Custom CNC Plastic Parts
Precision Machining Services for Engineering Plastic Components
| Tolerance | Minimum Order | Materials | Lead Time | Quality Cert |
|---|---|---|---|---|
| ±0.01mm | 1 Piece | 15+ Grades | 7-15 Days | ISO 13485 |
CNC plastic machining is a precision subtractive manufacturing process that cuts solid engineering plastic stock into custom components using computer-controlled tools. This method delivers exceptional accuracy for low-to-medium volume production, enabling complex geometries and tight tolerances without the high cost of injection molding tooling, making it ideal for prototypes, custom parts, and low-volume production runs.
Our CNC Plastic Machining Capabilities
As a national high-tech enterprise with 26 years of precision manufacturing experience, Xiamen Goldcattle specializes in custom engineering plastic machining for global clients. Our dedicated plastic processing team averages 10+ years of experience, delivering consistent quality for medical, semiconductor, and automation projects.
Our Hardware & Processing Strength
- 12+ 3/4/5-axis CNC machining centers, dedicated to plastic component processing
- Low-temperature cutting systems to prevent material deformation during processing
- Full in-house quality lab with precision measurement equipment for 100% part inspection
- End-to-end production, from 1-piece prototypes to 100,000+ units annual production
What We Can Achieve
- Consistent ±0.01mm tolerance for critical plastic components, meeting strict application requirements
- Full processing capability for all common engineering plastics, with proven process parameters
- 100% raw material traceability, with material certificates and inspection reports for every batch
- Compliance with ISO 9001, ISO 13485, and RoHS standards for medical and industrial projects
Problems We Solve For You
- Complex plastic geometries that general shops can’t process with the required precision
- Long lead times for custom plastic parts, we deliver prototypes in as fast as 3 days
- Strict material and compliance requirements for medical and semiconductor clients
- High costs for low-volume production, our optimized processes reduce costs by 30% compared to domestic suppliers
Engineering Plastics We Machine
| Material | Key Properties | Typical Applications |
|---|---|---|
| PEEK | High temp resistance, biocompatible, high strength | Medical implants, semiconductor components |
| Delrin (POM) | Low friction, high stiffness, excellent dimensional stability | Gears, bearings, automation parts |
| PTFE (Teflon) | Chemical resistance, non-stick, low friction | Seals, gaskets, chemical industry parts |
| Nylon (PA6/PA66) | High wear resistance, good impact strength | Gears, structural parts, bushings |
| ABS | Good impact resistance, easy to machine, low cost | Housings, prototypes, enclosures |
| UHMWPE | Extreme wear resistance, self-lubricating | Conveyor parts, wear strips, liners |
We also support custom specialty materials upon request, with full material validation to ensure they meet your project requirements.
CNC Machining vs. Plastic Injection Molding
| Factor | CNC Machining | Injection Molding |
|---|---|---|
| Tooling Cost | $0, no custom tooling required | $5,000-$50,000 for custom molds |
| Lead Time | 3-10 days, start production immediately | 4-6 weeks for tooling, then production |
| Ideal Volume | 1-10,000 units, prototypes & small runs | 10,000+ units, mass production |
| Design Flexibility | Full flexibility, easy to modify designs mid-project | Fixed once tooling is made, changes are expensive |
| Material Options | Wide range, including specialty engineering grades | Limited to common molding-grade materials |
Can Engineering Plastics Replace Metal Parts?
In many applications, high-performance engineering plastics can successfully replace metal components, delivering significant benefits while maintaining or even improving performance:
Weight Reduction
Plastics are 4-6 times lighter than steel and 2-3 times lighter than aluminum, reducing overall system weight and improving energy efficiency. For example, PEEK has 1/5th the weight of stainless steel while retaining 80% of its strength.
Corrosion Resistance
Engineering plastics are naturally resistant to chemicals and corrosion, eliminating the need for expensive coatings or plating. This makes them ideal for chemical processing and marine applications.
Noise & Vibration Damping
Plastics have excellent damping properties, reducing noise and vibration in moving parts. This is particularly valuable in automation and robotics applications, where quiet operation is critical.
Cost Efficiency
Plastic components often cost less to produce than equivalent metal parts, especially for low-to-medium volumes. They also require less post-processing, reducing overall project costs.
Common replacement examples include: PEEK replacing aluminum in medical and aerospace parts, Delrin replacing brass in bearings and gears, and UHMWPE replacing steel in wear components.
