CNC Machining Services
Get instant quotes for custom CNC-machined plastic and metal parts.
Precision CNC machining services from prototyping to production, with fast lead times and high-quality results.
- Express service available
- ISO 9001:2015, AS9100D, ISO 13485
- Tolerances down to ±0.0005"
- 80+ engineering-grade metals and plastics
- All uploads are secure and confidential
Custom CNC Machining Services
Tuowei Precision is a leading company in the industry with the best in custom CNC machines and a team of professionals. We provide complete CNC machining services for your special requirements, whether you need a single prototype or mass production.
Our CNC machining services are high quality, precise, cost-effective, and delivered on time. Customer satisfaction is our priority, and communication and transparency are maintained throughout the process.
What is CNC Machining?
CNC machining is a production procedure in which CNC machines automate the production of parts and components at high levels of accuracy. The machines cut, shape, and finish materials to precise specifications through written instructions. Our full guide, What Is CNC Machining and How Does It Work?, explains the process, the main machine types, and when to choose machining over other processes.
It gives shorter production times and consistent results, which makes it ideal for industries that need complex designs and tight tolerances. CNC machining provides high accuracy parts with the lowest human error, so quality and efficiency stay high.
Which CNC Machining Process Is Right for Your Part?
Most custom parts need one of three CNC processes. Milling suits complex shapes, flat surfaces, and tight tolerances. Turning suits cylindrical parts such as shafts, bushings, and pins. Five-axis machining suits parts with complex angles that need several setups on a three-axis machine.
Use the table below as a quick chooser, then read the service page for the process that fits your part. If your part combines features, for example a milled housing with a turned shaft, the processes work together in one order.
| Your part | Best process | Service page |
|---|---|---|
| Complex shapes, pockets, flat surfaces | CNC milling | CNC Milling Services |
| Cylindrical parts: shafts, bushings, pins | CNC turning | CNC Turning Services |
| Complex angles, undercuts, one-setup parts | 5-axis machining | 5-Axis CNC Machining Services |
CNC Machining Services for Custom Parts
At Tuowei, we specialize in delivering CNC machining services for tailor-made parts in different industries. We provide the most precise and quality services to help you obtain the desired specifications of your components.
Our CNC machines are up to date with the latest technology, so they can take even the most complicated designs. Choose the process below that matches your part, or send your drawing and let our engineers recommend one.
Custom CNC milling is a very efficient technique for producing parts that are complex and demand narrow tolerances. Using our state-of-the-art CNC machines, we provide parts that are accurately milled, smoothly finished, and very durable.
We provide CNC milling services for one-off prototypes and large production runs. Read the service page for milling capabilities, tolerances, and materials.
Custom CNC turning is very suitable for parts in shapes that are cylindrical and precise. Our CNC machines provide tight tolerance parts and high-quality parts whether it is high-volume, high-speed production or low-volume production.
We are experts in operating several materials to suit your individual requirements. See our CNC turning services for operations, tolerances, and materials.
5-Axis CNC Machining Services
Five-axis machining cuts complex parts in a single setup, which keeps accuracy high and lead times short. It suits aerospace, medical, and automotive parts with angled features, undercuts, and sculpted surfaces.
See our 5-axis CNC machining services for the difference between 3+2 and simultaneous five-axis machining, and for cost and tolerance guidance.
CNC Machining Materials: Metals and Plastics
CNC machines work with most materials, and the right choice depends on your part’s strength, weight, and cost needs. Our most machined metals each have a dedicated service page with grades, properties, and tolerances.
For metals, see aluminum CNC machining, brass CNC machining, titanium CNC machining, steel CNC machining, and bronze CNC machining. For plastics, we machine engineering plastics such as ABS, POM, nylon, and PEEK.
PEEK is one of the engineering plastics we machine. Our CNC PEEK machining guide covers material and tooling choices, including tools for glass-filled and carbon-filled grades, and our PEEK speeds and feeds guide gives milling, turning, and drilling parameters, with feed and speed calculations, dry machining, and annealing after machining.
