CNC Machining Services
Our CNC Machining Capabilities and Services:
RpProto, in Xiamen, China, is your most reliable CNC machining services supplier for custom parts. We have hundreds of sets of 3-axis, and 5-axis CNC machines and a turning machines to offer you rapid precision machining, including CNC milling, CNC turning.
RpProto committed to the manufacturing of high-quality, ultra-precision equipment and components. Main products include electromechanical shafts, valve cores and sleeves, automation components, mechanical equipment parts, aerospace, medical and military components, optoelectronic and semiconductor core components, and mold accessories.
Our skilled machinists can make turned and milled parts using a wide range of plastic and metal materials. We manufacture millions of machined plastic and metal parts annually for companies worldwide.
CNC Milling
- High-precision milling with tolerances up to ±0.01mm
- Handling of various materials, including aluminum, steel, brass, plastics, and composites
- Support for intricate designs and complex geometries
CNC Turning
- High-speed turning with precise control over diameters and lengths
- Suitable for materials like metals, plastics, and specialty alloys
- Ability to create symmetrical shapes and threaded components
- Advanced 5-axis machining for parts with complex geometries
- Handling of tight tolerances and challenging angles
- Capable of producing parts in one setup, reducing production time
Custom prototyping services for rapid design iterations, allowing you to test, refine, and validate designs before full production.
- Capabilities:
- Rapid prototyping options with quick turnarounds
- Support for a wide variety of materials to meet specific needs
- Ability to produce functional prototypes with close-to-final part quality
CNC machining services for both low-volume prototypes and high-volume production, scalable to match project demands.
- Capabilities:
- Efficient handling of projects from single prototypes to thousands of parts
- Flexible scaling without compromising on quality or consistency
- Quality checks and controls to ensure consistent results across high volumes
Our CNC Machines
5-Axis CNC Machine
615 X 260 X 1585 X 1574 mm
4-Axis CNC Machine
850 X 550 X 550 mm
3-Axis CNC Machine
762 X 410 X 510 mm
Examples of CNC Machined Parts
Get a Quote for Machining Projects
Upload your project files for a quick quote for your machining parts.
STL | STEP | SLDPRT | IGS | IPT | PRT | SAT files
- All of your files are safe and confidential.
CNC Machining Materials
More than 40 different grades of metal and plastic materials are available at RpProto.
Metal Material
Steel
- Mild Steel (1018, 1045)
- Tool Steel (D2, A2, O1, S7)
- Carbon Steel (4140, 4340)
- Spring Steel
Brass
- Brass C360
- Brass C464 Naval Brass
Bronze
- Phosphor Bronze
- Aluminum Bronze
Stainless Steel
303, 304, 316, 420, 17-4
Delrin (Acetal / POM)
HDPE
POM
PVC (Polyvinyl Chloride)
CNC Machining Surface Finishes
We provide complete surface finishing options for precision machined parts, such as Anodizing， Bead Blasting， Powder Coating， Electroplating， Polishing， and Brushing. Learn More…
Materials: aluminium, magnesium, titanium
Texture: Smooth, matte finish
Thickness: 1.8 μm to 25 μm (0.00007″)
- Type I: Basic type, using chromic acid to produce a thin and ductile anodized layer on an aluminium part
- Type II: Utilizes sulfuric acid to produce a thicker anodized layer on a part, making it for a variety of visual effects
- Type III: Known as “hard anodizing.” It also uses sulfuric acid but produces a thicker anodized layer, which is for surfaces that need to be extra hard.
- Chemical Film / Alodine: Entails coating part with alodine to produce results comparable to anodization.
Bead-blasted parts have a smooth surface with a matte texture.
Materials: ABS, Aluminum, Brass, Stainless Steel, Steel
Texture: Matte
Standards: Sa1, Sa2, Sa2.5, Sa3
Materials: Aluminum, Steel, Stainless Steel
Plate type: Zinc, Nickel, Electroless Nickel
Texture: Smooth, glossy finish
On the surface of parts, powder coating creates a long-lasting, wear-resistant, and corrosion-resistant layer. Powder coating can be used to color items and is suitable for usage on any metal.
Materials: Aluminum, Stainless Steel, Steel
Texture: Gloss or semi-gloss
Materials: ABS, Aluminum, Brass, Stainless Steel, Steel
Texture: satin
Standards: Sa1, Sa2, Sa2.5, Sa3
Get a smooth surface by removing cutting marks or printing marks. It is to prepare your parts for later painting and plating. For various metallic effects, we can provide brushed and satin surfaces and optically clear polishes on transparent acrylics.
Materials: Aluminum, Brass, Stainless Steel, Steel
Texture: Glossy
Types: Mechanical polishing, chemical polishing
Tolerances for CNC Machining
| Dimension | Tolerances |
|---|---|
| 0.5 – 6.00 mm | ± 0.05 mm |
| 6.00 – 30.00 mm | ± 0.10 mm |
| 30.00 – 120.00 mm | ± 0.15 mm |
| 120.00 – 400.00 mm | ± 0.20 mm |
| 400.00 – 1000.00 mm | ± 0.30 mm |
| Angular: ±0.5° | |
| Surface Roughness 3.2μm Ra | |
With drawing: Tolerance quality equivalent to IT7 can be achieved.
Without drawing: ISO 2768 fine
Example of application of tolerances:
Using state-of-the-art Coordinate Measuring Machines (CMMs), laser scanners, and vision systems, we achieve precision measurements down to micrometers, verifying part dimensions, tolerances, and finishes.
Our CNC machining facility is ISO 9001 certified. Each project complies with relevant regulations, such as AS9100 for aerospace components and ISO 13485 for medical devices.
If you’re looking for a machining shop in China, RpProto will be your trusted partner. Our state-of-the-art CNC machines and highly skilled team ensure precision and quality in every project.
- Flexible, Versatile, Easily customized
- Highly accurate with tight tolerances
- Lower cost for fixed tooling and preparation
- Suitable for various materials (aluminium, brass, mild and stainless steels, magnesium and titanium, engineering-grade plastic resins, etc.)
- CNC machined components are full strength and can be used soon after processed
CNC Machining FAQs
CNC (Computer Numerical Control) machining is a subtractive manufacturing method. The feedstock is machined to its final form by subtracting and removing material. Drilling holes, boring lots and pathways and shaping metal stock into new material with varying tapers, diameters, and shapes are all done.
CNC machining can process aluminum, steel, brass, copper, titanium, rigid plastics, etc.
Prices vary depending on the materials, complexity, quantity, and lead time. For a detailed breakdown of each cost driver — including hourly rates by machine type, material cost comparisons, and a step-by-step cost formula — see our guide on key factors that affect CNC machining costs.To obtain an accurate price for your specific part, upload your 3D CAD model.
For all CNC machined parts, we adhere to ISO 2768 standards. We manufacture metal parts following ISO 2768-m (medium) or ISO 2768-f (high) (fine). Plastic-machined parts will adhere to 2768-m (medium). Geometric tolerances down to ± 0004 in. (0.010 mm) are possible but must be indicated in technical drawings.
We use CNC machining to manufacture prototypes and production parts rapidly. It offers high precision, engineering-grade materials, and short lead times.
All machined parts will receive a standard inspection included in the part price and lead time.