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Custom Online CNC machining Services
At Lewei, we offer effective CNC machining services, which serve both metal and plastic components. We will ensure accuracy, speed and on-time delivery of your custom parts whether you are working with a single prototype or large scale production.
- ISO 9001:2015, ISO 13485, ISO14001:2015, IATF 16949:2016 certified.
- Be accurate, quick, and deliver on-time on the custom parts.
- Close tolerances and short fuses in order to make your designs come to life.
- Assured quality output with each project.
Upload your CAD files with us and get an immediate quote. Achieve precision and reliability in your project.
CNC Machining Services for Custom Parts
In Lewei Precision, we deal with CNC machining of metal and plastic components. Our CNC machines include more than 700 CNC machines that are used in CNC milling, CNC turning, and CNC routing of prototyped images and large production. Our certification ISO 9001 is a guarantee of close tolerance and timely delivery of all projects.
We have the capability to machine complex parts with precision and speed and we have 3 axis, 4-axis and 5-axis machines. CNC milling services are available with tight tolerances or great surface finishes on metal and plastic parts, whether it is a prototype or a production run, and it is done fast and to the precise specifications.m machined parts, whether simple or complex. With over 700 CNC machines in-house, we offer milling, turning, routing, EDM machining, drilling, and precision grinding services.ject.
CNC turning is ideal in the production of cylindrical components such as pins, bushes, and shafts. We have high-precision turning to tight tolerances of up to ±0.001 inches utilizing high-end 3-axis, 4-axis and 5-axis turning machines. Small-scale prototypes or high volume production, we will provide your industry with high-quality, consistent components in the automotive, medical and aerospace sectors.
A Strong Network of CNC Machine
Lewei Precision operates a dedicated CNC machine shop and partners with a vast network of facilities across China. Our capabilities extend beyond standard CNC machines, with grinders for smooth finishes, wire cutters for precision, and EDM machines for complex shapes. This variety allows us to handle intricate designs and produce CNC-machined parts that meet exact specifications, all while maintaining tolerances as tight as 0.01mm for flawless integration into larger assemblies.
In addition, we utilize automated production lines where machines work together seamlessly, ensuring high-volume production with minimal errors. This efficient system helps keep projects on schedule while delivering consistent results and maintaining the highest quality standards.
CNC Machining Materials
Our CNC machining services support engineering-grade metals and plastics used for precision milled and turned parts.
All materials listed below are supplied in machinable stock suitable for CNC processing.
Lightweight, corrosion-resistant, and highly machinable for precision and structural parts.
Grades
6061
6061-T6
6082
7075
7075-T6
2024
High electrical and thermal conductivity for conductive components.
Grades
C110
C101
Easy to machine with excellent surface finish for precision parts.
Grades
C360
C260
C280
Hard, wear-resistant material for tooling and high-stress components.
Grades
D2
A2
H13
High strength material for load-bearing and mechanical components.
Grades
1018
1020
1045
4140
EN8
EN19
Corrosion-resistant material for industrial, food, and medical components.
Grades
304
304L
316
316L
303
17-4 PH
Ultra-lightweight metal for weight-critical machined components.
Grades
AZ31
AZ91
High strength-to-weight ratio with excellent corrosion resistance.
Grades
Grade 2
Grade 5
Plastics
Impact-resistant plastic for enclosures and functional components.
Grades
ABS Natural
ABS Black
ABS Antistatic
High impact strength for protective and structural components.
Grades
Clear PC
Black PC
Rigid plastic with excellent optical clarity.
Grades
Clear PMMA
Black PMMA
Low friction and high dimensional stability for precision components.
Grades
POM-C
POM-H
Strong and wear-resistant plastic for mechanical parts.
Grades
PA6
PA66
Glass-Filled PA
Very low friction and high wear resistance for sliding components.
Grades
UHMW Natural
High-performance plastic for extreme temperature and chemical conditions.
Grades
Virgin PEEK
Glass-Filled PEEK
Carbon-Filled PEEK
Lightweight and chemical-resistant plastic for non-structural parts.