CNC Machining Tolerances
The accuracy of CNC machining is exceptionally high with very narrow CNC machining tolerance, resulting in high-quality components with low variation in each project.
| Feature Type | Typical Tolerance |
|---|---|
| General Dimensional Tolerance | ±0.025 mm (±0.001") |
| High Precision Tolerance | ±0.005 mm (±0.0002") |
| Hole Diameter (Drilled) | ±0.05 mm (±0.002") |
| Hole Diameter (Reamed/Bored) | ±0.01 mm (±0.0004") |
| Shaft Diameter (Turned) | ±0.01 mm (±0.0004") |
| Flatness | 0.02 mm per 100 mm |
| Parallelism | ±0.02 mm |
| Perpendicularity | ±0.02 mm |
| Surface Roughness (Ra) | 1.6–3.2 µm (63–125 µin) |
| Positional Tolerance | ±0.01 mm to ±0.02 mm |
| Thread Tolerance (Cut) | 6H / 6g (ISO) or Class 2A/2B (ANSI) |
| Minimum Feature Size | 0.5 mm (0.020") |
| Repeatability | ±0.005 mm (±0.0002") |
CNC Machining Design Guidelines
Use our state-of-the-art CNC machines with design instructions on how to produce efficiently and precisely, following guideline design instructions provided by TUOWEI expert CNC machining designs.
| Feature | Specification / Guideline |
|---|---|
| Radii | Avoid sharp inside corners. |
| Threads & Tapped Holes | Depth: 3× diameter (Φ1.5–5 mm); 4–6× diameter (Φ≥5 mm). |
| Undercuts | Supported: Square, Full radius, Dovetail profiles. |
| Engraving Options | CNC and laser engraving as per requirements. |
| Wall Thickness | Min. 0.8 mm for strength. |
| Draft Angles | Minimum 1–3° for easy part removal. |
| Hole Sizes | Avoid holes < 0.5 mm; consult for tooling. |
Surface Finishing CNC machining
We provide a wide range of CNC machining surface finishes to fulfill your aesthetic, functional, and durability requirements at TUOWEI, which promises the best quality results with every individual part produced.
As-milled finish has the natural texture of CNC machining, and is good where the look is not as important as the use, giving an economical answer with basic surface quality.
Bead blasting provides a non-polished, rough surface to components produced using CNC machines, which works well to enhance surface texture, more grip and eliminate surface flaws and a uniform and professional appearance.
Powder coating provides high-quality, long-lasting finish to parts, attractive and providing greater protection to parts presented through CNC machines, and this quality makes them resistant to weather, chemicals, and abrasions.
Most CNC machining projects use brushing to create a smooth, refined finish to the surface, giving them a modern, polished appearance with increased texture as well as extended durability, a common practice on decorative or functional surfaces.
Parts produced using CNC machines undergo polishing to provide a smooth and shiny surface, which improves the overall appearance, minimizes friction and increases the wear and corrosion resistance of the part.
Black oxide is a finishing that offers corrosion resistance and a dark and smooth surface, which is ideal in the case of parts produced via CNC machining requiring extra durability and a clean and attractive, consistent coating.
