The new-found interest in plastic as a substitute for metals is a result of the machinability of plastics. With the help of CNC machining, plastics can be cut across easily, and accurately as needed.
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This article discussed the emergence of plastic machining, its importance, and the simple-yet-complex process. Additionally, we will expose you to the benefits of plastics CNC machining compared to usual 3D prototyping.
Plastics CNC machining entails numerous processes, and the use of machines to yield different plastic molds or designs. These processes can differ for different plastic types or be altered to produce custom plastic designs.
Plastic CNC machining is a process that involves feeding huge formless blocks of plastics into a machine (which is often robot or computer-controlled) to create unique plastic designs, parts, or components.
This machine is so versatile that it can work on almost all kinds of plastics ranging from acrylic, polycarbonate, nylon, and PTFE.
The working mechanism of plastic machining is straightforward. It involves creating a CAD drawing of the product and setting up the machine to run the design.
Then, you simply select an appropriate plastic machining method and supply the CNC machine with formless plastic materials. The machine then produces the product according to the CAD drawing description.
Hence, the plastic machining process begins with a block of plastic brick. This solid plastic brick is reformed into a functional product when it is placed inside the machine. The CNC machine does this by passing it through one of the three CNC procedures (which is turning, milling, and drilling.)
The use of plastic CNC machining technology is highly beneficial for making plastic goods. It provides a quicker way to refine plastic products. Below are the advantages of CNC machining.
Plastics CNC machining has a faster tooling lead time than injection molding. What this means is that the time it will take to produce one tool from start to finish with CNC machining is shorter than the time it will take to produce that same tool with injection molding.
If your aim is to produce a few numbers of parts, CNC machining will be a faster way to get it done.
Plastics CNC machining is unarguably the best method for making plastic products with tight tolerance. Its complex processes allow for the creation of plastic products, such as machine compartments and aerospace body parts, that are highly accurate and precise in size.
Making numerous tiny plastic parts can cost a lot, take lots of time, and also waste tons of plastic materials if done with. Companies looking for a cost-effective way to produce miniature plastic parts can use plastic machining as it can help cut costs and prevent wastage.
Plastics can be machined to suit different industries’ needs of plastic. The CNC-machined plastic parts are used to produce consumer electronics, aerospace parts, medical appliances, and automotive components.
Plastics are important raw materials in industries that manufacture electrical and electronic appliances for obvious reasons. One, they are excellent insulators. Two, they are easy to mold into whatever design. Some of the electronic appliances and gadgets we use at home are produced with CNC plastic machining.
Machinable plastics are in great demand because of their use in the consumer goods market, particularly in consumer electronics. They are the perfect materials for complex designs. Machinable plastics are often used in the production of computers, televisions, cell phones, and many other household gadgets.
Aerospace industries are constantly evolving in their choice of material. They keep looking for ways to go lighter and they achieve this by using light, durable, and strong materials. Plastic is one of the major materials used in bulk in the aerospace industry.
The aerospace industry requires a high level of precision when constructing any component of the aircraft. This is why machinable plastic is of great benefit to the aerospace industry.
Also, the flexibility and ease of molding the machinable plastic will allow engineers in this industry to explore innovative ways of getting things done. Some examples of machinable aerospace components include engine mounts, airplane sit mounts, landing gear components, gaskets, and a lot more.
A lot of equipment used in the medical industry is made from plastics. Laboratory equipment, implants, prosthetics, and even surgical equipment and much more are made with plastics that are easy to machine.
These plastics are properly selected and have high tensile strength, and durability, and should be safe for human contact. Machinable plastics allow easy production and customization of medical equipment.
Fast cars, saloons, SUVs RVs motorbikes, and all other automobiles depend to a large extent on machinable plastics. Plastics are used because of their lightweight, strength, durability, and versatility.
Machinable plastics are used in the automotive industry to produce automotive exterior and interior parts that promote the aesthetics of the automobile. Some of the parts include bumpers, grilles, and interior trim. They can also be used to make unique custom parts, replacement parts, dashboard panels, and gas gauges.
Plastic machining is not always the most suitable production process for every plastic product. So when can it be used? Which conditions certify the application of plastic CNC machining? All these questions will be answered below.
At the testing stage, the product is designed and a small number is produced to see if it is properly made, or if it can serve the intended purpose perfectly.
It’s mentioned earlier that plastic CNC machining is faster when produced in small batches. This is why this process should be chosen during the testing stage. Adjustments can be easily made to products until the testers are satisfied with the quality of the product manufactured.
Perhaps, your desired design has a complex or superior surface finish that cannot be produced accurately by other prototyping or modeling processes. In that situation, plastic machining is the way to go. As long as you input the right design code, you are assured of receiving the right design products.
