Aluminium Machining Services

Precision CNC Aluminium Machining UK

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High-precision aluminium machining

Looking for a reliable aluminium machining partner? Penta Precision offers high-accuracy CNC aluminium machining for industries requiring precision, quality, and repeatability.

We provide expert CNC milling and turning for aluminium components, delivering tight tolerances, high-quality surface finishes, and fast turnaround times. Whether you need one-off prototypes or full production runs, our in-house capabilities ensure efficiency and consistency in every part.

Aluminium CNC Machining Capabilities

Our advanced CNC machining facility and skilled engineers ensure exceptional precision and consistency.

CNC Aluminium Milling

We offer precision aluminium milling using 3, 4, and 5-axis CNC machining centres. Our process ensures high accuracy for complex geometries, providing high-quality surface finishes with minimal waste.

We work with traditional 2D drawings (.pdfs, .tif, DXF or DWG files) and 3D models (.igs, .stp, sat, sldprt, stl, and vda formats). We also work from basic customer sketches or samples.

CNC Aluminium Turning

Our high-speed CNC turning process ensures excellent accuracy and repeatability for cylindrical components.

Using multi-axis turning centres and advanced CAD/CAM programming, we accommodate both small-batch prototyping and full production runs.

Custom Aluminium Components

We manufacture bespoke aluminium components designed to exact specifications.

Whether you need intricate features, lightweight solutions, or tight tolerances, our expertise ensures a precise, cost-effective process.

Our machining services

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CNC milling
High-precision CNC milling with 3, 4, and 5 axis CNC capabilities, ideal for complex geometries, tight tolerances, and repeatable production of custom parts.
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CNC turning
Automated multi-axis CNC turning for producing intricate or cylindrical CNC components in low or high volumes, using both modern and traditional equipment.
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Design for manufacture
Tailored design guidance to maximise efficiency, minimise production costs, and achieve precise, repeatable machining outcomes.
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Guidelines for CNC machining

Lead times

CNC tolerances

Finishing processes

Max dimensions

Tab one

Order Type Quantity Range Typical Lead Time Additional Info
Prototype 1–5 parts 1–4 weeks* May vary based on complexity and material, but is flexible to the part requirements. Contact us early to discuss.
Small Batch Production 6–25 parts 4–6 weeks Can occasionally be reduced to 2–3 weeks depending on capacity and material lead time.
Medium Batch Production 26–100 parts 4–6 weeks Best suited to scheduled or call-off ordering for consistency
High Volume Production 100+ parts 4–6 weeks Longer lead times. Kanban or call-off ordering strongly advised
Kanban / Call-Off Orders Varies 24–48 hours dispatch* Stock held at Penta. Dispatch triggered by usage or schedule. Order is invoiced or paid upon call-off.
Tab two

Process
Range of Tolerances Achievable
Notes
Milling >±0.01 mm Dependent on part geometry, material and setup. 5-axis offers tighter tolerances and better repeatability.
Turning >±0.01 mm High-precision turning across billet and bar work, supported by modern multi-axis machines.
Geometric Tolerances >±0.010 mm* *Depending on material, finishes, and the geometry of the part.
CMM Measurement Verification to ±0.002 mm Achieved using our CNC CMM with 2.3µm volumetric accuracy and temperature compensation.
Tab three

