposition of a thin powder layer(powder of epoxy, polyester, etc) and curing at high temperature, up to 400. Powder coat surfaces are highly corrosion-resistant and can be achieved in any color. It is applicable to all material-type machine parts with complex geometries.
Polishing
Polishing can be applied through electrochemical and mechanical methods. It produces a smooth and fine, mirror-like finish with Ra as low as 0.3 μm. This surface finish is preferred for machined parts if low-surface friction is essential for performance or aesthetics is important.
Black-Oxide
Black oxide is a surface treatment for ferrous materials that creates a sleek black appearance and offers mild corrosion resistance. It chemically converts the metal surface into an oxide layer, preserving tight tolerances. This finish is ideal for precision components where a low-reflective, durable surface is desired.
4-Axis CNC Machining Materials
SCZY LTD utilizes advanced five-axis CNC technology to specialize in the machining of metals such as aluminum alloy, brass, and titanium alloy, as well as engineering plastics like ABS and POM. Our customization services offer precision and reliability with a tolerance of ±0.01mm, providing precision parts for industries including aerospace, medical, and automation. Five-axis interpolation enables complex surfaces to be formed in a single operation, reducing setup times and achieving surface finish as fine as Ra ≤ 0.8 μm. From prototyping to small-to-medium-volume production, comprehensive quality control throughout the entire process ensures efficient and reliable delivery.
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Aluminum $High machinability and ductility, good strength-to-weight ratio. Aluminum alloys have good strength-to-weight ratio, high thermal and electrical conductivity, low density and natural corrosion resistance. Can be anodized.
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Stainless steel $$$High tensile strength, corrosion and temperature resistant. Stainless steel alloys have high strength, ductility, wear and corrosion resistance. They can be easily welded, machined and polished.
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Mild steel $High machinability and weldability, high stiffness. Mild steels are low-carbon metal alloys offering good mechanical properties, machinability and weldability at low cost. Can be carburized to increased hardness.
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Copper $$$Excellent thermal and electrical conductivity Copper offers excellent thermal and electrical conductivity, it's often used for busbars, wire connectors, and other electrical applications. Copper has a glossy reddish-orange appearance.
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Titanium $$$Excellent strength to weight ratio, used in aerospace, automotive and medical industries. Titanium is a metal with excellent strength-to-weight ratio, low thermal expansion and high corrosion resistance that is sterilizable and biocompatible.
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Tool steel $$$Tool steel has high hardness and can maintain high hardness and red hardness at high temperatures, as well as high wear resistance and appropriate toughness. Tool steel is generally divided into carbon tool steel, alloy tool steel and high-speed tool steel.
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Superalloy $$$Superalloys have excellent high-temperature strength, good oxidation resistance and hot corrosion resistance, good fatigue properties, fracture toughness and other comprehensive properties, and are mainly used in the aerospace and energy fields.
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Brass $$$Brass has strong wear resistance, high strength and hardness, and strong resistance to chemical corrosion. Brass is often used to make wear-resistant parts such as valves and watch movements.
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Alloy steel $$Alloy steel has special properties such as high strength, high toughness, wear resistance, corrosion resistance, low temperature resistance, high temperature resistance, and magnetism.
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Plastics $Engineering plastics have excellent comprehensive properties, such as high rigidity, low creep, high mechanical strength, good heat resistance, and good electrical insulation. They can be used in harsh chemical and physical environments for a long time and can replace metals as engineering structural materials.
Xavier integrated production capacity
A wealth of manufacturing processes and experienced capabilities to meet your production needs help streamline your supply chain and enable “one-stop” ordering for your entire project.
5-axis machining
CNC Milling
Horizontal CNC Milling Machine
CNC turning
Die Casting
Aluminum Casting
Silicone Casting
Forging
Swiss Turning
CNC Milling and Turning
prototype design
gear processing
knurled
Heat Treatment
Masking & Hole Plugging
Grinding
CNC Milling and Turning
5-axis processing
quality control
Surface Finishing
Extensive Industry Experience
SCZY LTD is an experienced custom machined parts manufacturer that produces parts to serve companies in 20+ countries around the world in the areas of microlight infrared, photoelectric rangefinders, aircraft seats, avionics, high-speed rail communications, new energy vehicles, oil & gas electronic valve bodies, pneumatic & hydraulic solenoid valves, high-speed turbine blowers, turbine water pumps, medical testing equipment, semiconductor and automation manufacturing, smart agriculture, and smart home appliances, Smart Wearable. According to the technical characteristics of parts processing in different industries, we are divided into 5 manufacturing divisions, namely Optics, Fluid Control, Transportation, Intelligent Manufacturing, and 5G Life, to match your needs with professional technology and production services, and to customize the best manufacturing solutions according to your needs.
Automotive
Robotics
Energy
Medical Equipment
Optical Lens
Aerospace
4-Axis CNC Machining FAQ's
Browse our 4-axis CNC milling FAQs to learn more about our 4-axis CNC machining services and how we can support your manufacturing needs.
The accuracy of 5-axis CNC machining typically ranges from ±0.01mm to ±0.005mm (5–10 microns), depending on the machine’s precision, material, and part complexity. High-end systems can achieve tighter tolerances of ±0.002mm for critical applications like aerospace components or medical implants. This precision is enabled by dynamic multi-axis control, high-resolution encoders, and post-machining verification (e.g., 3D scanning), making it ideal for complex parts requiring micron-level accuracy.
The main disadvantages of 5-axis machining include higher initial costs for specialized equipment and CAD/CAM software, complex programming requiring advanced expertise to avoid collisions, and increased maintenance needs for rotary axes and precision components. It also demands a steeper learning curve for operators and may face challenges with hard materials requiring expensive tooling, making it less cost-effective for simple parts or small-batch production compared to 3-axis machining.
The minimum wall thickness for CNC machining varies significantly based on multiple factors. For soft metals like aluminum, it can typically be as low as 0.5mm, while harder materials such as stainless steel or titanium usually require a minimum of 1mm to prevent tool breakage and maintain structural integrity during machining. Engineering plastics like ABS or POM allow for thinner walls, often reaching 0.3mm. However, complex geometries, deeper cavities, and the specific capabilities of the CNC machine, especially 5-axis machines that can optimize cutting angles, also play crucial roles. Advanced 5-axis CNC setups may enable even thinner walls down to 0.3mm by reducing tool deflection, but this requires precise programming and careful material selection.
The tightest tolerance achievable in CNC machining is ±0.001mm (1 micron), reserved for ultra-precision applications like aerospace turbine components, micro medical devices, or optical mounts. This requires specialized equipment (e.g., thermally stabilized 5-axis machines), diamond-tipped tools for non-ferrous materials, and controlled environmental conditions. Most industrial CNC machining typically holds tolerances between ±0.01mm to ±0.005mm, with precision depending on material, machine calibration, and part complexity.
Delivery times vary depending on the complexity and scale of the order. For standard five-axis CNC machining, parts can be delivered in as little as 2-3 days, while more complex projects may take up to 2 weeks.
The cost of five-axis CNC machining services depends on a variety of factors, including materials, complexity, and production volume. Please contact us for an instant quote tailored to your specific project needs.
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