Grades
PP Homopolymer
CNC Machining Tolerance
| Feature / Condition | Standard Tolerance | Tight Tolerance | Engineer Reality Notes |
|---|---|---|---|
| General Linear Dimensions | ±0.10 mm | ±0.05 mm | Most CNC parts run here without cost explosion |
| Tight Linear Dimensions | ±0.05 mm | ±0.01 mm | Requires stable setup, sharp tools, temperature control |
| Hole Diameter (reamed) | ±0.02 mm | ±0.01 mm | Drilled holes alone won’t hit tight tolerance |
| Hole Position | ±0.05 mm | ±0.02 mm | Fixture accuracy matters more than machine |
| Shaft Diameter | ±0.02 mm | ±0.01 mm | Tool wear directly affects size |
| Flatness | 0.05 mm / 100 mm | 0.02 mm / 100 mm | Material stress relief matters |
| Parallelism | 0.05 mm | 0.02 mm | Multi-setup parts increase risk |
| Perpendicularity | 0.05 mm | 0.02 mm | Requires probing & controlled referencing |
| Surface Finish (Ra) | 3.2 µm | 1.6 µm | Below this = secondary finishing |
| Threaded Features | ISO 6H / 6g | ISO 5H / 5g | Class depends on material & tool condition |
CNC Machining Surface Finishes
Discover high-end surface finishing solutions that improve the functionality, appearance, and longevity of your CNC-machined parts. Simple or high-performance finish, we offer customized solutions to each project.
As-milled finish It exhibits tool marks on the surface and a surface roughness of ~125 µin Ra. As-milled finish is used on functional parts where it is not critical to have a smooth finished part but where strength and longevity are needed.
Bead blasting produces a smooth, matte finish where abrasive media is directed to provide aesthetics of a pleasing surface uniformity and also enhances part integrity and performance.
This is a permanent coating that gives it enormous corrosion, UV, and wear resistance. Powder coating is ideal in those parts that need durable protection without compromising appearance.
By brushing, one attains a satin-like finish, which is done by applying a uniform grain texture. It is a perfect match on non-reflective surfaces and gives a good look as well as offers a smooth surface to the decoration.
Polishing provides a mirror-like smooth finish and enhances aesthetic quality of components. It is the ideal product to be used in a situation when the aesthetics and performance are to be considered simultaneously, which creates a smooth, shiny surface.
During electropolishing, a coated layer of metal is removed enhancing the surface smoothness and corrosion resistance. It improves the quality of parts by creating less friction and consequently is best suited to the parts that need a high level of finishing.
Size & Machine Limitations
At Lewei Precision, we offer precise CNC machining services with the following size and machine limitations:
| Process / Capability | Maximum Dimensions / Limits | Description |
|---|---|---|
| 3-Axis Milling | 700 × 400 × 300 mm | For simple geometries and fast production runs |
| 4-Axis Milling | 600 × 350 × 300 mm | Ideal for parts requiring additional rotation for more complex shapes |
| 5-Axis Milling | 500 × 350 × 300 mm | Perfect for intricate and detailed parts with complex geometries |
| CNC Turning | Ø300 mm diameter × 500 mm length | Used for precision cylindrical components like shafts and bushings |
| Turning with Live Tooling | Ø250 mm diameter | Offers additional milling capabilities on turning machines for complex parts |
| Minimum Wall Thickness – Metals | ≥ 0.8–1.0 mm | Ensures structural integrity |
| Minimum Wall Thickness – Plastics | ≥ 1.2–1.5 mm | Ensures structural integrity |
| Minimum Hole Diameter | ≥ 1 mm | Precise feature size requirement |
Design Guidelines for CNC Machining
Optimize your designs for manufacturability with our expert guidelines. Lewei Precision provides valuable feedback on your custom machined parts to ensure the best results in CNC machining.
| Features | Description |
|---|---|
| Radii | Sharp internal corners form rounded radii. Depth: ≤ 12 times the drill diameter for drills. Depth: ≤ 10 times the tool diameter for end mills. |
| Threads and Tapped Holes | For diameters Φ 1.5–5 mm, depth should be 3 times the diameter. For diameters Φ 5 mm or larger, depth should be 4–6 times the diameter. Threads of any specification and size can be produced as per customer requirements. |
| Undercuts | Achievable with square profiles, full radius, and dovetail profiles through precise machining. |
| Text | CNC Milling: Minimum width of 0.5 mm and depth of 0.1 mm. CNC Turning: Laser marking or CNC engraving/laser engraving available for standard text, per customer specifications. |
Lewei Precision Solutions
Whether you’re creating a small batch of custom parts or scaling up for high-volume production, Lewei Precision services offer the flexibility you need.