Finishing Process Purpose Additional Information
Hard Anodising Adds a protective oxide layer to aluminium parts. Usually 25–30 microns thick. Typically used for parts designed for the outdoors and general engineering for corrosion resistance. This finish requires hole masking and machining allowance, so use only if needed.
Sulphuric Anodising Adds a decorative layer to aluminium. Less than 5 microns thick. Won’t offer any protection and minimal corrosion resistance. For decorative or aesthetic purposes only.
Bead Blasting Creates a uniform matte finish that removes tool marks. Ideal for reducing reflectivity and improving surface uniformity.
Powder Coating Provides a hard, colourful coating that is tough and wear-resistant. Commonly used on enclosures, brackets, and consumer-facing components.
Chromate Conversion Plating Enhances corrosion resistance while retaining electrical conductivity. Often applied to aluminium components used in electronic assemblies. Commonly referred to as Surtec or Iridite.
Polishing Achieves a smooth, high-quality surface for aesthetic or functional use. Used in medical, optical, or high-spec applications where surface finish is critical.
Nickel Plating Applies a thin layer of nickel to improve corrosion and wear resistance. Provides a bright, uniform finish. Often used for decorative parts or where moderate hardness and conductivity are needed.
Zinc Plating Adds a protective zinc layer to prevent rusting, especially on steel parts. Usually applied with a clear, yellow, or black passivate. Cost-effective option for corrosion resistance in less aggressive environments.
Burnishing Improves surface finish and work-hardens the material through controlled deformation. Produces a smooth, polished surface without material removal. Enhances fatigue strength and aesthetic appearance.
Ultrasonic Cleaning Removes fine particles, oils, and machining residue using high-frequency sound waves. Commonly used as a pre-finishing or pre-assembly process. Ideal for complex geometries and internal features. Leaves no residue.
Assembly Combines multiple components into a finished or semi-finished assembly. Used to streamline production workflows. May include press fitting, fasteners, inserts, or other mechanical joining methods.
Tab four

Process Maximum Dimensions Notes
Milling Up to X: 1000 mm, Y: 600 mm, Z: 550 mm Based on Doosan and Matsuura 5-axis machines. Max Ø350 mm × 300 mm height for 5-axis work.
Turning Max billet Ø380 mm × 580 mm length
Max bar Ø65 mm × 1100 mm length		 Applies across Mazak, Doosan Puma, and CMZ lathes. Includes Y-axis and driven tooling.
Tab five

Components & applications

We machine custom aluminium parts for a wide range of industries and use cases. From structural components to detailed enclosures, our aluminium CNC service ensures consistency and precision. Customers rely on us for both functional prototypes and full-scale production parts.

Common aluminium components include:

Fluid & vacuum

Lightweight aluminium with excellent corrosion resistance makes it ideal for pressure and flow systems.
- Pressure vessels
- Connectors
- Manifolds

Rotating, sliding & wear

Aluminium can be machined to tight tolerances, supporting smooth motion and durability in moving parts.
- Pivots
- Bushes
- Bearings
- Sleeves

Structural & mounting

Strong yet lightweight, aluminium is widely used for load-bearing and framework elements.
- Flanges
- Brackets
- Beams
- Plates
- Spacers

Housing & enclosure

Protective and lightweight, aluminium housings are often chosen for electronics, instruments, and precision assemblies.
- Enclosures
- Housings
- Heatsinks

Guidance & handling

Machined aluminium guides and arms ensure accuracy, stability, and ease of movement.
- Guides
- Guide pullers
- Arms
- Handles

Fastening & fittings

Durable and lightweight, aluminium is suited to functional components that connect, secure, or support assemblies.
- Pins
- Latches
- Hooks
- Buttons

Common industry applications

Aerospace

Aerospace

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Marine

Marine

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Petrochemical

Petrochemical

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Nuclear

Nuclear

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Automotive & Transport

Automotive & Transport

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Military & defence

Military & defence

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Oil & gas

Oil & gas

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Food processing & packaging

Food processing & packaging

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Electronics & computing

Electronics & computing

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Pharmaceutical & medical

Pharmaceutical & medical

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Aluminium CNC equipment we use

Matsura MAM72-35V

Automated 5-axis CNC Milling
Max. Work Size: Ø350 mm x H300 mm
Travel X / Y / Z: 550 / 440 / 580 mm
32 pallets, 240 cutting tools

Doosan VC630 5AX

5-axis CNC Mill
X-Axis Travel: 650 mm
Y-Axis Travel: 750 mm
Z-Axis Travel: 500 mm