Industries & Applications
Medical Devices
- Surgical instrument components
- PEEK medical fixtures
- Diagnostic equipment parts
Semiconductor
- Wafer handling components
- Insulator parts
- Equipment structural parts
Automation & Robotics
- Custom gears & bearings
- End-of-arm tooling
- Lightweight structural parts
Industrial
- Conveyor system parts
- Seals & gaskets
- Custom machine components
Challenges in CNC Plastic Machining
| Challenge | Our Solution |
|---|---|
| Thermal expansion & part deformation | Low-temperature coolant delivery, dynamic speed adjustment, and specialized fixturing to maintain part stability during cutting. Parametric note: We maintain cutting temperature within ±2°C of target |
| Burr formation on edges | Sharp, specialized plastic-cutting tools, plus automated deburring processes to ensure clean, burr-free edges. Process note: We use 2-flute end mills optimized for plastic |
| Thin wall deflection during cutting | Custom support fixtures and low-force adaptive machining to eliminate part movement and deformation. Capability: We can machine walls as thin as 0.3mm |
| Moisture absorption affecting dimensions | Pre-drying of hygroscopic materials, plus controlled environment storage to ensure dimensional stability. Material note: Critical for Nylon and PEEK materials |
Case Studies
PEEK Medical Imaging Fixture
Challenge: A medical device client needed a custom fixture for CT imaging, requiring biocompatible material with low X-ray absorption, and tight ±0.02mm profile tolerance.
Our Solution: We machined the component from medical-grade PEEK, using our specialized low-temperature cutting process to prevent material degradation, plus full 3D inspection to validate the profile.
Result: Delivered 12 custom parts in 7 days, achieved ±0.015mm tolerance, passed all ISO 13485 compliance requirements, and reduced the client’s cost by 35% compared to their previous US supplier.
Delrin Automation Gear Assembly
Challenge: An automation client needed a set of custom Delrin gears for a high-speed conveyor system, requiring low friction, high wear resistance, and tight tooth profile tolerance.
Our Solution: We used our 4-axis CNC system to machine the gear teeth with a single setup, eliminating alignment errors, and applied a specialized polishing process to reduce surface roughness.
Result: Delivered 500 units in 10 days, achieved ±0.01mm tooth profile tolerance, the gears have now been running for 18 months without wear, exceeding the client’s performance expectations.
Frequently Asked Questions
What tolerance can you achieve for plastic CNC parts?
We can achieve standard tolerance of ±0.01mm for most plastic parts, with the ability to reach ±0.005mm for critical features with additional processing, depending on the material and part geometry.
What is the minimum order quantity?
There is no minimum order quantity. We support orders from 1-piece prototypes up to 100,000+ units annual production, working with clients across the full product lifecycle.
How long does it take to get custom plastic parts?
For prototype parts, we can deliver in as fast as 3 business days. For larger production orders, typical lead times are 7-10 business days, depending on part complexity and order volume.
Can you machine medical-grade plastics?
Yes, we specialize in medical-grade materials including USP Class VI PEEK, medical-grade Delrin, and other biocompatible plastics. We are ISO 13485 certified, ensuring full compliance with medical device requirements.
Do you offer post-processing for plastic parts?
Yes, we offer a full range of post-processing services including polishing, coating, annealing, bonding, and assembly to deliver fully finished parts ready for your application.
Can you work with my CAD files?
Absolutely. We support all common CAD formats including STEP, IGES, STL, SolidWorks, and CATIA files. Our engineering team will review your model and provide a free DFM review.
What’s the difference between CNC plastic and 3D printed plastic?
CNC machined plastic parts use solid, homogeneous material stock, delivering better strength, dimensional stability, and surface finish than 3D printed parts. It’s ideal for functional parts that require high performance, while 3D printing is better for very early prototypes.
Do you provide material certificates?
Yes, every order comes with full material traceability, including mill test reports, material certificates, and inspection reports as required, to meet your industry compliance needs.
Can you machine very thin walls in plastic?
Yes, with our specialized fixturing and low-force machining process, we can machine walls as thin as 0.3mm, depending on the material and part geometry, while maintaining dimensional stability.
Do you offer DFM reviews for plastic projects?
Yes, we provide complimentary Design for Manufacturability reviews for all plastic machining projects. Our engineers will analyze your design, identify potential issues, and provide recommendations to optimize cost and quality.
Start Your Plastic Machining Project
Ready to get started with your custom plastic parts project? Our engineering team offers complimentary Design for Manufacturability (DFM) reviews, helping you optimize your design for cost, quality, and performance. Upload your CAD files today to get a free, no-obligation review and quote.