Precision CNC Machining with Consistent Quality
At Lewei Precision, precision and quality are the main focus in all the stages of CNC machining. We have a sophisticated inspection system that ensures that every part that is produced is of high industry standards in terms of accuracy and performance (prototype or high volume production).
Dimensional Accuracy
Inspections of all parts are done with CMM (Coordinate Measuring Machines), optical scanners and digital micrometers. This will provide a high level of accuracy at the micron level and your components will be in the exact specifications to ensure they work perfectly.
GD&T & Tolerance Verification
We use ISO 2768-mK and ASME Y14.5 verification measures of GD&T, making sure that there is dimensional and geometric accuracy. Every component is subjected to stringent inspections in order to satisfy the necessary levels of tolerances and quality.
Surface & Finish Testing
Our team will measure surface roughness (Ra) within the range of 3.20-0.8 μm and coating thickness check. This provides the continuity of visual attractiveness as well as upholding the functional integrity of your components.
Traceability/ Documentation.
Each project will contain such important documentation as Material Test Reports (MTRs), First Article Inspection (FAI) report, and CMM data sheet. This gives 100% traceability and transparency of the manufacturing process.
CNC machine process in Lewei Precision.
In Lewei Precision, we have a systematic CNC machining production line, which is efficient and accurate at each production line.
Engineering Review
Our team will review your CAD files thoroughly to determine its viability, possible problems, and that your design meets production criteria.
CAM Programming
After reviewing the design, we code the machining process with sophisticated CAM software to outline tool paths and maximize efficiency.
Multi-Axis Machining
We produce your parts using the best available multi axis CNC machine that is highly precise and complex in nature.
CMM Inspection
Components are carefully examined with Coordinate Measuring Machines (CMM) to ensure dimensional precision and adherence to quality standards.
Lewei Precision CNC Machining Solutions
Our CNC machining services cater to all production needs, from rapid prototyping to large-scale manufacturing, ensuring precision and quality at any volume.
CNC rapid prototyping is perfect for creating accurate prototypes that closely resemble the final product. Get precise, high-quality prototypes delivered fast with instant quotes.
- Lead Time: 1-5 business days
- Capability: 1-100 pcs
- Get 20% off the price
For businesses transitioning from prototypes to mass production, our low-volume CNC machining offers cost-effective, flexible solutions while maintaining high quality.
- Lead Time: 5-15 business days
- Capability: 101-10,000 pcs
- Consistent quality
Scale up with our CNC machining services for high-volume production, offering tight tolerances, fast turnaround times, and reliable results.
- Lead Time: 2-4 weeks
- Capability: Above 10,001 pcs
- Efficient and precise
Advantages
Advantages of CNC Milling
CNC milling provides a range of benefits, ensuring efficient, high-quality production.
- High Accuracy: CNC milling machines offer tight tolerances, ensuring high precision and consistency in every part.
- Complex Design Creation: With multi-axis movement, CNC milling can craft intricate shapes and complex features that are challenging to achieve manually.
- Enhanced Efficiency: Automated processes allow for continuous production, reducing lead times and increasing productivity by minimizing downtime.
- Material Flexibility: CNC milling works with various materials, including metals, plastics, and composites, making it adaptable for numerous applications.
- Consistent Reproduction: Once a design is programmed, the machine can replicate parts with perfect consistency, reducing human error.
- Speed:Though initial setup costs are high, the efficiency and precision of CNC milling reduce overall production costs, particularly for large runs.
Applications
Applications of CNC Milling
CNC milling is widely utilized in various industries to produce high-precision parts and components:
- Engine Parts:Essential for manufacturing engine blocks, cylinder heads, and pistons, ensuring durability and performance in automotive and aerospace sectors.
- Gear Components: Critical for producing gears, splines, and shafts with tight tolerances, widely used in machinery and automotive systems.
- Medical Devices:Used to create highly accurate implants, such as hip joints, dental implants, and surgical screws for the healthcare industry.
- Electronic Enclosures:Produces housings for electronic devices, offering a secure fit and protection for sensitive circuit boards.
- Custom Prototypes: Enables rapid prototyping for design testing and iteration, allowing designers to refine their products before mass production.
