CNC Machining Services

CNC Aluminum Part

CNC Rapid Prototyping Service

Our CNC Machining Capability

Our Facility

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

Using our cut-edge 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 the 3D metal printing service, making us a great one-stop shop for prototyping designs. We manufacture millions of machined plastic and metal parts annually for companies worldwide. Please feel free to contact us to request your manufacturing solution.

Examples of CNC Prototyping

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

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

CNC Machining Aluminium Parts
CNC Milling Aluminum Parts
Stainless Steel Turning Part
CNC Turning Parts
Machining Steel Parts

CNC Milling

Our factory has hundreds of 3-axis, and 5-axis CNC milling machines, which can create complex shapes from brasses, mild and stainless steel, aluminium, titanium, and rigid plastic.

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

Milling is also the best process to create pressure die casting and plastic injection molding tooling.

Our Facility

CNC Turning

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

The turning process can produce complex external and internal geometries with 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.


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 following features:

cnc milling

CNC Machining Materials

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

  • Metal:  Steel,  Aluminium(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:

Aluminium 6061-T6

Aluminium 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
Aluminium 7075

Aluminium 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 wears 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:

ly12 hard aluminum
purple copper
PP Board
pa66 gf
Glass Fiber Filled Black Nylon

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…

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. 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. CNC Machining is more expensive than 3D printing but 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. 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.

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