| Aluminium Alloy | Description | Finishing Options | Applications |
|---|---|---|---|
| 6061 | Versatile and commonly used for structural applications. | Anodizing, Powder Coating, Polishing | Construction, Aerospace, Automotive |
| 7075 | High strength, ideal for aerospace and military applications. | Anodizing, Powder Coating, Polishing | Aerospace, Military, High-Strength Components |
| 2024 | Known for its high strength and excellent fatigue resistance. | Anodizing, Cladding, Painting | Aerospace, Military, Structural Components |
| 5052 | Good corrosion resistance and formability, used in marine and automotive applications. | Anodizing, Painting, Polishing | Marine, Automotive, Sheet Metal Work |
| 5083 | Exceptional performance in extreme environments, particularly marine applications. | Anodizing, Painting, Polishing | Marine, Chemical, Industrial |
| 6082 | Excellent extrudability, used for architectural and engineering applications. | Anodizing, Powder Coating, Polishing | Architecture, Engineering, Window Frames |
| 7050 | High strength and stress corrosion resistance, often used in aerospace. | Anodizing, Cladding, Painting | Aerospace, High-Stress Components |
| 1100 | Commercially pure aluminum, excellent corrosion resistance and workability. | Anodizing, Painting, Polishing | Chemical Equipment, Food Processing, Heat Exchangers |
| Brass Alloy | Description | Finishing Options | Applications |
|---|---|---|---|
| C260 | Cartridge brass, excellent for cold working. | Plating, Polishing, Lacquering | Ammunition, Heat Exchangers, Plumbing |
| C360 | Free machining brass, used for precision parts. | Plating, Polishing, Lacquering | Precision Machined Parts, Fasteners, Plumbing |
| C353 | High leaded brass, high strength, used in plumbing. | Plating, Polishing, Lacquering | Plumbing, Fasteners, Valve Components |
| C385 | Architectural bronze, applications for its decorative appeal. | Plating, Polishing, Lacquering | Architectural Trim, Ornamental Hardware, Plumbing |
| C272 | Yellow brass, excellent corrosion resistance, used in electrical components. | Plating, Polishing, Lacquering | Electrical Components, Fasteners, Plumbing |
| Copper Alloy | Description | Finishing Options | Applications |
|---|---|---|---|
| C101 | Oxygen-free, high conductivity, used in electrical applications. | Plating, Polishing, Lacquering | Electrical Conductors, Switches, Terminals |
| C110 | Electrolytic tough pitch, highly conductive, used in electrical and plumbing. | Plating, Polishing, Lacquering | Electrical Wiring, Plumbing, Busbars |
| C122 | Phosphorus-deoxidized, used in heat exchangers and radiators. | Plating, Polishing, Lacquering | Heat Exchangers, Radiators, Plumbing |
| C172 | Beryllium copper, high strength, used in aerospace and oil drilling. | Plating, Polishing, Lacquering | Aerospace, Oil Drilling, Springs |
| C194 | High conductivity, used in automotive and electrical applications. | Plating, Polishing, Lacquering | Automotive Connectors, Electrical Connectors, Springs |
| C210 | Low brass, good ductility and strength, used in fasteners and hardware. | Plating, Polishing, Lacquering | Fasteners, Hardware, Musical Instruments |
| C220 | Commercial bronze, used in jewelry and musical instruments. | Plating, Polishing, Lacquering | Jewelry, Musical Instruments, Architectural Hardware |
| C230 | Red brass, used in architectural applications and hardware. | Plating, Polishing, Lacquering | Architectural Applications, Hardware, Plumbing |
| Grade | Description | Finishing Options | Applications |
|---|---|---|---|
| 301 | Excellent machinability, used for making automotive parts bolts, nuts, and screws. | Polishing, Passivation, Bead blasting | Used for making automotive parts, bolts, nuts, and screws. |
| 304 | Most versatile and widely used stainless steel, used in kitchen equipment tanks, piping, and tubing. | Polishing, Brushing, Passivation | Used in kitchen equipment, tanks, piping, and tubing. |
| 304L | Low carbon version of 304, used for chemical containers and transport. | Electropolishing, Passivation, Bead blasting | Used for chemical containers and transport. |
