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 one day
  • Aluminium, Steel, Copper, Polymers & More
  • 3 & 5-Axis Milling

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Home 9 CNC Milling Service

Prolean’s CNC Milling Service

3 Axis CNC Milling

Looking for precision and affordability in your manufacturing process? Look no further than 3-axis CNC milling. This technology provides accurate results for simple parts without breaking the bank.


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Industrial Equipment

Consumer Products Industry

Electronics Industry

4 Axis CNC Milling

4-Axis CNC Milling delivers precise, complex machining at an affordable price. Ideal for advanced designs, it offers greater accuracy than 3-axis milling without a high cost.


Suggest Industry Application:

Automotive CNC milling

Medical CNC Machining


5 Axis CNC Milling

“5-Axis CNC Milling provides top-tier precision for complex designs, maintaining cost-effectiveness. It’s a step beyond 4-axis, offering advanced machining with great accuracy.”


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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.

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

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 Machining Materials Options


Aluminum is a superior metal in terms of strength-to-weight ratio. It offers High Machinability, ductility, and thermal & electrical conductivity. Parts with aluminium also become highly resistant to corrosion.
Aluminum (MIC6) Aluminum (2024) Aluminum (5052) Aluminum (5083) Aluminum (6082) Aluminum (6061-T6) Aluminum (6063) Aluminum (7075-T6) Learn more
Golden shiny color, low friction, excellent Machinability, and high electrical & thermal conductivity. Brass can be easily machined and the best choice for low-friction applications.
Brass (360)   Learn more
It offers good strength, hardness, and excellent corrosion resistance with superior heat and thermal conductivity. It also has a very appealing aesthetic.
Copper 101
40% more strength-to-weight ratio than steel, Excellent corrosion resistance, low thermal expansion, and biologically inert. These properties make it perfect for automotive, aerospace, and medical applications.
Grade 1 Titanium Grade 2 Titanium Grade 5 Titanium(TC4, Ti6Al4v) Learn more
Alloy Steel
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.
Alloy Steel 4130 Alloy Steel 4340 Steel (4140 Alloy) Steel (1018 Low Carbon) Tool Steel (A2) m2 d2 20GR Zinc-Galvanized Low-Carbon Steel Carbon Steel (1045)
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.
Stainless Steel 201 Stainless Steel 301 Stainless Steel 303 Stainless Steel (304L) Stainless Steel (316L) Stainless Steel (410) Stainless Steel (420) Stainless Steel (440C) Stainless Steel (17-4 PH)   Learn more
Cast iron
It offers three to five times higher compression strength than steel. Low-notch sensitivity, Good Resistance to deformation, excellent anti-vibration, and consistent mechanical properties


Excellent strength, extraordinary impact, and abrasion resistance with chemical inertness. ABS can be machined easily and is very easy to paint and glue.
Acrylic is a lightweight, rigid thermoplastic with optical clarity. It is one of the superior alternatives to glass, offering excellent weather and chemical stability.
High tensile strength, excellent Machinability, Stiffness, wear resistance, creep resistance, and low friction. Overall, Delrin is the ideal replacement for metal.
Delrin (30% Glass-Filled)

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Garolite G-10
High strength-to-weight ratio, fire resistance, low thermal expansion coefficient, and water absorption coefficient are entirely free from corrosion risk. Garolite is perfect for insulating parts and electric circuit boards.
FR-4 is a manufacturing material with strength almost equal to steel and lightweight. It is a perfect fit for making parts for the electrical marine industry since it is flame retardant, has a negligible water absorption coefficient, and is machinable.
Polyethylene (PE)
Polyethylene is known for its malleable properties. It offers a high strength-to-weight ratio, impact strength, chemical inertness, temperature, and weather resistance.
Mechanical properties include high resilience, tensile strength, and fatigue resistance. Nylon is a flexible manufacturing material that is highly resistant to abrasion, heat, chemicals, water, and oils.
Nylon (30% Glass-Filled)

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A versatile engineering material with high mechanical strength. It provides excellent thermal and chemical resistance. Parts from PEEKS are durable and can be operated at an extensive range of temperatures (up to 2600).
PEEK (30% Glass-Filled)

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Exceptional mechanical properties, including impact strength, toughness, Stiffness, and creep resistance. Because of its transparent nature, Polycarbonate (PC) is a lightweight alternative to glass. Learn more
A low-cost material with good Stiffness, impact resistance, and chemical stability. PP also offers excellent wear resistance and elasticity.
PPSU(Polyphenylene sulfone resins)
PPSU is used in various sectors because of its lightweight, high toughness, excellent impact resistance, high heat resistance, chemical stability, transparent color, and wide operating temperature range
PPS (Polyphenylene)
The unique combination of Physical, mechanical, and chemical properties. Excellent strength, rigidity, fatigue endurance, creep resistance, chemical inertness, and a wide range of working temperatures for the fabricated parts make it a perfect choice for electrical applications with high operating temperatures.
PTFE (Teflon)
High chemical inertness, thermal stability, electrical insulation, and corrosion resistance. Teflon is a low-friction substance that is perfect for making non-sticky and sliding parts for various industries. Learn more
polyetherimide (PEI)
Semi-transparent, high strength, rigidity, thermal stability, chemical inertness, and dimensional stability. Parts made from PEI can work for an extended period without stress cracking.
PMMA (Acrylic)
Transparent, lightweight, strong mechanical strength, hardness, thermal stability, and chemical inertness. Transparent nature makes it an excellent alternative to glass.

CNC Milling Material Guide

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Finishing Options For Milling Service

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


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

CNC Milling Service Tolerances

Tolerances and Machining Stardands For CNC Milling



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

3 Ways to Ensure Perfection



For metals, the standard is ISO-2768 fH (fine)

For plastics, the standard is 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

Visual 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

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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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