Plastic CNC machining service

We deliver precision plastic CNC machining for functional and aesthetic components, with the engineering expertise needed to protect quality, fit, and finish.

From material advice to inspection, Penta helps you achieve reliable plastic machined parts with less risk, clearer support and better control throughout production.

ISO 9001 Certified
JOSCAR Registered
MakeUK Defence Member
Leanne
Senior buyer at bicycle firm
We’ve worked with Penta on several complex projects, and their consistency and attention to detail have been second to none. The team is quick to respond and flexible.
Russell
Medical and Pharmaceutical & OEM
Customer service is always very professional with everything done to a great detail expertise. Final product is also to a very high standard.
Mark
OEM
Overall really happy with Penta's service, 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. Some of our parts are particularly difficult to machine and I appreciate the effort your quoting team go to in trying to work a solution for us.
Simon
Industrial & Marine
Penta provide an excellent service from start to end. Friendly and knowledgeable consultant and advice, superb communication throughout, outstanding attention to detail, flawless engineering and machining, on time supply, transparent pricing, clear and accurate paperwork. A genuine pleasure to do business with.
Steve
Steve, Scientific and Technical
Excellent service, friendly and helpful staff. Never had a non-conformance on our system for Penta Precision.
Agnieszka
Assistant Buyer, Electronics OEM
I would highly recommend Penta Precision in whole, not only the product quality is consistently outstanding and the pricing competitive, but also the service is excellent.
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Reliable plastic machining support

Our plastic CNC machining services

Penta Precision provides dedicated plastic CNC machining services for functional and aesthetic components across a wide range of engineering plastics. Our team understands the challenges of machining plastic, including thermal movement, material behaviour, surface finish and dimensional stability.

You get practical advice, clean results and dependable lead times from a UK machining partner that considers material behaviour, finish and inspection before production starts.

British Assessment Bureau ISO 9001 Quality Management Accreditation
JOSCAR Registered Logo
Make UK Member Logo
Milled and turned plastic components

Precision plastic milling and turning

We produce accurate plastic milled and turned parts for prototypes, small batches and repeat production, using CNC milling, CNC turning and CAD/CAM programming to support your project from enquiry to delivery.

Consistent dimensional accuracy
Reliable repeat production
Expert engineering guidance
High-quality surface finishes

Our machining services

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Examples of our high-quality CNC machined components

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Plastic machining
CNC Turning
PTFE

Baffle cage support bracket

Plastic machining
CNC Milling
Nylon

Plastic Turned Component

Plastic machining
CNC Turning
Engineering Plastic

Acetal tooling

Plastic machining
CNC Turning
Black delrin

Threaded component

Plastic machining
CNC Turning
Engineering plastic

Enclosure component

Plastic machining
CNC Milling
Polycarbonate

Guidelines for plastic 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 >±0.015 Dependent on part geometry, setup. 5-axis offers tighter tolerances and better repeatability. Plastic parts are measured at ambient room temperature.
Turning >±0.02+ mm High-precision turning across billet and bar work, supported by modern multi-axis machines.
Geometric Tolerances >±0.005+ mm* *Depending on material, finishes, and the geometry of the part.
CMM Measurement Verification to ±0.002 mm Achieved using our Axiom Too CMM with 2.3µm volumetric accuracy and temperature compensation.
Tab three

Finishing Process Purpose Additional Information
Vapour Polishing Improves the surface clarity and smoothness of plastic parts by reflowing the surface using solvent vapour. Commonly used on polycarbonate and acrylic components to restore transparency and achieve a gloss finish. Ideal for optical, display, or fluid-handling applications.
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

Plastic 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

Mazak Quick Turn 200MY

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

Doosan Puma 2600SY

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: 1100 mm
Max billet dia: Ø270 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: 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 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 600 4AX

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

Bridgeport VMC 500

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

Common industry applications

Electronics & computing

Electronics & computing

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Pharmaceutical & medical

Pharmaceutical & medical

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Defence & Military

Defence & Military

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Food processing & packaging

Food processing & packaging

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Automotive & Transport

Automotive & Transport

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What our clients say

Leanne
Senior buyer at bicycle firm
We’ve worked with Penta on several complex projects, and their consistency and attention to detail have been second to none. The team is quick to respond and flexible.
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%.
Mark
Senior buyer at coffee brand
The quality of the plastic mouldings you machined were exceptional.
Philip
OEM
You have excellent staff that care about customers like us to keep our business.
Shana
Electronics & Industrial
A pleasure to deal with, friendly & precise.
Russell
Medical and Pharmaceutical & OEM
Customer service is always very professional with everything done to a great detail expertise. Final product is also to a very high standard.
Steve
Scientific and Technical
I have used Penta Precision for 4 years and have never had any issues with quality or the service we have received. I would have no hesitation in recommending them as a supplier of precision parts.
Martin
Defence & Electronics
Our first order was professionally executed to the required standard. Communication was good.
Ben
Aerospace & Industrial
Penta Precision delivered an excellent service with a standard turnaround. The work was of a sublime level and the level of communication right from the start was outstanding.
Robert
OEM
Prompt communications and willing to help
Nadiya
Medical and Pharmaceutical
Great service and communication
David
Aerospace
Overall excellent service, parts are delivered on time to an acceptable standard. Sales and quotation team are very responsive to our enquires.
James
Medical and Pharmaceutical
I've always been very happy with the performance, support and overall quality of service that Penta has provided over the years
Abi
Scientific and Technical
We have a positive long standing relationship with Penta Precision. They are always friendly and professional, and respond to any queries quickly and promptly. We trust both the quality and the capability of Penta when supplying us with product and hope our working relationship only continues to grow and develop.
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.

More about plastic CNC machining

Article

Medical plastics machining: Guide to choosing the right types

Plastics can be harder to machine than metals: they can be less forgiving. Machining plastics requires specialist expertise – the kind that comes only with years of experience. But that's just half the battle. Not every plastics machining specialist has the experience needed to meet the stringent requirements of medical equipment OEMs. Choosing the right machining partner for medical applications is vital to ensure quality, consistency, validated processes and traceability of materials.

Common questions