| 316 | Contains molybdenum for increased corrosion resistance, used in marine applications and chemical processing equipment. | Polishing, Passivation, Bead blasting | Used in marine applications and chemical processing equipment. |
| 316L | Low carbon version of 316, used for surgical instruments and marine hardware. | Electropolishing, Passivation, Bead blasting | Used for surgical instruments and marine hardware. |
| 410 | Martensitic grade, used for fasteners and medical instruments. | Hardening, Polishing, Passivation | Used for fasteners and medical instruments. |
| 416 | High machinability, used for gears, shafts, and valves. | Polishing, Passivation, Bead blasting | Used for gears, shafts, and valves. |
| 420 | High hardness, used for surgical instruments and cutlery. | Hardening, Polishing, Passivation | Used for surgical instruments and cutlery. |
| 430 | Ferritic grade, used for automotive trim and dishwashers. | Polishing, Brushing, Passivation | Used for automotive trim and dishwashers. |
| Steel Alloy | Description | Finishing Options | Applications |
|---|---|---|---|
| 4140 | Chromium-molybdenum steel with high toughness and good fatigue strength. | Heat Treating, Anodizing, Powder Coating | Gears, Shafts, High-Stress Components |
| 4340 | Nickel-chromium-molybdenum steel with excellent toughness and strength. | Heat Treating, Anodizing, Powder Coating | Aircraft Landing Gear, Automotive Parts, Heavy Duty Shafts |
| 8620 | Nickel-chromium-molybdenum alloy steel, case hardening steel. | Carburizing, Heat Treating, Plating | Gears, Pins, Automotive Parts |
| 1018 | Low carbon steel, good weldability and machinability. | Painting, Powder Coating, Galvanizing | Structural Applications, Shafts, Spindles |
| 1045 | Medium carbon steel, high strength and impact resistance. | Heat Treating, Plating, Painting | Gears, Shafts, Machinery Parts |
| 4130 | Chromium-molybdenum alloy steel, good strength and toughness. | Heat Treating, Anodizing, Powder Coating | Aircraft Components, Bicycle Frames, Automotive Parts |
| 1210 | Low carbon steel, good formability and weldability. | Galvanizing, Painting, Powder Coating | Automotive Parts, Machinery Components, Structural Steel |
| 17-4 PH | Precipitation-hardening stainless steel, high strength and hardness. | Heat Treating, Anodizing, Passivation | Aerospace Components, High-Strength Applications |
| Titanium Alloy | Description | Finishing Options | Applications |
|---|---|---|---|
| Grade 1 | Commercially pure titanium, excellent corrosion resistance and formability. | Anodizing, Polishing, Sandblasting | Chemical Processing, Marine, Medical |
| Grade 2 | Commercially pure titanium, balance of strength and ductility. | Anodizing, Polishing, Sandblasting | Aerospace, Medical, Marine |
| Grade 5 (Ti-6Al-4V) | Most commonly used titanium alloy, high strength and light weight. | Anodizing, Polishing, Heat Treating | Aerospace, Medical Implants, Marine |
| Grade 9 | Titanium alloy with good weldability and cold formability. | Anodizing, Polishing, Sandblasting | Aerospace, Chemical Processing, Marine |
| Grade 23 (Ti-6Al-4V ELI) | Extra-low interstitial variant of Grade 5, high strength and toughness. | Anodizing, Polishing, Heat Treating | Medical Implants, Aerospace, Marine |
| Grade 7 | Commercially pure titanium with excellent corrosion resistance. | Anodizing, Polishing, Sandblasting | Chemical Processing, Marine, Medical |
| Grade 12 | Titanium alloy with excellent corrosion resistance and strength. | Anodizing, Polishing, Heat Treating | Chemical Processing, Marine, Aerospace |
| Plastic Material | Description | Finishing Options | Applications |
|---|---|---|---|
| ABS | Acrylonitrile Butadiene Styrene, good impact resistance and toughness. | Painting, Plating, Sanding | Automotive Parts, Consumer Products, Enclosures |
| PC | Polycarbonate, high impact resistance and transparency. | Polishing, Sandblasting, Painting | Optical Discs, Safety Equipment, Automotive Parts |
| PMMA | Polymethyl Methacrylate (Acrylic), excellent optical clarity and weather resistance. | Polishing, Sanding, Painting | Displays, Lenses, Lighting Fixtures |
| POM | Polyoxymethylene (Delrin/Acetal), high stiffness and low friction. | Machining, Sanding, Polishing | Gears, Bearings, Medical Devices |
