Usinage CNC de matières plastiques

Great Plastics specializes in high-performance plastics in sheets, round rods, tubes, and many more. Large volumes are in stock to meet different project requirements and specifications. With our extensive line of industrial plastics, our offerings include state-of-the-art CNC machining services.

Faster Lead Times

With instant quotes and rapid production, you can reduce cycle times by as much as 50%.

World-Class Machine Shops

Tap into a highly vetted and managed network of the best machine shops world-wide.

Flexible Pricing

Choose between fast and cost-effective options to find the best price.

Machining routes

CNC Machining Processes for Plastic Parts

Our shop has several CNC Turn / Milling Machines which are backed by years of experience in plastics & composites only CNC machining. We have the experience, personnel & technology to provide reliable supply of high quality CNC machined plastic & composite parts.

CNC milling natural PEEK block, white PEEK chips, 3-axis VMC machining high performance thermoplastic

Fraisage CNC

Suitable for plates, fixtures, manifolds, pockets, slots, blocks and flat parts machined from sheet or block stock.

Tournage CNC

Suitable for bushings, rollers, spacers, sleeves, rings and cylindrical parts machined from rod or tube.

Drilling & Threading

Suitable for holes, threaded plastic features, inserts and mounting patterns added to milled or turned parts.

Materials we machine

Engineering Plastic Materials for CNC Machining

Industry-leading companies in aerospace, automotive, defense, machinery, medical technology, robotics, electronics, oil & gas, industrial automation and more that require high degrees of detail and complexity come to us for rapid prototypes and production parts.

PEEK

Haute performance

Usiné pour des pièces soumises à des contraintes thermiques, chimiques et d'usure, ou pour lesquelles la résistance mécanique est essentielle : sièges de soupapes, manchons de roulements, entretoises électriques et composants structurels.

Haute température Résistant aux produits chimiques Usure et charge

PPS

Chimique et stable

Sélectionnés pour leur résistance chimique et leur stabilité dimensionnelle dans le domaine du traitement des fluides, notamment pour les composants de pompes et de vannes, tout en offrant un rapport qualité-prix optimal.

Résistant aux produits chimiques Stabilité dimensionnelle Tenant compte des coûts

PI

Haute température

Le polyimide est utilisé pour la fabrication de pièces devant résister à des charges et conserver leurs dimensions à des températures élevées et constantes, notamment les bagues, les joints d'étanchéité et les composants isolants.

Chaleur prolongée Portant Électricité

Î.-P.-É.

Électrique et raide

Le PEI allie isolation électrique, rigidité et résistance au feu, ce qui en fait un matériau idéal pour la fabrication de boîtiers, d'isolateurs, d'entretoises et de fixations de précision.

Isolation électrique Rigidité Comportement au feu

PAI

Utilisation extrême

Le PAI est évalué pour répondre aux exigences les plus élevées en matière de charge et de température parmi les thermoplastiques courants — pièces d'usure, bagues et composants d'étanchéité.

Charge extrême Haute température Résistance à l'usure

Vous ne savez pas quel plastique choisir ?

Envoyez-nous le dessin : nous vérifierons l'adéquation des matériaux lors de la revue technique.

Le choix des matériaux est validé avec vous avant l'établissement de tout devis.

Machining CHOOSE

When to use CNC Turn / Milling?

This process is ideal for parts that have both turning and milling steps, high part volume, complex geometries requiring multi-axis machining and tight tolerances.

With its multi-tasking capabilities, it requires only one machine set up and produces parts with faster cycle times when compared to utilizing a separate lathe and milling machine. Another advantage is eliminating multiple set-ups which can also introduce tolerance error.

Premium Surface

Premium Surface Finishing Services

The perfect surface finish can make the difference between a good part and an exceptional one. Our comprehensive finishing services go beyond standard deburring to provide aesthetic appeal, functional improvements, and enhanced performance characteristics tailored to your application.

Available Finishing Options:

Creates uniform matte texture for improved grip and reduced glare. Available in various media grades for different surface textures from fine satin to coarse matte.

Progressive sanding and buffing for high gloss finish on engineering plastics. Ideal for aesthetic components and parts requiring low friction surfaces.

Permanent part identification, serialization, logos, and instructional markings. High contrast marking on most plastic materials without surface damage.

Ra 0.05 μm

Optical Polish Available

100%

Edge Deburring Standard

10+

Finishing Methods

part size&tolerances

Maximum part size

There are several types of CNC milling machines, each with its own distinct maximum part size. 3-axis and 3+2 axis machines have the lowest start-up costs and can produce parts with relatively simple geometries.The more advanced of the milling machine family, 5-axis centers can produce parts with more complex geometries. These machines require fewer machine setups so they are more productive.

