Milling & Turning Combination

CNC Machining

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Milling & Turning Combination

Today’s most advanced CNC technologies allow multiple operations on a single machine. Mill-turning is one of the latest advanced CNC machining processes that can reduce production costs and create high-precision parts that might be impossible for traditional CNC mills and lathes.

Prolean’s CNC mill-turning services are perfect for high precision parts with complex geometries that might be expensive to produce on 5-axis CNC mills and turning centers separately.

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Prolean CNC Mill-turning

CNC mill-turning is a complex process which requires state-of-the-art machinery and engineers with knowledge of the latest CNC technology.

Prolean’s mill-turning services have both. Prolean’s skilled engineers use mill-turning efficiently to take the total advantage of the modern process.

Quality Assurance

Competitive Pricing

Timely Delivery

High Precision

What is CNC Mill-turning?

CNC mill-turning is combination of CNC milling and turning operations performed on one machine without the requirement of manual positioning and fixturing for next operation. The milling and turning operations are not distinct in any other way but the ability to perform both operation on same machine gives mill-turning advantages over separate CNC milling and turning.

CNC mill-turning machines uses tool arrangements for turning and milling tools. A turret holds different tools required for milling and turning operations and makes them readily available for processes. The raw material is on a spindle that can rotate at high speeds for turning operations and can also work with the rotating milling tools. Continuous 5-axis mill-turning machines can even move the tool as well as raw material at the same time to create complex geometries.

Quality Assured:

Dimension Reports

On-time Delivery

Material Certificates

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

Advantages of CNC Mill-turning

The combined milling and turning possible with CNC mill-turning gives it several advantages over the individual CNC processes. The evident primary advantage is rapid production since almost all operations are possible on the same machine.

When part production uses multiple machines, the repositioning and fixturing takes time and also affects the tolerances. Even if the machine has high precision, the manual positioning affects the tolerances and makes it hard to produce high-precision parts with tight tolerance. The reduced positioning and fixturing also improves the accuracy and precision of parts produced. CNC mill-turning costs less than any other 5-axis CNC machining process for the same part.

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What Materials Are Available For CNC Mill-turning?

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 Mill-turning 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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