Doosan Puma 2600SY

CNC Lathe
Max bar dia: Ø65 mm
Max bar length: 1100 mm
Max billet dia: Ø270 mm

Mazak Quick Turn 200MY

CNC Lathe
Chuck size: 8"
Max. machining dia: Ø380 mm
Max. processing length: 38 mm / 1047 mm

Mazak Quick Turn 100M

CNC Lathe
Chuck size: 6"
Max. machining dia: Ø280 mm
Max. processing length: 340 mm

CMZ TL20 MS

CNC Lathe
Max bar dia: Ø65 mm
Max bar length: 1100 mm
Max billet dia: Ø270 mm

CMZ C20 YS

CNC Lathe
Max bar dia: Ø65 mm
Max bar length: 1050 mm
Max billet dia: Ø230 mm

CMZ TL20 MS

CNC Lathe
Max bar dia: Ø65 mm
Max bar length: 1000 mm
Max billet dia: Ø350 mm

Doosan DNM 500

5-axis CNC Mill
X-Axis Travel: 1000 mm
Y-Axis Travel: 500 mm
Z-Axis Travel: 500 mm

Doosan DNM4500 4AX

5-axis CNC Mill
X-Axis Travel: 800 mm
Y-Axis Travel: 450 mm
Z-Axis Travel: 510 mm

Bridgeport VMC1000 4AX

4-axis CNC Mill
X-Axis Travel: 1000 mm
Y-Axis Travel: 600 mm
Z-Axis Travel: 600 mm

Bridgeport VMC 600 4AX

CNC Mill
X-Axis Travel: 600 mm
Y-Axis Travel: 400 mm
Z-Axis Travel: 350 mm

Bridgeport VMC 760

CNC Mill
X-Axis Travel: 760 mm
Y-Axis Travel: 600 mm
Z-Axis Travel: 480 mm

Bridgeport XR1000

CNC Mill
X-Axis Travel: 1000 mm
Y-Axis Travel: 600 mm
Z-Axis Travel: 600 mm

Bridgeport VMC 500

CNC Mill
X-Axis Travel: 550 mm
Y-Axis Travel: 350 mm
Z-Axis Travel: 350 mm

What our clients say

Mark
Mark, Project Procurement and Quality Specialist
You’re absolutely one of our most valued suppliers. Quality is always fantastic, quote turnaround times are excellent, and your team are always happy to help.
Nick
Nick, Operations Manager
Penta Precision have consistently provided us with excellent service... which is reinforced by their attentive and customer-focused team, who maintain a high standard of communication throughout the process.
Andrea
Buyer
Penta is highly recommended for their quality, responsiveness and customer service. We have experienced a lot of change with our parts and Penta has always accommodated the adjustments needed in a timely manner. The quality is 100%.

Examples of our high-quality aluminium CNC machined components

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Aerospace side member

Aluminium machining
CNC Milling
Aluminium L168
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Heatsink

Aluminium machining
CNC Milling
Aluminium
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3U or 6U satellite module

Aluminium machining
CNC Milling
Aluminium 7075 with hard anodising
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Aerospace tray table arm

Aluminium machining
CNC Milling
Aluminium L95
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Machined electronic heatsink

Aluminium machining
CNC Milling of extrusion
Aluminium with alocrom 1200
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Machined R&D Aluminium Prototype

Aluminium machining
CNC Milling
Aluminium
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Milled Aluminium Bracket

Aluminium machining
CNC Milling
Aluminium 7075

More about aluminium CNC machining

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Selecting an aluminium alloy

Materials
13 May 2024

Selecting the appropriate material and grade is among the important early decisions you'll make when designing your CNC machined component. In this blog we look at the most common grades of aluminium, one of the most versatile metals, and the factors to consider to select the best grade for your next project.

Common questions

What tolerances can you achieve for aluminium parts?
What is your lead time for aluminium CNC machining?
Do you offer one-off prototypes as well as batch production?
Do you offer first article inspection or quality reporting?