Custom Composite CNC Machining

At Solnit, we specialize in precision CNC machining of advanced composite materials including carbon fiber, fiberglass, and high-performance polymers. These lightweight and durable materials are widely used in aerospace, automotive, medical, and electronics industries where strength, efficiency, and corrosion resistance are critical.

Our 5-axis CNC machining capabilities ensure superior accuracy, excellent surface finish, and tight tolerances, allowing us to manufacture complex geometries and custom composite parts tailored to your specific application needs.

Whether you require prototype development or full-scale production, our expertise guarantees consistent quality and reliable performance in every part we deliver.

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Custom CNC Machining for Carbon Fiber and Composites

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...

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	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.

Parameter	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 cater to enhanced bonding, aesthetics, and precision while preserving structural integrity.

Finishing Option	Description	Typical Applications
Edge Sealing & Resin Coating	Protective resin on cut edges prevents fraying, delamination, and moisture ingress.	Aerospace panels, structural CFRP parts
Precision Trimming & Deburring	CNC finishing to remove burrs, smooth edges, and ensure consistency.	Mounting features, enclosure panels
Surface Sanding & Micro-Milling	Improves flatness and reduces roughness without fiber damage.	Aesthetic parts, interface layers
Paint & Coatings	Adds UV protection, branding, or color coding while protecting fibers.	Consumer electronics, industrial covers
Plasma or Flame Treatment	Enhances surface energy to improve adhesive or paint bonding.	Pre-bonding, lamination prep
Laser Marking (Low Power)	Identification/traceability without damaging composites.	Part numbers, QR codes, branding