CNC Machining Service

Penta Precision is a trusted provider of CNC machining services in the UK, delivering high-quality CNC machined components with care and consistency.

Our CNC machining service is built on precision, reliability, and clear communication, supporting customers across industries including aerospace, medical, defence, and manufacturing. Whether you need one-off custom CNC parts or high-volume CNC components, we work with you to ensure the right outcome for your project.

We machine a wide range of CNC machining materials, including aluminium, stainless steel, and engineering plastics. With advanced capabilities including 5 axis CNC machining and automated production, we’re equipped to handle projects of all sizes and complexities. If you’re looking to get CNC parts made and want a team that prioritises quality and service, Penta is here to help.

CNC machining capabilities

We offer a wide range of CNC machining services, from one-off prototypes to full production runs. Our capabilities include CNC milling, CNC turning, and 5 axis CNC machining using advanced technology and highly skilled engineers. With a focus on quality, accuracy, and reliability, we deliver CNC machined components that meet exact specifications every time, making it easy to order CNC parts with confidence.

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.

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.

Design for manufacture

Tailored design guidance to maximise efficiency, minimise production costs, and achieve precise, repeatable machining outcomes.

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Materials we machine

Guidelines for CNC machining

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

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 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

Mazak Quick Turn 200MY

CNC Lathe

Chuck size: 8"

Max. machining dia: Ø380 mm

Max. processing length: 38 mm / 1047 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

Doosan Puma 2600SY

CNC Lathe

Max bar dia: Ø65 mm

Max bar length: 1100 mm

Max billet dia: Ø270 mm

Why choose Penta Precision

Make your next move with confidence.

Get a quote today

No fuss. Just clear quotes and quality parts.

Experts with passion

Our team of in-house specialists  bring unparalleled expertise, care and personalised support to every project.  We don’t just deliver parts; we work hard  to bring reliable innovative ideas to  ensure your success.

Exceptional quality, every time

Our commitment to quality drives everything we do. Our thorough  in-house proven process ensures  we deliver high-performing, precision -engineered components that help  your business succeed.

Building effortless partnerships

We work and communicate with you  at every stage - offering design support, bespoke solutions, and opportunities  for improvement to ensure your goals  are achieved, and you feel confident  in your delivery.

What components can we machine?

We machine a wide variety of CNC parts to suit different functions, performance requirements, and environments.

From structural brackets to fluid-handling manifolds, our team produces high-quality CNC machined components across many industries. We work with both plastics and CNC machining metal materials to meet varied customer requirements.

Structural & mounting

These provide strength, alignment, and mounting points in assemblies.
- Brackets
- Flanges
- Beams
- Collars
- Spacers

Rotating, sliding & wear

Parts designed to handle motion, friction, and wear.
- Bearings
- Bushes
- Sleeves
- Pivots
- Guide pullers
- Arms
- Scraper blades

Housing & enclosure

Protecting sensitive equipment, electronics, or mechanical parts.
-Enclosures
- Casings
- Housings
- Guards
- Covers

Thermal & pressure management

Components designed for heat dissipation or high-pressure applications.
- Heatsinks
- Manifolds
- Flow plates
- Pressure vessels

Connection & fastening

Joining systems, mechanical fixings, and fluid routing components.
- Connectors
- Pins
- Latches
- Hooks
- Buttons
- Handles
- Manifolds
‍

Medical & surgical

Precision-engineered components for medical and life sciences.
- Surgical instruments
- Medical implants

Precision & custom components

Specialist or tight-tolerance parts including jigs, fixtures, prototypes, tooling, blocks and custom CNC components.

CNC machining capabilities

Our machining services

Materials we machine

Aluminium

Plastic

Stainless steel

Titanium

Copper

Brass

Bronze

Guidelines for CNC machining

Lead times

CNC tolerances

Finishing processes

Max dimensions

Process

Range of Tolerances Achievable

Notes

CNC equipment we use

Matsura MAM72-35V

Doosan VC630 5AX

Doosan DNM4500 4AX

Bridgeport VMC1000 4AX

Mazak Quick Turn 200MY

CMZ TL20 MS

CMZ C20 YS

Doosan Puma 2600SY

What components can we machine?

Structural & mounting

Rotating, sliding & wear

Housing & enclosure

Thermal & pressure management

Connection & fastening

Medical & surgical

Precision & custom components

Examples of our high-quality CNC machined components

Enclosure

Filter

Materials testing component

Sequencing chamber

Rod

Paddle stirrer

Sealing die

Baffle cage support bracket

Electronic enclosure lid

Black anodised speaker component

Machined copper connector

Machined electronic test tooling

Machined electronic heatsink

Machined aerospace seating bracket

Aerospace tray table arm

3U or 6U satellite module

Aerospace side member

Electronic enclosure

Heatsink

Sensor Block

Bar Seal Die

Brass Block

Milled Aluminium Bracket

Conductivity Reference Standards

Machined R&D Aluminium Prototype

Bronze Component with Thread

Bronze Bushing

Space Component - Tray on 3U/6U Satellite

What our clients say

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Common questions