| PEEK | Polyetheretherketone, high temperature and chemical resistance. | Machining, Sanding, Polishing | Aerospace, Medical Implants, Semiconductor Parts |
| PP | Polyphenylene , high mechanical and thermal properties. | Machining, Sanding, Polishing | Automotive, Electrical Components, Industrial Applications |
| PA66 | Polyamide (Nylon 66), high mechanical strength and rigidity. | Machining, Sanding, Polishing | Mechanical Parts, Automotive, Electrical Insulation |
| PEI | Polyetherimide (Ultem), high strength and excellent electrical properties. | Machining, Sanding, Polishing | Aerospace, Medical Devices, Electrical Components |
| SAN | Styrene Acrylonitrile, good chemical resistance and transparency. | Machining, Sanding, Polishing | Housewares, Cosmetic Containers, Automotive Parts |
| HIPE | High Impact Polystyrene, good impact resistance and machinability. | Machining, Sanding, Painting | Packaging, Consumer Products, Electrical Insulation |
| HIPD | High Impact Polypropylene, high impact resistance and low density. | Machining, Sanding, Painting | Automotive Parts, Industrial Applications, Consumer Goods |
| Fiber-Reinforced Materials | Composite materials with enhanced mechanical properties. | Machining, Sanding, Painting | Aerospace, Automotive, Sporting Goods |
How Much Does CNC Machining Cost?
CNC machining cost depends on material cost, machine time, and part complexity. Milling machines and lathes run at different hourly rates, so geometry and tolerance drive the quote. A drawing-based quote gives your exact price.
Cost per unit falls with volume, because setup and programming are spread across more parts. Tight tolerances, hard materials, and extra finishing add cost, while simpler geometry, standard materials, and larger batches bring it down.
How to Order CNC Machined Parts
Ordering takes five steps. First, upload your CAD files and drawings through the quote form. Second, we review the design for manufacturability and confirm material, tolerance, and finish. Independent guides to ordering CNC parts online, such as PartsBadger’s ordering guide and All3DP’s roundup of instant-quote services, describe the same upload-and-quote flow.
Third, you receive a quote with price and lead time. Fourth, production starts after your approval, with inspection during and after machining. Fifth, parts ship with inspection reports on request.
Gallery of Excellence
Explore the superior design and excellence of components made in Tuowei by the state of the art CNC machines.
Our products are of superior quality and we offer precision-engineered components in a cutting-edge CNC machine and a skilled workforce. We trust in transforming your ideas into dependable and high performance parts every time.
Why Choose Tuowei?
We ensure that at Tuowei, our quality parts are of high quality because of the close inspection and the most recent CNC machining, whereby each part will be of your specifications with excellent consistency and finish.
We have a lean process and the latest CNC equipment that enables us to produce personalized parts with faster speeds without affecting their quality and thus your project will be on time and your deadlines will never be missed.
Take advantage of our skilled engineering staff to design to production with the best CNC machining plans, manufacturability, low costs, and performance of any project.
Partner with Tuowei Precision to Shape Your Vision
From rapid prototypes to scalable production, Tuowei Precision delivers reliable CNC machining with accuracy and consistency at every step. Start your project today.
- Established engineering skills.
- Global project support
- Advanced CNC solutions
- Co-creation of products.
- Expandable capacity of production.
- All uploads are secure and confidential
Tuowei Precision's Solutions
Whether you’re creating a small batch of custom parts or scaling up for high-volume production, Tuowei Precision services offer the flexibility you need.
CNC rapid prototype machining is perfect for creating engineering or production prototypes that closely resemble the final product in both appearance and functionality. At Tuowei, we offer instant quotes and fast delivery, providing you with precise, high-quality CNC machined prototypes for your needs.
