Carbon Fiber Composite Machining
Lightweight, high-strength parts for aerospace, automotive, and robotics applications. Precision machining of carbon fiber reinforced polymer (CFRP) composites.
Why Carbon Fiber Machining is Different
Carbon fiber reinforced polymer (CFRP) composites present unique machining challenges unlike metals or plastics. The combination of carbon fibers embedded in a polymer matrix creates anisotropic stock material properties — strength varies by fiber orientation. Conventional machining techniques cause delamination, fiber pull-out, and rapid tool wear.
Nelotiv facility uses diamond-coated and carbide tooling specifically designed for composite materials. Controlled feed rates and spindle speeds prevent heat buildup that damages the resin matrix. Advanced dust collection systems capture hazardous carbon fiber particles, ensuring safe working conditions and clean finished parts.
Carbon Fiber Material Types
Four stock forms we routinely machine. Selection governs fiber orientation, achievable tolerance, and edge behavior during routing and drilling.
Pre-Cured Sheets
FORM-AFactory-cured flat panels with balanced 0°/90° weave. Uniform thickness, predictable chip load, and the most stable substrate for contour routing. Our default stock for 2D parts and drilled plates.
- Thickness
- 0.5 – 10 mm
- Panel size
- 500×500 mm +
- Tolerance
- ±0.05 mm
- Surface
- Gloss / Matte / Twill
- ›Diamond-coated upcut for clean top edge
- ›Backup board prevents bottom delamination
- ›Tab fixation for thin-gauge parts <1.5 mm
CFRP Tubes
FORM-BPultruded and roll-wound tubes with directional stiffness. The highest stiffness-to-weight form factor in our library; ideal for slender structural members where bending and torsional rigidity dominate the design.
- OD
- 10 – 100 mm
- Wall
- 1 – 5 mm
- Length
- Up to 2000 mm
- Profile
- Round / Square / Custom
- ›Mandrel support prevents ovality on thin walls
- ›Through-coolant drills for hole depth >2×D
- ›End-machining with live center to suppress chatter
Custom Layups
FORM-CPly-by-ply engineered layups with fiber orientation matched to the load path. Used when off-the-shelf stock cannot deliver the required directional stiffness or weight budget. We partner with certified layup facilities; post-cure machining is performed in-house.
- Fiber class
- Std / IM / HM
- Resin
- Epoxy / Polyester
- Orientation
- Per load case
- Cure
- Autoclave / Oven
- ›Directional stiffness ratio > 4:1 required
- ›Multi-axial load envelope on a single part
- ›Weight budget locked below generic stock
Hybrid Composites
FORM-DCarbon fiber interleaved with glass or aramid plies. The CF plies carry stiffness; the secondary fiber controls cost, impact tolerance, and fail-safe behavior. Useful where carbon's brittle fracture mode is a design concern.
- CF / GF
- Stiff + impact
- CF / Aramid
- Stiff + ductile
- Cost band
- 30–50% below pure CF
- Density
- 1.6 – 1.8 g/cm³
- ›Marine structures with impact exposure
- ›Sporting goods subject to off-axis loads
- ›Cost-sensitive enclosures with stiffness demand
All forms machineable in-house. Fiber orientation diagrams are CSS-rendered schematics, not photographs. Tolerance bands assume parameters within our standard process window; contact engineering for tight-tolerance review.
CFRP Machining Capabilities
Select a capability to see details. Specialized processes for composite materials.
Precision Profiling
CNC routing and profiling of carbon fiber sheets into complex 2D shapes. Diamond-coated router bits prevent fiber pull-out and help maintain clean edges. We machine parts up to 1000×500mm from sheet thicknesses 0.5mm to 10mm.
Drilling & Milling
Specialized brad point drills and diamond-coated end mills prevent fiber damage. Peck drilling cycles reduce heat buildup. Hole sizes from 2mm diameter. Precision hole drilling and pocket milling in CFRP without delamination.
Surface Finishing
Edge sealing prevents moisture ingress and fiber fraying. Surface sanding creates optimal bonding surfaces. Primer application available for paint systems. Post-machining surface preparation for bonding and coating.
Carbon Fiber Material Properties
| Property | Standard CFRP | Intermediate Modulus | High Modulus |
|---|---|---|---|
| Tensile Strength | 500-700 MPa | 700-1000 MPa | 1000-1500 MPa |
| Modulus of Elasticity | 70-80 GPa | 150-200 GPa | 200-250 GPa |
| Density | 1.5-1.6 g/cm³ | 1.5-1.6 g/cm³ | 1.6-1.7 g/cm³ |
| Max Service Temperature | 120°C | 150°C | 180°C |
| Machining Tolerance | ±0.08mm | ±0.05mm | ±0.05mm |
Industries & Applications
Where carbon fiber earns its place. Each row pairs the engineering driver with the CFRP property that delivers it, so design intent maps to material choice.
Carbon fiber is specified when specific stiffness (E/ρ) or specific strength (σ/ρ) must exceed what metals offer. Below: the property each industry exploits, and the part class we machine to deliver it.
CFRP Machining Process
Material Selection
Verify fiber orientation and resin system match application requirements. Choose appropriate CFRP type — sheet, tube, or custom layup.
Tooling Setup
Select diamond-coated or carbide tools based on stock material thickness and fiber type. Configure spindle speeds and feed rates to prevent delamination.
CNC Machining
Dust collection systems capture hazardous particles. Monitor for fiber damage or delamination. Execute profiling, drilling, and milling operations.
Finishing & QC
Surface preparation for bonding or coating. CMM inspection verifies dimensions. Visual inspection for fiber damage. Edge sealing prevents moisture ingress.
Why Choose Nelotiv for Carbon Fiber
Composite Material Expertise
We understand fiber orientation effects, delamination prevention, and proper tool selection for different composite types. Specialized experience in CFRP machining.
No MOQ — Prototype to Production
Whether you need one prototype part or production volumes, we deliver consistent quality and precision. Single-piece orders welcome.
Verified Quality Control
ISO 9001:2015 certified quality system. Full stock material traceability available. CMM inspection verifies dimensions. Visual inspection for fiber damage and delamination.
Carbon Fiber Machining FAQ
Start Your Carbon Fiber CNC Project
Upload STEP files for composite-specific DFM review. Nelotiv engineers assess fiber orientation requirements and recommend optimal CFRP selection.