Plastic machining can be helpful to make a superior finish because it helps produce an accurate result if done properly. However, it allows the use of bead blasting for a smoother finish. Bead blasting is the use of compressed air on the surface of the machined plastic to correct any defects or scratches that might be caused during the production process.
In this case, where tight tolerance is needed, you should be thinking of producing all the products with plastic CNC machining. This will allow you to be very accurate and precise in manufacturing the product, whereas some other design methods might not be able to keep up with the accuracy that is needed.
CNC machining has a way of helping to achieve products that seem impossible. It gives a versatile approach to special material requirements, especially those that are not easily fabricated with other means. CNC is suitable for processing many plastic polymers.
One way to save production costs and maximize profit is by using CNC machining for the production of plastic products.
The setup cost of a CNC machine for a medium-sized project is low compared to injection molding. If the production will be done in small batches, it will be more economical to use the CNC machine in the production.
The following factors should be considered before deciding to choose plastic for plastic machining: strength of the plastic material, thermal properties, chemical reactivity, and physical appearance.
Plastic machining is a rigorous process so it is good to make sure that the plastic block selected is strong enough to handle the rigorous process. Also, the strength of the material should be compared with the strength requirement of the machined part to be produced.
The CNC machining process generates some heat that can affect the plastic if care is not taken. This is why it is good to first ensure that the melting temperature of the plastic chosen should be more than the temperature generated during the machining process.
Also, all the thermal properties such as thermal conductivity, thermal expansion, and heat resistance of the plastic should be carefully considered because the selected plastic material determines the thermal property of the plastic component that will be produced.
Some polymers react with other elements when exposed to certain conditions like moisture, UV light, coolant, and some additives. All these should be taken into consideration. If you don’t want this for your product, select the less reactive material.
How you want your plastic to look depends to a large extent on the materials you choose. Some polymers can only give your product a solid or translucent finish, some can give you a transparent product, some will have a rough finish, and some can give you a smooth finish.
Whatever physical appearance you intend to give your machined plastic part depends on your choice of plastic.
We’ve compiled a list of 10 machinable plastics to help you narrow down your search for the right plastic polymer for your next product.
Looking at the properties of PTFE, one would think this plastic cannot be machined. PTFE is a softer material when compared with other machinable materials. Its tendency to deform when it undergoes stress has caused some speculations that this plastic material might not be suitable for machining.
However, PTFE is very machinable, it has a low friction property, a high thermal conductivity, is resistant to chemicals, and has a high-temperature stability. These properties allow PTFE compounds to be easily machined into PTFE tubes, rods, films and sheets by CNC milling or turning machines.
There is no doubt about the machinability of PEEK. PEEK is an excellent machinable plastic. It has a low coefficient of thermal friction which increases its stability during the machining process. There will be ‘little to no’ dimensional change under a stable machining condition.
ABS is another relatively soft material that can be machined. Although it can experience some level of flexing and deformation during machining, it is machinable.
To machine ABS material without any hassle, the CNC machine should be set up in a way that vibration will be minimized. In addition, a proper cooling system should be in place to prevent deformation from the heat generated from machining.
Nylon is suitable for CNC machining under a controlled system of machining, nylon is a great machining material. It is a silk-like thermoplastic that can be easily heated, cut, or compressed into different parts. Nylons have a low absorption rate and thus cannot absorb moisture from the environment during the CNC machining process.
It is suitable for manufacturing wear-resistant products, gaskets, and washers.
Polyoxymethylene (POM) is used to make mechanical and automotive parts that would traditionally be made of metal. It is extremely rigid, long-lasting, and strong, possessing features similar to metals. It is highly acidic and should not come in contact with nitric acid and hydrochloric acid.
Polyoxymethylene (POM) is used in making ball bearings, fasteners, knife handles, and automotive gears.
Acrylic has a high tensile strength and thermal stability. It is an excellent machinable material used in various applications. They are mostly used for products that are transparent or that need light to pass through them. It can be used to produce road signages, lighting fixtures, and optical components.
Although PMMA is machinable, they are sensitive to heat. This is why a good cooling system should be in place during CNC machining.
PP has good impact resistance, chemical resistance, and low density. This property makes it quite easy to machine PPs. PP has a wide application in many industries that rely on plastics. They are used in the automotive industries, aerospace industries, and for the manufacturing of a lot of consumer goods.
PP has a lower melting point compared with other thermoplastics. The heating speed can be controlled by using a lower cutting speed and providing a cooling system during CNC machining.
Polycarbonate is a thermoplastic that is heat-resistant by nature, yet durable and efficient. Components produced with PC usually have a smooth finish. Although sometimes marks from machining might be left to the material.
To prevent scratches and marks during CNC machining, some conditions have to be met. This includes using the right feed rate, using the appropriate temperature, and using sharp cutting tools.