3-axis milling

Size Metric units Imperial units
plastics 1500 × 800 × 500 mm 59.0 × 31.4 × 27.5 in
Min. feature size Ø 0.50 mm Ø 0.019 in

3+2 axis milling

Size Metric units Imperial units
plastics 2000 × 1500 × 200 mm 78.7 × 59.0 × 7.8 in
Min. feature size Ø 0.50 mm Ø 0.019 in

5-axis milling

Size Metric units Imperial units
Max. part size for all materials 2000 × 1500 × 200 mm 78.7 × 59.0 × 7.8 in
Min. feature size Ø 0.50 mm Ø 0.019 in

CNC turning

Part size limitations Metric units Imperial units
Maximum part diameter 431 mm 17 in
Maximum part length 990 mm 39 in
Maximum swing over the carriage 350 mm 13.7 in
Maximum spindle through-hole 40 mm 1.5 in

*Maximum speed: 1700RPM, Motor power: 640W

CNC milling & turning tolerances

CNC milling

Limits for nominal size Plastics (ISO 2768-m)
0.5 mm* to 3 mm ±0.1 mm
Over 3 mm to 6 mm ±0.1 mm
Over 6 mm to 30 mm ±0.2 mm
Over 30 mm to 120 mm ±0.3 mm
Over 120 mm to 400 mm ±0.5 mm
Over 400 mm to 1000 mm ±0.8 mm
Over 1000 mm to 2000 mm ±1.2 mm
Over 2000 mm to 4000 mm ±2 mm

*Please clearly indicate tolerances for nominal sizes below 0.5 mm on your technical drawing.

CNC turning

Limits for nominal size Plastics (ISO 2768-m)
0.5 mm* to 3 mm ±0.1 mm
Over 3 mm to 6 mm ±0.1 mm
Over 6 mm to 30 mm ±0.2 mm
Over 30 mm to 120 mm ±0.3 mm
Over 120 mm to 400 mm ±0.5 mm
Over 400 mm to 1000 mm ±0.8 mm
Over 1000 mm to 2000 mm ±1.2 mm
Over 2000 mm to 4000 mm ±2 mm

*Please clearly indicate tolerances for nominal sizes below 0.5 mm on your technical drawing.

These are our standard tolerances. Should you require tighter custom tolerances, please contact us for details.

Quality & Inspection

We have high standards for CNC Machining

We manufacture custom parts to strict manufacturing standards, ensuring that every component and process meets your specified requirements.

  • Several surface finishes are available to improve the cosmetic quality of your parts after machining.
  • Every custom part gets checked on site by our manufacturing partners according to our guidelines.
  • Inspection reports and other types of quality documentation are available on request to assure the highest quality and compliance.

Questions des acheteurs

CNC Machining FAQs

Parts machined with plastics will follow 2768-m (medium). Geometric tolerances down to ± 0004 in. (0.010 mm) are possible but must be clearly indicated in technical drawings. We can achieve tighter tolerances on shafts with up to H7 fits with manual quoting and on occasion tighter.

A CNC Turning Center performs a turning type operation. CNC lathes, or turning centers, have tooling mounted on a turret which is computer-controlled. CNC Turning is a process in manufacturing where workpieces are rotated as various tools are used to remove material and create the desired shape.

CNC lathes are most often only 2 axis machines with one spindle. They also don’t have high production capabilities and typically don’t have a protective enclosure around the machine. CNC turning centers are more advanced versions of CNC lathes with up to 5 axes and more versatility in cutting ability. They also offer the ability to produce higher volumes and usually integrate milling, drilling, and other capabilities.

In addition to using turning tools, a CNC turning center can also be equipped with rotating cutters such as end mills or drills, which allows for greater freedom in machining, such as having the ability to handle asymmetrical features in parts. This increases production speed and efficiency, cost-effectiveness and safer operations. Several aspects of turning that are unique and different from milling, include the ease of achieving radial symmetry, high precision due to mounting part in chuck, and good surface finish.

If a specific fillet radius is required, please specify. If not, the fillet radii that allow for easy machining will be added based on the machinist’s discretion. For a general idea, internal vertical edge radii could be >1/3*Depth and internal horizontal edges may be left sharp or have a 0.5mm to 1mm radius.

Material selection depends on factors including:

Mechanical properties (strength, hardness and wear resistance)

Environmental conditions (temperature and corrosion)

Weight and cost requirements

Our platform provides instant quoting and DFM feedback, and our team can offer guidance regarding the best material for your application.

Need Custom CNC Plastic Parts Made to Your Drawing?

Share your drawing and operating requirements.

We’ll review the material, part geometry, and critical dimensions to help define the right machining approach.