Custom Composite CNC Machining
FastPreci offers composite materials such as carbon fiber, fiberglass and polymers. Lightweight, strong and corrosion resistant, composites are ideal for industries such as aerospace, automotive, and electronics.
Our expertise in CNC carbon fiber machining ensures tight tolerances and surface finish, enabling the creation of superior quality custom carbon fiber parts that meet the demands of high performance applications.
Advantages of CNC Composite parts
High Strength-to-Weight Ratio
Composite materials such as carbon fiber and fiberglass offer exceptional mechanical strength while remaining lightweight, making them ideal for aerospace, automotive, and drone components.
Excellent Fatigue and Impact Resistance
CNC-machined composite parts can withstand repeated stress and sudden impacts without cracking or deforming, ensuring long-term durability in dynamic applications.
Corrosion and Moisture Resistance
Unlike metals, composite materials are inherently resistant to moisture, corrosion, and chemical degradation, enabling their use in marine, outdoor, and chemical processing environments.
Tailorable Properties
The layered structure of composites allows engineers to customize strength, stiffness, and thermal performance in specific directions—providing optimized functionality for each CNC-machined component.
Low Thermal Conductivity
Many composite materials act as thermal insulators, making them ideal for applications requiring heat resistance or thermal management, such as electronic housings and structural panels.
Design Flexibility and Complex Geometry
Composites are well-suited for CNC machining of intricate shapes and undercut features that may be difficult or cost-prohibitive to produce in metals, expanding design possibilities for advanced industries.
Common Composite CNC Machining Materials
Carbon fiber is a lightweight, high-strength composite material widely used in aerospace, automotive and electronics. It has high precision, corrosion resistance, thermal stability and good strength and rigidity, and is particularly suitable for precision parts, lightweight design and applications in high-temperature environments.
| Model | Density (g/cm³) | Tensile Strength | Tensile Modulus | Thermal Stability | Conductivity |
| T300 | 1.76 | 3500 | 230 | Medium | High |
| T700 | 1.8 | 4900 | 240 | High | High |
| T800 | 1.81 | 5880 | 294 | High | High |
| M40J | 1.78 | 4120 | 377 | High | Medium |
| IM7 | 1.8 | 5700 | 276 | High | Medium |
| HM | 1.85 | 2400 | 540 | High | Low |
Glass fiber (GFRP) is a high-strength, lightweight composite material with excellent corrosion resistance and electrical insulation, widely used in CNC machining. It is suitable for the manufacture of chemically resistant parts, electrical insulators and lightweight structural components. Due to its good hardness, toughness and processability, fiberglass is commonly used to produce structural parts and housings, especially with the support of reinforcing materials such as epoxy and phenolic resins, which provide higher impact resistance and thermal stability.
| Model | Density (g/cm³) | Tensile Strength （MPa） | Thermal Stability | Hardness | Insulation | Corrosion resistance |
| G10 | 1.80-1.90 | 150-220 | 130-180°C | High | Excellent | Strong |
| FR4 | 1.80-1.90 | 100-250 | 120-140°C | Medium | Good | Medium |
| G11 | 1.80-1.90 | 200-250 | 150-180°C | High | Excellent | Strong |
| CEM-1 | 1.80-1.90 | 100-150 | 100-130°C | Medium | Average | Medium |
| CEM-3 | 1.80-1.90 | 120-200 | 110-130°C | Medium | Good | Medium |
Polymer Matrix Composites (PMCs) are lightweight, high-strength materials made from polymer matrices, often reinforced with fibers like carbon, glass, or Kevlar. Known for their excellent corrosion resistance, thermal stability, and mechanical strength, PMCs are ideal for manufacturing high-performance components. Their low density reduces part weight, while maintaining structural stability and impact resistance, making them popular in aerospace, automotive, sports, and medical industries.