HDPE is a flexible, easy-to-process plastic that’s resistant to stress cracking, chemicals, and corrosives even at low temperatures. However, this material has poor UV resistance and is commonly used in the production of plugs, seals, and electrical insulators.
HDPE is used for CNC machining because of all the above properties. They can be easily processed into complex components. HDPE has enough structural stability that allows it to withstand all the rigorous processes of all the CNC machining methods without damage in the process.
UHMW is a strong, adaptable, and incredibly machinable plastic with great resistance to abrasion and wear. However, UHMW shouldn’t be utilized in temperatures beyond 80 to 100°C and isn’t recommended for high-load applications due to its high creep susceptibility.
It is used to produce truck bed liners, components of food processing machines, wear strips, and maritime dock fender pads.
Although UHMW is not suitable for high-temperature CNC machining, it can be machined at a relatively low temperature with the CNC turning method.
CNC material machining has made amazing strides in recent years and we will give you a thorough guide to choosing the three best CNC machining techniques. Below are some popular CNC machining techniques:
CNC turning consists of a fixed tool to remove extra material from a revolving workpiece that is attached to a lathe. CNC turning is most suitable when a lot of parts or pieces are needed.
Spheres and cones are the two most used cylindrical shapes in CNC turning. Some turning centers contain both a main spindle and a sub-spindle for even faster operation.
For multiple spindle turning centers, the workpiece is controlled by the main spindle. This is before it is transferred to the sub-spindle to finish the task on the opposite side of the machine. CNC turning is used in producing complex short-run manufacturing parts and precision components and parts.
The CNC milling process also makes use of mill machines or mills, which are CNC-enabled milling equipment that can be oriented either horizontally or vertically. In this method, materials are chopped and shaped using spinning tools with several points, allowing for thousands of RPMs per minute for rotational speed.
Three-axis motions are possible in basic mills, while more complex models can accommodate more axes. There are several types of milling machines. They are; hand, plain, universal, and universal mills.
Processing plastics using CNC milling starts with designing the product with CAD software. After the design is properly done, appropriate sharp cutting tools will then be installed on the CNC milling machine for easy cutting of the material. Also, a big block of the chosen plastic material will be mounted on the machine.
If you compare drilling to other plastic machining methods you will see that it is a rather cheap and simple operation. It creates cylindrical holes in the workpiece by using its rotating drill bits.
The design of the drill bit enables the waste metal, or chips, to detach from the workpiece easily. These drill bits come in different varieties and they all have different tasks they can perform.
Some of the different types of drill bits are spotting drills, peck drills, and screw machine drills. They can create a variety of holes because they can hold numerous drill bits. Without a tool turret to change drill bits as needed, the application might be restricted and drilling can become difficult.
Are you looking to bring your product to life, DCW is ready to do justice to that with our exceptional CNC machining. Our state-of-the-art plastic CNC machining services can give you just what you need without stress. DCW is ready to take over the product production process for your business.
At DCW, we boast of being among the top 3 PTFE plastics experts in China. Our list of services includes PEEK Bottles, PTFE caps, and other specialty plastic items (including seals, bellows, and other components.)
The company is the world’s best cnc machining plastic parts supplier supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.
We use unique technologies like DCW’s Premium PTFE Compression Molding, Automatic Production, CNC Lathe Machining, and CNC Machining. We also offer Stamping and Fast Turnaround Machining to our clients.
Our high-speed, precise auto machine produces machined plastic parts. Our products feature a maximum diameter of 25 mm so that they work well for milling tiny, precise pieces.
We make plastic tools with close-tolerance precision. This is done by our experienced engineers who use cutting-edge CAD/CAM software to make unique plastic prototypes.
Our high precision plastics machining products include bellows, ball valve seats, O-rings, insulators, guide rings, labwares, seals, and bushings.
Plastic CNC machining has great benefits for different industries. Complex designs can be brought to life with CNC machining as long as the right machinable plastic is used. Although CNC offers a faster way of producing prototypes, you would still have to consider some factors before choosing CNC machining.
If you are still not sure if you need CNC machining done for your product, or you are confused about the material to choose. DCW will always be available to enlighten you. DCW offers one of the best CNC machining services for all industries. Whatever you need, we can produce. Contact us today to get a quote.
Precision can make or break a product. Whether you're developing aerospace components, surgical tools, or tight-tolerance industrial parts, choosing the right CNC machining company isn’t just about getting a quote, it’s about getting it right the first time.
Too often, companies go with the lowest bidder and end up dealing with dimensional inaccuracies, missed lead times, or poor surface finishes, issues that can derail production and kill budgets. In this guide, we break down the 10 most critical factors to consider when selecting a precision CNC machining service, especially if you're sourcing custom or complex parts.
