CNC Milling

CNC Machining

SERVICE

CNC Milling

Prolean’s CNC milling services focus on manufacturing high-quality complex parts with tight tolerances in quantities ranging from small batches of prototypes to full production runs.

Our best-in-class three-axis and multi-axis CNC mills and a team of skilled professionals with years of experience combine to produce bespoke milled parts out of different materials.

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Quality Assurance

Competitive Pricing

Timely Delivery

High Precision

What is CNC Milling?

CNC (Computer Numerical Control) milling is one of the most widely used part manufacturing processed in modern industries.

In CNC milling, a multipoint cutting tool follows computer code to progressively remove material from a clamped workpiece to generate required shapes and contours. Wide range of metals, alloys and plastics can be CNC milled with high precision.

Almost all products require CNC milling at some point in their production because of CNC milling’s capability of producing accurate designs. The job of creating high-precision parts is one for state-of-the-art CNC mills.

Quality Assured:

Dimension Reports

On-time Delivery

Material Certificates

Tolerances: +/- 0.05mm or better on request.

3-aixs Milling

3-axis CNC milling is the most common type of milling process used in part manufacturing. Products with simple geometries that only require material removal in three directions are milled on 3-axis CNC mills with stationary tables for raw material and cutting tools that can move in X, Y and Z directions.

Prolean’s 3-axis CNC milling services offer economic prices for precision 3-axis CNC milled parts that all industries require in large numbers.

5-axis Continous CNC Machining

5-axis continuous CNC milling is the most advanced milling process used for manufacturing complex parts. Unlike indexed CNC milling where the extra two axes only change material position between operations, 5-axis continuous milling uses all five axes simultaneously which allows production of the most complex parts including the ones used in aerospace, robotics, automotive and medical industries.

Prolean’s skilled engineers and best-in-class 5-axis continuous CNC mills can produce your intricate parts with high accuracy.

What Materials Are Available For CNC Milling?

Aluminum	Steel	Stainless Steel	Other Metals	Plastics
Al6061	1018	303	Titanium Ti-6Al-4V (TC4)	ABS
Al6063	1045	304	Brass C360	PP
Al6082	A36	316	Brass C2680	POM-M, POM-C
Al7075	D2	316L	Alloy Steel 4140	PC
Al2024	A2	410	Alloy Steel 4340	PEEK
Al5083	20Cr	17-4PH	Copper C110	HDPE

Prolean offers a wide variety of materials for CNC Milling including both metals and plastics. Please see the list for a sample of the materials we work with.

If you require a material not in this list, please do get in touch as it is likely we can source it for you.

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Surface Finishes Options for CNC Machining

As Machined

Our standard finish is an “as machined” finish. It has a surface roughness of 3.2 μm (126 μin). All sharp edges are removed and parts are deburred. Tool marks are visible.

Smooth machining

A finishing CNC machining operation can be applied to the part to reduce its surface roughness. The standard smoothing surface roughness (Ra) is 1.6 μm (64 μin). Machine marks are less evident but still visible.

Brushing

Brushing is produced by polishing the metal with grit resulting in a unidirectional satin finish. Not advisable for applications where corrosion resistance is required.

Passivation

Passivation is a treatment method to protect the metal from corroding, it generates a more uniform formation of a passive surface that is less likely to react with air and cause corrosion chemically.

Anodizing hardcoat

Type III anodizing provides excellent corrosion and wear resistance, suitable for functional applications.

Electropolishing

Electropolishing is an electrochemical process used to polish, passivate and deburr metal parts. It is useful to reduce surface roughness.

Alodine/Chemfilm

Chromate conversion coating（Alodine/Chemfilm） is used to increase the corrosion resistance of metal alloys while maintaining their conductive properties.

Bead blasting

Bead blasting adds a uniform matte or satin surface finish on a machined part, removing the tool marks. This is used mainly for visual purposes and comes in several different grits which indicate the size of the bombarding pellets.

Powder Coating

Powder coating is a strong, wear-resistant finish that is compatible with all metal materials and can be combined with bead blasting to create parts with smooth and uniform surfaces and excellent corrosion resistance.

Black Oxide

Black oxide is a conversion coating used to improve corrosion resistance and minimize light reflection.

Here is a list of standard surface finishes. For custom surface finishes or other surface finish options, please check our surface treatment service

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Choose The Right Finish For Your Material

Different surface finishes can be applied to different materials. Find below a quick cheat sheet of surface finish and material compatibility.

Name	Material Compatibility
Smooth machining (1.6 Ra μm/64 Ra μin)	All plastics and metals
Bead blasting	All metals
Powder coating	All metals
Anodizing clear (type II)	Aluminum alloys
Anodizing color (type II)	Aluminum alloys
Anodizing hardcoat (type III)	Aluminum alloys
Brushing + Electropolishing (0.8 Ra μm/32 Ra μin)	All metals
Black oxide	Stainless steel and copper alloys
Chromate conversion coating	Aluminum and Copper alloys
Brushing	All metals

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If the Material and finishing you need are not one of the above, please feel free to contact us for more available.

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