| Material Type | Density (g/cm³) Tensile | Strength (MPa) | Modulus of Elasticity (GPa) | Heat resistance |
| Carbon Fiber Reinforced Polymer (CFRP) | 1.5-2.0 | ~3500 | 230-450 | High |
| Glass Fiber Reinforced Polymer (GFRP) | ~1.9 | ~1000 | 70 | High |
| Kevlar (Aramid) Reinforced Polymer (AFRP) | ~1.4 | ~3000 | 130 | Medium |
| Natural Fiber Reinforced Composites | 1.0-1.5 | 100-300 | 10-20 | Low |
| High Performance Polymer Matrix Composites | 1.3-1.6 | 200-400 | 20-50 | High |
Composite CNC Machining Tolerances
CNC machining of composite components requires a careful balance between precision and material integrity. For materials like carbon fiber reinforced polymers (CFRP) or glass fiber composites, we optimize our machining processes to minimize delamination, fiber pull-out, and edge fraying while achieving functional accuracy. By utilizing specialized tooling, controlled feed rates, and vacuum fixturing, we consistently deliver precise tolerances on critical features such as mating surfaces, mounting holes, and alignment points.
| Standard Tolerance | Tight Tolerance | |
| Dimension | ±0.10 mm | ±0.05 mm |
| Hole Diameter | ±0.08 mm | ±0.03 mm |
| Flatness (100 mm) | 0.10 mm | 0.05 mm |
| Parallelism | 0.10 mm | 0.05 mm |
| Perpendicularity | 0.15 mm | 0.07 mm |
| Roughness | Ra 6.3 μm | Ra 1.6 μm |
| Concentricity | ±0.10 mm | ±0.05 mm |
Composite CNC Machining for Various Industries
Aerospace
Drone frames, interior panels, satellite brackets, radome components.
Automotive
Body panels, battery enclosures, aerodynamic parts, lightweight mounts.
Industrial Equipment
Robot arms, structural supports, machine covers, anti-vibration plates.
Electronics
EMI shielding housings, non-metallic PCB holders, antenna supports.
Medical
Imaging system frames, MRI-compatible mounts, rehabilitation components.
Consumer & Sports
Carbon fiber bike parts, drone chassis, protective gear, performance accessories.
Custom Composite Parts Finishing Options
We provide an array of surface finishing solutions meticulously crafted for CNC-machined composite components. Our finishing services are engineered to cater to objectives such as enhanced bonding, superior aesthetics, and refined dimensional precision, all while ensuring the preservation of the structural integrity inherent to composite materials.
| Finishing Option | Description | Typical Applications |
| Edge Sealing & Resin Coating | Applies a protective resin to cut edges to prevent fiber fraying, delamination, and moisture ingress. | Aerospace panels, structural CFRP parts |
| Precision Trimming & Deburring | CNC finishing process to remove burrs, smooth edges, and ensure geometric consistency. | Mounting features, enclosure panels |
| Surface Sanding & Micro-Milling | Reduces surface roughness and improves flatness without damaging fiber structure. | Aesthetic parts, interface layers |
| Paint & Coatings | Adds UV protection, color coding, or branding while protecting fiber surfaces. | Consumer electronics, industrial covers |
| Plasma or Flame Treatment | Enhances surface energy to improve bonding with adhesives or paints. | Pre-bonding, lamination prep |
| Laser Marking (Low Power) | Enables part identification and traceability without structurally damaging the composite. | Part numbers, QR codes, branding |
Custom Composite Parts Gallery
Why Choose FastPreci for Composite CNC Machining?
Fast
Composite CNC parts delivered as fast as 3–5 days, accelerating your product development and enabling rapid prototyping or short-turn production — even for lightweight, high-performance parts.
Precision
Expertise in handling fiber-reinforced materials with optimized feeds, toolpaths, and fixturing. Achieve tight tolerances on mating features and hole dimensions while minimizing fiber pull-out, delamination, and thermal distortion.
Cost-effective
We match the right machining strategy to your design and volume, avoiding over-engineering and excessive fiber damage. Combined with in-house production and scalable workflows, we deliver high-performance parts at competitive cost.
One-stop Solution
From multi-axis milling, contour trimming, edge sealing to surface sanding, resin coating, and painting, we support every step of your composite part lifecycle — from R&D to full-scale production.
Strict Quality Control
Our ISO 9001-certified system includes dimensional inspection, delamination checks, fiber exposure control, and visual surface verification to ensure consistent results — part after part.
Engineering Support
Our composite-savvy engineers offer material selection advice, DFM analysis for layered structures, fixturing strategies, and machining simulations — helping you avoid costly design errors and improve part performance.
Composite CNC Machining Knowledge
