Aluminum CNC Machining Service
Prototype to production, backed by extrusion, CNC machining, anodizing, and secondary fabrication.
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Accepted files: STEP | IGS | PDF | DWG
20+ Years
OEM Projects
Extrusion + CNC + Finishing
Drawing Review
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3/4/5-Axis CNC Machining
Why Buyers Choose Zheng Ji
More than a CNC shop: a one-stop aluminum manufacturing partner. With precise dimensional control and custom processing capabilities, we manufacture aluminum parts to meet exact project requirements.
Aluminum Expertise
One Supplier, Fewer Handoffs
Engineering Support
Prototype to Production
Aluminum CNC Machining Capabilities
We offer aluminum CNC machining services for a wide range of custom part requirements.
Aluminum Milling
Removing a portion of material from an aluminium billet or profile using a high-speed rotating blade.
Aluminum Turning
An excellent choice for creating high-precision columnar structures or chamfers.
Aluminum Drilling
For clean, repeatable hole-making used in assemblies and fastener connections.
Aluminum Punching
For rapid, repeatable hole structures on suitable aluminum parts and profiles.
Threading
For internal and external threads that make final assembly faster and more reliable.
Force heated aluminium billets through a shaped die to create continuous profiles with uniform cross-sections. Learn more→
A dense protective layer is formed on the surface of the aluminium component, available in a variety of colors. Learn more→
By spraying colored powder onto aluminium surfaces and curing, appearance and wear resistance improve.Learn more→
Custom CNC Machining Aluminum Parts
Zheng Ji manufactures precision aluminum products for industrial, commercial, and OEM applications. From enclosures to heat sink parts and structure components for automotive applications, we machine aluminum products built for performance, consistency, and production efficiency. Our CNC machining capabilities support both standalone machined parts and secondary machining for extruded aluminum profiles.
Enclosure
Precision-machined aluminum enclosures for electronic devices, control systems, instruments, and industrial assemblies.
Heat Sink
Custom aluminum heat sinks designed for efficient thermal dissipation, dimensional accuracy, and high-quality finish.
Automotive Part
Machined aluminum housings for automotive control units, sensors, and electronic modules requiring protection, heat dissipation, and precise fit.
Lighting Housing
Aluminum housings and profile-based components for LED lighting systems, combining structural precision with thermal performance.
Battery Tray End Plate
High-precision aluminum end plates and support components for EV battery tray assemblies, built for lightweight strength and assembly accuracy.
Robotics Component
Machined aluminum brackets and structural connection parts for robotics, automation systems, and modular equipment assemblies.
Common Aluminum Grades for CNC Machining
Aluminum 6061
Al–Mg–Si
6061 aluminum is one of the most versatile alloys used in CNC machining. It offers an excellent balance of strength, machinability, and corrosion resistance. In CNC machining, 6061 is ideal for structural components, brackets, and housings that require both precision and moderate strength
Aluminum 6063
Al–Mg–Si
6063 aluminum is known for its superior surface quality and excellent extrudability. It is softer and more ductile than 6061, making it a preferred material for aluminum extrusion profiles with complex cross-sections and decorative applications.
Aluminum 6082
Al–Mg–Si
6082 aluminum is a high-strength alloy commonly used in Europe as an alternative to 6061. It offers better mechanical strength and improved resistance to stress corrosion cracking, while maintaining good machinability. In CNC machining, 6082 is favored for precision mechanical parts and load-bearing structures.
Aluminum 7075
Al–Zn–Mg–Cu
7075 aluminum is a high-strength aerospace-grade alloy with exceptional hardness and fatigue resistance. It is widely used in CNC machining of precision components that require maximum strength-to-weight ratio, such as aerospace fittings, molds, and high-performance mechanical parts.
Related CNC Machining Projects
About Zheng Ji Aluminum
Zheng Ji is a leading global manufacturer of aluminum products, dedicated to providing professional aluminum processing services. Our factory is equipped with advanced CNC machining equipment specifically designed for processing aluminum products of various shapes. Our production lines cover extrusion, CNC machining, surface treatment, welding, and sheet metal fabrication. No matter the shape of your aluminum product, we can offer you professional and effective solutions.
Dimensional Tolerance Management in Aluminum CNC Machining
Unless we have agreed to other tolserances in your Quote, we will work to achieve and hold the tolerances noted below, which will vary per the primary manufacturing method you select. (eg.:Round hole 10mm, tolerance +0.01—0.03mm)
| Part Length | Orientation and Form Tolerance | Angularity Tolerance |
| 0 to 12″(300 mm) | +/- 0.005″ (0.125 mm) | Angularity +/ ½ degree |
| 12″ to 24″(600 mm) | +/- 0.010″(0.250 mm) | Angularity +/ ½ degree |
| 24″-36“(900 mm) | +/1/64″(0.016″)(0.400 mm) | Angularity +/-1degree |
| 36“ – 60“(1500 mm) | +/- 1/32″ (0.031″) | Angularity +/-1 degree |
| Over 60″ | +/1/6″ (0.063″) | Angularity +/-1 degree |
Size limitations for CNC Machining Part
| Item | Part size/dimension |
| Maximal part size | 1300 mm (50 in) |
| Minimal part size | 2 mm (0.08 in) |
| Minimal diameter | 0.3 mm (0.01 in) |
You need to pay attention to dimensional accuracy control during the product design stage to ensure smooth assembly. Please contact us for any precision control inquiries
Design Guidelines for Aluminum CNC Machining
Optimize your designs to avoid unnecessary machining features, limit part complexity, help reduce CNC machining costs and time, and create machined parts faster and more efficiently.