Not all CNC machining companies are created equal. Some specialize in basic milling or prototyping, while others have advanced capabilities like 5-axis machining, Swiss turning, or EDM. You want a shop that understands tight tolerances, complex geometries, and repeatable quality.
Ask:
● What’s the minimum tolerance they consistently hold?
● Do they have case studies or parts they’ve produced in aerospace, medical, or defense sectors?
Tip: Look for services that advertise tolerance capabilities within ±0.005mm or better.
A good CNC machining service should be proficient in a wide range of materials, especially if you're machining exotic alloys or non-standard materials.
Common materials to ask about:
● Metals: Aluminum, stainless steel, brass, copper, titanium, Inconel
● Plastics: PEEK, Delrin (acetal), nylon, PTFE, UHMW
● Composites or specialty materials
If you're working with heat-resistant, high-strength, or corrosion-resistant components, their material experience matters.
The types of CNC machines a company owns say a lot about their range and quality.
● 3-axis CNC mills: Basic precision
● 5-axis CNC machines: Complex curves, one-pass machining
● CNC lathes: Cylindrical parts, turned features
● Swiss machines: Ultra-precise small parts
● EDM: Intricate cavities, hardened steel work
A strong CNC company invests in modern, diverse machinery with automated tool changers and inspection systems.
No matter how advanced the machines, quality assurance is where reliable CNC machining companies stand apart.
Look for:
● CMM (Coordinate Measuring Machine) inspections
● ISO or AS certification
● In-process and final dimensional reports
● Surface finish verification (Ra values)
If a shop doesn't talk about metrology, that's a red flag.
A great custom CNC machining service doesn’t just ask for a STEP file, they ask questions.
They should support:
● DFM (Design for Manufacturability) feedback
● Iterative prototyping
● Flexible low-volume runs
● Changes on the fly if the part evolves
This is especially important for startups, R&D teams, or anyone developing new mechanical products.
Time matters, especially in prototyping or high-speed product cycles.
An online CNC machining service should be upfront about:
● Typical lead times for prototypes vs. production
● Rush job availability
● How they handle unforeseen delays or material shortages
Some of the best CNC machining services offer 3 - 7 day turnaround on low-volume aluminum or plastic parts.
A CNC shop should grow with your project. Can they scale from 10 parts to 10,000 without retooling delays or outsourcing?
Ask:
● Do they do production runs in-house or through a partner network?
● What’s their daily part capacity or machine availability?
● Can they support blanket orders or scheduled deliveries?
You should never feel like you're talking to a black box.
● Do they offer real-time order updates?
● Can you talk directly with engineers, not just sales reps?
● Do they give clear, honest feedback on manufacturability?
Strong communication leads to fewer errors, better parts, and lower costs over time.
Modern CNC machining companies offer online instant quotes, material options, and tolerance spec input right on their platform.
Look for platforms that let you upload CAD files, set tolerances, pick finishes, and compare pricing instantly.
It saves time, reduces miscommunication, and makes sourcing parts easier, even across time zones.
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Finally, check what others are saying.
● Do they have Google reviews, case studies, or testimonials?
● Are they used by industries where failure isn't an option, like aerospace, automotive, or robotics?
A track record of on-time delivery, consistent tolerances, and supportive customer service is the ultimate proof.
Summary: Comparison Table
FactorWhat to Look ForPrecision Capability±0.005mm or betterMaterial RangeFrom aluminum to titanium, PEEK, and compositesMachine Types3-axis, 5-axis, lathe, Swiss, EDMQC & CertificationsCMM, ISO /AS, full inspection reportsCustomization SupportDFM guidance, quick iterations, low-volume runsLead Time3 - 7 days for small batches, clear rush policiesScalabilityPrototype to production without outsourcingCommunicationEngineer contact, responsive project updatesOnline ToolsInstant quotes, CAD uploads, tolerance selectionReputationTestimonials, reviews, industry trustA mid-sized robotics team was preparing for a product demo. They needed 30 precision-milled aluminum linkages with ±0.01mm tolerance for a robotic arm assembly. Their regular vendor couldn’t guarantee tolerances tighter than ±0.05mm, and the few prints they received were just slightly off… but enough to cause alignment issues in the joints.
That’s when they turned to JLCCNC’s precision CNC service.
The result? Fully spec-compliant parts, delivered in 6 days, with inspection reports included. The demo worked flawlessly, and they’ve been outsourcing their entire aluminum arm assembly to JLCNC ever since.
Precision doesn’t just meet specs, it builds trust when it matters most.
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Don’t gamble on low-cost providers if precision, delivery, and accountability are critical to your part’s performance. Choose a CNC machining company that brings technical expertise, real support, and machining power you can count on.
Ready to move past sourcing headaches and get flawless parts, every time?
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