CNC Milling Service

Our 3-axis & 5-axis CNC milling center is dedicated to creating complex geometries and features

  • Tolerances down to ±0.0002″ (0.005mm)
  • Parts as Fast as 1 days
  • Aluminium, Steel, Copper, Polymers & More
  • 3 & 5-Axis Milling
Steel automotive components created with CNC milling
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Why Choose Our CNC Milling Service

Prolean is dedicated to precise drilling, boring, reaming, milling planes, bevels, grooves, surfaces (cams), and tapping in various workpieces with various structures and shapes.

Using Multiaxis -CNC milling machines, we produce high-quality parts based on specified designs for commercial and industrial applications. We are eager to work with you to deliver precise CNC machined parts for your project.

CNC Milling Material Options

Aluminum CNC Milling

Experience precision and expertise with our Aluminum CNC milling service. we specialize in transforming aluminum into intricate and durable components. Tailored to your specific needs, our process ensures impeccable results every time. Below, discover the diverse range of aluminum alloys we adeptly handle for machining.”

Aluminum (MIC6)
Aluminum (2024)
Aluminum (5052)
Aluminum (5083)
Aluminum (6082)
Aluminum (6061-T6)
Aluminum (6063)
Aluminum (7075-T6)

Brass CNC Milling

Our Brass CNC milling service. Utilizing cutting-edge machinery, we expertly sculpt brass into intricate designs and robust parts. Whether you’re seeking ornate detailing or industrial strength, our brass milling caters to every requirement.

Brass, with its radiant golden hue, offers low friction and superior machinability. Ideal for its high electrical and thermal conductivity, Brass is easily machined, making it preferred for low-friction tasks. Explore our list below to find the specific brass alloys we masterfully process.

Subtypes: C360, H59, H62


Copper offers good strength, hardness, and excellent corrosion resistance with superior heat and thermal conductivity. 
Copper CNC milling offers precise and consistent results. We understand the unique characteristics of copper and ensure optimal machining processes for this metal.
Curious about the specific copper alloys we work with? Check the list below for a detailed overview

Subtypes: 101, C110


High mechanical strength, toughness, resistance to wear and fatigue, and sturdiness. In addition to carbon, other alloying elements can be added depending on the needed mechanical and physical qualities.

Subtypes: 1018, SPCC


Stainless Steel

High mechanical strength, Thermal, Wear, and Corrosion resistance. Stainless steel is low-cost and can be machined easily. Parts made from Stainless steel are durable and do not lose that strength over time.

Subtypes: 301, 304, 316

Plastics materials for CNC milling

CNC milling is one of the most versatile machining processes available. In addition to common metals, it can also process parts made of plastic materials. Frequently processed plastics include:

ABS, Acrylic, and Delrin, Garolite G-10, FR4, Polyethylene (PE);

Nylon, PEEK, Polycarbonate (PC),  Polypropylene(PP), PPSU (Polyphenylene sulfone resins);

PPS (Polyphenylene), PTFE (Teflon), polyetherimide (PEI), PVC

Precision Machining Tolerances

CNC Milling Service

Manufacturing Specifications & Capabilities



No Drawing

Linear dimension +/- 0.025 mm
+/- 0.001 inch
ISO 2768 Medium
Hole diameters (not reamed) +/- 0.025 mm
+/- 0.001 inch
ISO 2768 Medium
Shaft diameters +/- 0.025 mm
+/- 0.001 inch
ISO 2768 Medium
Part size limit 950 * 550 * 480 mm
37.0 * 21.5 * 18.5 inch
ISO 2768 Medium

How to Order Parts?

Get a free quote from a real engineer; once we receive your design, our engineer will review it and send you a quote as fast as one hour.

Get A Quote Within 12 Hours

Upload your design or email our engineer directly and get your quotes as fast as one hour.

Start Production

Your parts will be made once your orders are confirmed. Besides, you will get real-time order updates of the production status from our order tracking system.

Receive Your Part

After all parts pass QC inspection, they will be well packed from transportation accidents. Then, your custom parts are delivered straight to your doorstep.

: We generally evaluate production and provide quotations within six hours. If you need a more urgent quote within 1 hour, please contact us directly through our official WhatsApp account or Skype for immediate communication.

CNC Milling Material Guide

Finishing Options

As the machined or deburring

The machined or deburring finish is the standard finish where unwanted attach chips are removed with deburring tools, and sharp edges are chamfered to smooth the surface (3.2 μm).

Bead Blasted

Bead blasting produces a matte texture, removing all the marks of machining tools. It applies to ABS, Aluminum, Brass, Stainless Steel, and Steel parts.


Anodizing involves adding an aluminum oxide coating to aluminum and its alloys. The layers, which come in various colors, increase strength and shield the surface from corrosion.

Powder coating

Powder coating is the electrostatically applying of dry powder to the surface. It produces a thin layer providing excellent resistance to wear, corrosion, and abrasion.


Physical rubbing of a metal surface to create a shiny surface is called a polishing surface finish. It increases the reflectivity and does not affect the dimensional stability of parts.


Brushing is achieved by applying an abrasive brush to the metal surface, which produces a unidirectional satin finish. And it is not recommended for highly corrosive materials.

Smooth machining

Smooth machining is done by controlling the machining process, such as feed rate & cutting speed. It minimizes the tool marks and risk of corrosion.


Black oxide finish reduces surface reflectivity and offers mild corrosion protection. It involves adding a thin layer of magnetite to the surface.


Electro-less Nickel Plating

A thin layer of Nickel is created on the surface from a nickel-containing solution without electrolysis. Electro-less nickel plating provides a shiny appearance, excellent hardness, abrasive, wear, and corrosion-resistance to the substrate material.