Avoid right angles
Avoid right angle designs in recessed areas. CNC milling and turning usually use cylindrical tools, which cannot cut a perfect right angle and usually leave a small radius. Therefore, during milling, the corners of the concave areas are all rounded.
Avoid overly deep cavities, grooves and holes
The depth of the cavity and groove is usually related to the diameter of the tool used to make the internal fillets. Keep the cavity depth 3 – 4 times the tool diameter or the groove depth less than 4 times the feature width. Blind holes or Through holes(Suggestion):
- Standard-size holes: can be machined quickly and with high precision
- Maximum depth: 4 times the diameter
- Minimum hole diameter: 1 mm
Using an end mill will increase costs for non-standard holes.
Avoid thin walls
Vibration increases when machining thin features. The minimum thickness of thin-walled aluminum parts should be 0.5-0.8 mm. If the walls are for supporting action or taller features, the thickness should be increased to avoid vibrations during CNC machining
Avoid small or raised logo
Adding text in the custom CNC machining is time-consuming to process.
electrochemical etching or laser marking is usually better. If you must cut text, choose recessed rather than raised text whenever possible, with a font depth of no more than 0.3mm.
Stick to the standards for threads
Sticking to standard sizes is important when creating threads.
- Length: a maximum of 3 times the nominal diameter of a hole.
For blind hole tapping, it is preferable to add a length of at least 1/2 hole diameter at the root of the hole. You could think about using inserts. threaded coils provide longer service life than bare threads, especially in soft materials such as aluminum, and are easy to install.
Our initial order encountered some issues with design and tolerances, but their engineering team responded quickly and provided a practical CNC machining solution. The final aluminum parts met specifications perfectly!! What I appreciated most was their ability to handle all processes independently—extrusion, machining, and anodizing—making the entire process smooth and reliable. Suppliers as responsive and capable as them are rare.
—Pierre Dubois, France
How to Work With Us
Realize your ideas and get custom CNC machining in a few simple steps
01
Upload CAD or 3D file
02
DMF Analysis and Get a Quote
03
Order Confirmation
04
Parts Shipped
Get a digital quote within hours. Get real-time pricing and design feedback, and our team of experienced engineers are on hand to help you with any design adjustments.
Put Your Parts into Production Today
Scale your production with Zheng Ji’s vast network. Enjoy various manufacturing processes, flexible order volumes, and expert engineers. From prototyping to custom part production, we deliver quality at a reasonable price.
Over the past 20 years, we’ve earned multiple ISO certifications demonstrating our quality capabilities. We guarantee timely and reliable prototyping and production services.
- Factory park covering an area of 70,000 square meters
- Timely and affordable pricing solutions
- Comprehensive processing options
- Customized delivery timelines
Frequently Asked Questions
We offer CNC machining services: milling, turning, drilling, threading, punching, custom surface finishing. Whether it is CNC aluminum prototype or mass customization, we can meet your needs.
There are more than 60 skilled employees and 30 high-performance CNC machines in our CNC machining center, maintaining 24/7 operations. The precision of CNC machining can be controlled within 0.1mm.
Yes, we own 12 aluminum extrusion lines. Your products can be extruded and CNC machined at Zheng Ji factory. Completing product extrusion, CNC machining, surface treatment, and shipping as finished products has always been our strength.
Make samples according to the drawings, wait for the samples to pass the test, and use the sample quality as the inspection standard for mass production.
The right angle in recessed areas.
CNC milling and turning usually use cylindrical tools that have rounded ends. The tool cannot cut a perfect right angle and usually leaves a small radius.
Electro-discharge machining (EDM): EDM can produce very precise internal right angles because it uses electrode discharge to remove material instead of mechanical cutting.
There is no standard MOQ for our aluminum CNC machining services. We can accommodate a range of needs from single cnc aluminum prototypes to small-batch custom work and large-scale production.
Aluminum CNC Blog
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How to Prepare an RFQ for Custom Aluminum CNC Machined Parts
An accurate aluminum CNC quote starts with a controlled technical package. Send aligned files, exact requirements, realistic quantities, and one
CNC Aluminum Enclosure vs Extruded Aluminum Enclosure: How to Choose
A CNC-machined aluminum enclosure gives the designer the most freedom for three-dimensional cavities, local bosses, precision interfaces, and low-volume changes.
Comprehensive services
Aluminum Extrusion
Provide mold design and production to product extrusion, supporting large-scale and complex extrusion production
Surface Treatment
Offer surface treatment services such as anodizing, powder coating and electroplating.
