What materials can a CNC router cut?

Answer

 

• Metals: Aluminum alloy, brass, low-carbon steel (typically <10mm thick);
• Non-metals: Wood, plastics (ABS, acrylic), composites (carbon fiber), stone, glass, foam;
• Special materials: PCB, rubber, leather.

Extended Response

I. Working Principle and Scope of CNC Routers

(1) Core Principle

• Controlled by a computer, a high-speed rotating tool (spindle speed usually 10,000–24,000rpm) moves along X, Y, Z axes for milling, cutting, and engraving.
• Difference from CNC machining centers: Lower spindle power (2–7.5kW), suitable for rapid processing of thin materials.

(2) Application Scenarios

• Thickness limit: Metals ≤10mm, non-metals ≤50mm;
• Precision range: Repeatability ±0.05mm, ideal for medium-precision parts (e.g., signage, furniture components);
• Efficiency advantage: Planar cutting speed up to 5–10m/min (material hardness-dependent).

II. Classified Materials and Characteristics

(1) Metals

 

• Processing tips:
  • Aluminum requires high speed (18,000–24,000rpm) and high feed (1,000–3,000mm/min) to avoid sticking;
  • Carbon steel needs cooling (e.g., emulsion) to prevent tool overheating.

(2) Wood and Composites

 

• Process optimization:
  • Dry solid wood to 8%–12% moisture content to reduce warping;
  • Use compressed air for carbon fiber dust collection, negative-angle tools to minimize delamination.

(3) Plastics and Rubber

 

• Temperature control:
  • Acrylic cutting speed ≤3m/min, spindle 20,000rpm to prevent edge melting;
  • Silicone requires liquid nitrogen cooling to -196℃ for brittle fracture.

(4) Stone and Glass

 

• Processing challenges:
  • Stone cutting needs continuous water cooling to prevent dust inhalation;
  • Glass requires pre-scoring + stress separation, CNC suits simple shapes only.

III. Cutting Parameters Comparison

(1) Spindle Speed and Feed Rate

(2) Tool Type Selection

• Flat end mill: For planar milling and contour cutting;
• Ball nose mill: For 3D surface engraving (e.g., relief);
• V-bit: For text engraving on signs (30°–90° angles).

IV. Common Issues and Solutions

(1) Metal cutting

• Issue: Rapid tool wear, rough surface;
• Solution: Use coated tools (e.g., TiAlN), increase coolant pressure (≥2MPa).

(2) Wood cutting

• Issue: Tearing, charring;
• Solution: Reduce feed speed (<5m/min), use tools with ≥45° helix angle.

(3) Plastic cutting

• Issue: Burring, slagging;
• Solution: Tool edge radius <0.01mm, cutting speed >15m/min.

(4) Composite cutting

• Issue: Delamination, fiber pull-out;
• Solution: Use diamond grinding heads, spindle speed ≥18,000rpm, cut depth ≤0.5mm.

V. Industry Application Cases

(1) Furniture manufacturing

• Material: MDF, solid wood;
• Process: Grooving, engraving, mortise-tenon machining;
• Efficiency: 20–30 wardrobe door panels (with carvings) in 8 hours.

(2) Advertising signage

• Material: Acrylic, PVC, aluminum sheet;
• Process: Cutting, hollowing, 3D engraving;
• Precision: Minimum text width 0.8mm, depth adjustable 0.1–3mm.

(3) Automotive interiors

• Material: Carbon fiber, leather, foam;
• Application: Dashboard molds, seat brackets;
• Technology: 5-axis cutting for complex surfaces (e.g., steering wheel covers).

(4) PCB manufacturing

• Material: FR-4 fiberglass board;
• Process: Edge milling, drilling (hole diameter ≥0.3mm);
• Precision: Line width tolerance ±0.05mm, suitable for prototyping.

VI. Equipment Selection and Material Matching

(1) Choose spindle power by material hardness

(2) Choose Z-axis stroke by cutting thickness

• Thin materials (≤10mm): Z stroke 50–100mm;
• Medium-thick materials (10–50mm): Z stroke 150–200mm;
• Special needs (e.g., stone carving): Z stroke ≥300mm.

(3) Dust collection system

• Wood/plastic cutting: Pulse bag dust collector (airflow ≥3000m³/h);
• Metal cutting: Oil mist collector (filtration ≥0.3μm);
• Composite cutting: Three-stage filtration (primary + medium + HEPA).

VII. Future Technological Trends

(1) Laser-assisted CNC cutting

• Glass/ceramic: Laser pre-heating reduces brittleness for precise contours;
• Efficiency: 3–5x faster than traditional mechanical cutting.

(2) Intelligent tool compensation

• Real-time tool wear monitoring via sensors, automatic parameter adjustment;
• Tool life prediction accuracy ±5%, reducing downtime.

(3) Multi-material composite processing

• Single machine compatible with metal, plastic, wood (e.g., Mazak VARIAXIS i-300A);
• Changeover time <5 minutes, ideal for small-batch, multi-variety production.

Conclusion