- Lead Time: 1-5 business days
- Capability: 1-100 pcs
- Get 20% off the price
Low volume CNC machining often acts as a bridge between prototyping and mass production for new and emerging production. With Tuowei, this process becomes easier, more efficient, and cost-effective, allowing you to scale production quickly while maintaining high-quality standards.
- Lead Time: 5-15 business days
- Capability: 101-10,000 pcs
- Meet tight specifications
CNC production machining is the best solution for producing a thousand parts or more efficiently. Leveraging a diverse selection of materials and automation and multi-axis capabilities, Tuowei delivers high-volume production with tight tolerances, superior dimensional accuracy, high reliability and fast turnaround times.
- Lead Time: 2-4 weeks
- Capability: Above 10,001 pcs
- Consistent Quality
Explore Insights & Innovation
Keep updated on the real CNC machining, industry trends, and production insights in Tuowei Precision, but is installed to enable you to make better production decisions.
Frequently Asked Questions
CNC Machining
What is CNC Machining?
CNC machining is a production process using computer-controlled machines to make components with great precision.
Based on pre-programmed instructions, machines cut, drill, and shape the workpiece.
The result is consistent, precise parts across a range of materials.
What are the advantages and disadvantages of CNC machining?
CNC machining delivers highly precise and repeatable parts, including complex geometries, at both small and large scale, so speed plus repeatability makes it ideal for prototypes and production alike. The negatives are setup and programming cost, which makes one-off simple parts relatively expensive, and the need for skilled programming — simple shapes can be cheaper by another process.
Which materials are compatible with CNC machining?
CNC machines work with most materials: aluminum, steel, titanium, plastics, wood, and composites.
This versatility spans industries from automotive to aerospace.
Material choice is matched to your part’s strength, weight, and cost needs, and our material pages cover aluminum, brass, titanium, steel, and bronze.
How accurate is CNC machining?
CNC machining provides extraordinary precision, typically within ±0.001 inch or less.
Achievable tolerance depends on the machine and the material.
Processes are designed so every component stays within required dimensions and quality.
See the tolerances table above for typical values by feature.
What do I need to do to begin CNC machining my project?
Start with comprehensive design files, such as CAD drawings specifying your part's dimensions.
CNC machines use these files to produce the component accurately.
Then contract a CNC service provider for quotes, scheduling, and support throughout the project.
How much does CNC machining cost?
CNC machining cost depends on material cost, machine time, and part complexity.
Milling machines and lathes run at different hourly rates, so geometry and tolerance drive the quote.
Cost per unit falls with volume, and a drawing-based quote gives your exact price.
See the cost section above for the drivers that move your quote up or down.
Can I order CNC machining services online?
Yes, you can order custom CNC machining services online by uploading your CAD files.
Precision tolerances and material options are confirmed before production begins.
Prototypes and production parts ship with inspection reports on request.
What certifications does Tuowei hold for CNC machining?
Tuowei lists ISO 9001:2015, AS9100D, and ISO 13485 for its machining services.
Is investment casting cheaper than CNC machining?
It depends on volume and complexity. Investment casting spreads its mold cost across many parts, so it can be cheaper at high volumes for complex shapes, but mold tooling is expensive and slow to make. CNC machining is usually cheaper at low volumes, for tight tolerances, and when you need parts fast, because there is no mold to build. Casting suits shapes that are hard to machine; CNC suits parts that need tight dimensions.
Will CNC machining be replaced by AI?
No. AI already helps with programming, toolpath optimization, and inspection, but it does not replace machining itself — parts still need machines, cutting tools, and skilled engineers to set up and check the work. CNC machining stays the practical route for precise metal and plastic parts.
How machinable is PEEK?
PEEK machines well with sharp tools and the right speeds and feeds, but it needs care: heat buildup and internal stress can distort a part, so parts are often annealed after machining. PEEK can also be machined dry. Our PEEK machining guide and speeds and feeds guide cover tooling and parameters, including glass-filled grades.