Provides excellent corrosion resistance property to the aluminum parts with greenish-gold color. It is the low-cost and quick surface finishing approach.


Electroplating increases the hardness of the steel &aluminum parts. It offers excellent corrosion, wears, and abrasion resistance.

Nickel plating

Make the parts super resistive to corrosion. It enhances mechanical strength, hardness, wear resistance, lubricity, and ductility. Nickel plating is applicable in different materials, including Steel, aluminum, copper, and brass.


Enhance the appearance and functionality of the parts. After Passivation, parts of Steel and its alloys become super resistive from corrosion.

Yellow Chromate conversion coating

A shiny appearance with goldish color provides excellent corrosion resistance. It is applied on the surface of aluminum, magnesium, and their alloys. A layer of chromate also enhances the conductivity of parts

PTFE (Teflon) Coating

The Teflon layer on the parts offers excellent corrosion resistance, water resistance, and non-stickiness with a non-reactive surface.

Fine machining

The higher-precision machines produce delicate machining surfaces by utilizing sharper tools and regulating feed rate and cutting speed. Surface roughness up to Ra 0.8 μm can be maintained with smooth machining.

Laser Cladding

Provides excellent corrosion, wear, and abrasion resistance. Laser Cladding is also effective for treating minor surface imperfections such as cavities, tiny cracks, and rust damage.


Provides a random, non-linear texture with a shiny, high gloss finish. However, it might be unable to create sharp corners and pockets

3 Ways to Ensure Perfection


Metals: ISO-2768 fH (fine)

Plastics: ISO-2768 mK (medium)

Metric threads tolerances: ISO 965-1 standard UN Threads Tolerances: ASME B1.1-2003 standard

Knurling: ISO13444:2012 standard. Our factory is ISO 9001:2015 certificated

Inspection and Protection

Constant visual inspection conditions

Quantification of cosmetic surface quality

Process requirements

Part cleaning and Protection

Quality Inspection Report

Inspection Confirmation

Dimensional confirmation

Appearance confirmation

Quality documentation

Technology Overview

What is CNC Milling?

CNC milling is an abbreviation for Computer Numerical Control milling. So, the milling operations are numerically controlled by the computers here. CNC milling machines, like cutting and drilling machines, use rotary tools to cut away at a workpiece into the desired shape. Because a computer controls the movement of tools and other machine parts, there will be no human error, resulting in precise parts with tight tolerance. CNC milling can work with any manufacturing material, from steel to plastic.

The instructions for part creation are generated when we load the CAD file into the CNC milling machines. The computer controls the coordinates and positions along with the tool’s movement. CNC milling is used in many industries Such as automotive, aerospace, defense, Medical, and more.

Principle of CNC Milling

The milling process begins with the positioning of the workpiece and tools. Next, the workpiece is inserted into a holding device, and tools are inserted into the spindle. The CAD file determines the milling direction (horizontal or vertical). Once the tool and workpiece placement is complete, a program is edited and executed. The tools are now moved to create the desired shape based on the instructions.

The milling cutter tools move through the multiple axes to create the parts where several operations other than cutting might be needed, such as drilling holes and slots. A milling cutter can move along multiple axes and make several shapes, slots, holes, and other impressions. Milling machines usually have four directions for operations X, Y, Z, & W. The horizontal movement is represented by X and Y. The Z axis represents vertical movement, whereas the W axis represents diagonal movement across a vertical plane.

Different types of CNC Milling

There are four common types of CNC milling operations. Plane, face, angular, and form milling are all options. These milling operations are selected during manufacturing based on the work piece’s shape requirements.

Face milling uses a tool with teeth on its periphery and face. The peripheral teeth cut the workpiece, and the face teeth finished the surface. The plane of the workpiece is positioned at a right angle to the tool axis.

In Angular milling, the cutting tool is placed in a way that makes a specific angle to the workpiece surface to create a design-angle cut, such as a groove or a dovetail. It is generally applicable when Milling planes are neither parallel nor perpendicular to the tool axis.

The milling of irregular surfaces like curve planes is accomplished by form milling with the help of a special cutter called a formed cutter. Various complex parts needed to be created convex, concave, hemispherical, or other complicated shapes, Thanks to formed milling.

Plain milling, also known as surface milling, is the most commonly used type of milling in which the milling cutter axis is parallel to the surface being milled. It is the best method when a large amount of material needs to be removed.

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Technical FAQ’s

What is the lowest thickness I can implement into my design to prevent warpage?

We recommend a minimum thickness of 0.5mm for metal and 1mm for plastic. The value, however, is heavily dependent on the size of the parts to be manufactured. For example, if your parts are much smaller, you may need to increase the minimum thickness limit to prevent warpage, and for large parts, you may need to lower the limit.

What is a 5-axis CNC machine?

Five-axis CNC machines can move through 5-axes, allowing the operator to simultaneously mill over five sides of a workpiece.The A, B, and C axes rotate separately from the X, Y, and Z axes. The machine’s configuration or CAD design determines which two of the three additional rotational axes are used.

General FAQ’s

What kind of CNC milling equipment do Prolean use?

We have rapid prototyping facilities at prolean that include high-end 3-axis, 4-axis, and 5-axis CNC machining centers from Haas and JingDiao.

Why choose CNC milling?
Because CNC machines rely on computer control, they can produce highly precise parts in a short period. For example, we have a 5-axis CNC milling machine that allows us to manufacture parts with complex geometries quickly.
What is the key difference between CNC milling and Turning?
The CNC milling method utilizes rotatory tools and a stationary workpiece, whereas the turning process rotates the cylindrical workpiece, and the tool remains stationary to achieve the desired shape.


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