- Tooling and Dies: Key for manufacturing molds, dies, and cutting tools that are used in various production processes.
Start Your CNC Machining Project
CNC Machining for Various Industries
At Lewei Precision, CNC machining services are implemented with regards to distinctive needs of industries and provide high-quality and dependable solutions to the projects of all dimensions. We deliver high quality components across a variety of industries regardless of whether you are an individual inventor or a major company.
Success Stories of
Lewei Precision x Rennteam Stuttgart: Innovation Collaboration of Racecar Engineering
Lewei Precision proudly supports Rennteam Stuttgart by manufacturing 2 mainbar components and over 80 Aluminum inserts. Our precision engineering ensures they’re ready to conquer the Formula Student competitions, giving the team a winning edge.
Case Study: LURA’s Partnership with Lewei Precision for Precision Rocket Engine Parts
LURA, the Leeds University Rocket Association, used Lewei Precision’s 5-axis CNC machining and turn-mill compounding techniques to create intricate engine parts essential for their victory in the National Race to Space Propulsion Competition.
Case Study: Andrea Piccino Collaborates with Lewei Precision to Bring the “Iron Man Suit” to Live
Andrea, a dedicated mechanical engineer from Italy, utilized Lewei Precision 5-axis CNC machining to produce a full-body passive exoskeleton that boosts human strength and minimizes physical strain.
Case Study: Lewei Precision Powers Arco Aria’s Tether Car Success
Thanks to Lewei persicion, Arco successfully modified his tether car’s engine, including turning the crankshaft and designing a new intake system for improved efficiency.
Why Choose Us
When you choose us, you get more than just parts but you will get precision, reliability, and a seamless experience. Here’s what makes us the right choice for your CNC machining needs:
Exceptional Precision
Produce perfect components with very tight tolerances down to 0.001 inches, and the most accurate parts in every project.
We highly value time, and that is why we will ensure that our lead times are fast, in some cases less than 1 day to ensure that your project does not run behind schedule.
Our engineering support will be at your disposal to make you maximize your designs and make part performance better in order to achieve the best results.
CNC Machining FAQs
Which CNC machining services does your company offer?
Our CNC machining services (CNC milling, CNC turning, CNC routing, CNC EDM and 3D printing) are used to serve both, simple and complex parts, in a variety of industries.
What level of precision can you achieve?
We have machining abilities and can achieve high tolerance as fine as -.0001 inches as long as the high-performance parts are required.
What kind of material can be used with your CNC machining?
Here we have a wide variety of materials that we work with such as metals (aluminum, steel and titanium), plastics (ABS, Nylon and PEEK), and composite materials, which gives you a wide choice on whatever you need to machine.
What types of surface finishes can be applied to parts?
To add appearance and functionality to your parts, we offer a wide variety of surface finishes, including bead blasting, powder coating, anodizing, polishing and black oxide.
How fast is the lead time for delivery of a prototype?
Our prototyping is done within 1-5 business days and it is delivered in the shortest time possible, meaning you receive quality parts just in a fraction of the time.
Which file formats are compatible with your services?
We do not have a problem with file format as we are able to accept all file formats such as STL, STEP, IGES, and DXF hence you can easily submit your designs to our machine so that they can be machined with ease using CNC machines.
What is your method of ensuring quality and accuracy of parts?
Our quality control is very high and we use the state-of-the-art inspection tools such as CMMs and digital micrometers to guarantee that all parts are accurate and performing to your requirements.
Are there any design restrictions for CNC machining?
Although it is possible to produce very complex parts, some material and machining limitations can be in place. Our highly qualified team will assist you on the design process to make it feasible and cost effective.
Can I provide my own materials?
Yes, we accept clients, who want to bring their own materials. But please, discuss your material selection with us prior to your material being used, so it can be machined.
What would happen to my data in the process?
Securing your data is your number one priority. Your files are safe and private because we have encrypted channels of communication and abide by tough confidentiality measures.
Which industries are you specialized in?
Our CNC machining services are applicable to several industries, such as aerospace, automotive, medical devices, robotics, consumer electronics, and others, with personalized solutions to each of these industries.
How can I obtain a quote for my project?
In order to get a personalized quote, all one needs to do is to upload his or her CAD files to our online platform. The quote will be generated immediately on your project specifications by our system.
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