Rapid CNC Machining Services

Our CNC Machining Capability

RpProto Factory -CNC Machining Center

RpProto, located in Xiamen City, China, is your most reliable supplier, who has hundreds sets of 3, 5-axis CNC machines and turning center to offer you a precision rapid prototyping and new product development services, including milling, turning, EDM (electrical discharge machining), wire EDM, surface grinding etc.

Using our cut-ege 3, 5-axis CNC machining centers, our skilled machinists can make turned and milled parts using a wide range of plastic and metal materials. Our multi-axis CNC machining capabilities complement 3D metal printing service, making us a great one-stop shop for prototyping designs. We manufacture millions of machined plastic and metal parts every year for companies around the world. Please feel free to contact us to request your manufacturing solution.

Examples of CNC Machined Parts

RpProto machine rapid prototypes and low-volume production of plastic and metal parts for customers in all industries.

The most common areas are aerospace, automotive, electronics, machinery, manufacturing, medical devices, oil & gas and robotics.

Get a Quote for CNC Machining Service

Upload your 3D files to get a quick quote for your new project.


3 & 5 axis CNC Milling

Our factory has hundreds 3-axis, 5-axis CNC milling machines. Which can be used to create complex shapes from brasses, mild and stainless steels, aluminum, titanium, and rigid plastic.

The advantage of multi-axis milling machines makes the CNC milling process versatile,  and tight tolerances (0.02 mm), for creating many different types of part features of complex geometries. 

As well, Milling is best process to create pressure die casting and plastic injection molding tooling.

CNC Turning

RpProto employs advanced machines with live tooling and automatic bar feeders, allowing us to perform some tasks without the need for additional setups.

The turning process can produce complex external and internal geometrieswith very tight tolerances and excellent surface finishes.

CNC turning is a more efficient method for any round shaped component, such as shafts, worms, and spheres, and is suitable for rapid prototype low-volume production.

Producation Capacity & Facilities


parts a month


CNC Machines


CNC Turning Machines

cnc lathe machine

CNC Lathes

Features of CNC Machining

CNC Machining is the most common technics for rapid prototyping and volume production, because of the below features:

cnc milling

CNC Machining Materials

More than 40 different grades of metal and plastic materials are available at RpProto.

     • Metal:  Steel,  Aluminum(6061-T6, 7075),  Stainless Steel (17-4, Inconel 625 & 718),  Titanium,  Magnesium,  Zinc, Brass,  Bronze,  Copper.  Learn More…

     • Plastic: POM,Nylon,ABS,PEEK,PTFE,PC,HDPE,PVC,PMMA,PET,PP Learn More…

Some important characteristics of the most popular machining materials include:

Aluminum 6061-T6

Aluminum 6061-T6 6061 offers excellent machinability, low cost, and versatility.

Wall Thickness:     0.75 mm
Tolerances:    ±0.125mm (±0.005″)
Max part size:   200 x 80 x 100 cm
Aluminum 7075

Aluminum 7075 offers high strength, hardness, low weight, and heat tolerance.

ABS offers high impact strength, low heat conductivity, and low coefficient of friction.

this material provides high mechanical strength, superior dimensional stability, and low moisture absorption.

PEEK offers high abrasion and wear resistance, low moisture absorption, and low coefficient of friction.
Ultem (PEI)

Ultem (PEI) is a high-dielectric-strength material with great strength, stiffness, and chemical resistance.

Examples of material:

CNC Machining Surface Finishes

 We provide complete surface finishing options for precision machined parts, such as Anodizing,Bead Blasting,Powder Coating,Electroplating,Polishing,Brushing. Learn More…

Tolerances for CNC Machining


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:

Example of application of tolerances of CNC-Machining Metal

Tolerances for CNC Machining


0.5 – 6.00 mm± 0.10 mm
6.00 – 30.00 mm± 0.20 mm
30.00 – 120.00 mm± 0.30 mm
120.00 – 400.00 mm± 0.50 mm
400.00 – 1000.00 mm± 0.80 mm
Angular: ±0.5°
Surface Roughness 3.2μm Ra

With drawing: Tolerance quality equivalent to IT11 can be achieved.
Without drawing: ISO 2768 medium

Example of application of tolerances:

Example of application of tolerances of CNC-Machining Plastic

CNC Machining FAQs

CNC (Computer Numerical Control) machining is a subtractive manufacturing method. By subtracting and removing material, feedstock is machined to its final form. 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, and rigid plastics, etc.

Prices vary depending on the materials, complexity, quantity, and lead time. CNC Machining is more expensive than 3D printing, but it offers tighter tolerances and improved material properties and surfaces. To obtain an accurate price, upload your 3D CAD model.

For all CNC machined parts, we adhere to ISO 2768 standards. Metal parts will be machined in accordance with 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 clearly indicated in technical drawings.

CNC machining is used to rapidly manufacture prototypes and production parts. It offers a high level of precision, engineering-grade materials, and short lead times.

All machined parts will receive a standard inspection included in the part price and lead time.

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PMMA (Acrylic Plastic)

Plastic Material for CNC Machining Prototyping

Prototyping Materials  According to the materials used in the production, the prototype model can be divided into plastic prototype and metal prototype. At present, the mainstream material of the prototype model is plastic. It is due to the large number of applications of plastic products. The prototype model is directly produced with the same material,

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CNC Prototypes Manufacturing 2 : 2D and 3D milling

2D milling Mastercam 2D CNC machining automatic programming ability is the most advanced of all automatic programming software. Complete functions, fast post-processing speed and high efficiency. Two-dimensional CNC machining is also called 2.5-axis machining, which mainly includes machining paths such as contour milling, slotting, face milling, and drilling. Here are a few main tool paths

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CNC Machining

CNC Prototypes Manufacturing 1 : Programming and Optimization

The Importance of Prototypes The three-dimensional design software used in modern industrial design can intuitively express the three-dimensional model of the product on the screen, perform simulation assembly and motion simulation, and even static and dynamic analysis. But the screen is flat after all, and the size is limited, it can not be compared with

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aluminum part

Aluminium for CNC Machining Prototyping

Aluminum is a lightweight material. It is essentially non-magnetic, which makes aluminum suitable for CNC machining. It has a low deformation coefficient, high dimensional stability and impact resistance. Therefore, aluminum and aluminum alloys can maintain accurate dimensions under different conditions (such as temperature fluctuations, external shocks, etc.). Aluminum part Aluminum part Previous Next The most

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