The TWO TREES Blue Nano-Coated Engraving Bit Set (0.8–3.175mm, 10 Pcs) is a professional assortment of micro-grain solid tungsten carbide end mills engineered for precision CNC routing, PCB isolation milling, 3D relief carving, and profile contouring. Enhanced with a high-durability Blue Nano composite coating, these corn-tooth/fish-tail style router bits deliver superior surface hardness, reduced cutting friction, and extended tool life across a wide variety of materials, including FR-4 circuit boards, hardwoods, acrylic, carbon fiber, and aluminum composites.

Specification

• Brand / Manufacturer: TWO TREES
• Product Name: Blue Nano Coated CNC Milling / Engraving Bit Set
• Quantity: 10 Pieces per Set (Assorted Sizes with Individual Protective Storage Case)
• Cutting Diameters Included: 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.5mm, and 3.175mm (1/8")
• Shank Diameter: 3.175mm (1/8" Standard CNC Collet Size)
• Overall Length (OAL): Approx. 38mm
• Cutting Edge Length (Flute Length): Approx. 5.5mm to 12mm (scaled proportionally by diameter)
• Substrate Material: Ultra-Fine Micro-Grain Solid Tungsten Carbide (Cemented Carbide)
• Surface Coating: Blue Nano (AlTiN / Nano-Composite Coating)
• Coating Hardness: Up to HV 3000 – 3500 (Heat resistance up to 800°C)
• Cutting Geometry: Corn-Tooth / Diamond-Pattern Rasp Flutes with Fish-Tail Plunge End
• Spindle Compatibility: Fits standard 1/8" (3.175mm) ER11, ER16, ER20 collets, trim router adapters, and rotary tool chucks.

Features

• Blue Nano Composite Coating: Provides a high-hardness, low-friction protective barrier that withstands high cutting temperatures (up to 800°C), preventing chip welding and dramatically increasing cutting life over uncoated carbide.
• Micro-Grain Tungsten Carbide Core: High-density carbide construction provides exceptional rigidity and edge retention, minimizing tool deflection and chatter during high-speed CNC milling.
• Corn-Tooth / Fish-Tail Cutting Geometry: Diamond-knurled cutting edges actively shear fibers and shred chips into fine dust, preventing edge burring, layer delamination, and top-surface tear-out on composite sheets and laminate boards.
• Universal 1/8" (3.175mm) Shank: Standardized shank diameter ensures drop-in compatibility with CNC 3018 PRO, Genmitsu, Two Trees TTC450/TTC300S, Shapeoko, and handheld rotary tools without requiring collet swaps.
• Versatile Incremental Sizing: Ten distinct cutter diameters from 0.8mm up to 3.175mm provide the ideal tool for intricate PCB trace isolation, tight-corner pocketing, deep contour slots, and perimeter roughing.

Common Applications

• PCB Isolation Milling & Drilling: Rapid prototyping of custom double/single-sided FR-4 and copper-clad circuit boards with clean, burr-free trace separation.
• Hardwood & Plywood 2D/3D Carving: Intricate relief sculpting, signage lettering, fretwork, and detailed craft routing in oak, walnut, bamboo, and MDF.
• Acrylic & Engineering Plastics: Precision cutting and slotting in Cast Acrylic (PMMA), Polycarbonate, Delrin/POM, Nylon, and ABS without melt buildup.
• Composite Sheet Routing: Clean edge cutting and hole drilling in Carbon Fiber plates, fiberglass (G10/FR4), and Aluminum Composite Panels (ACP/Dibond).

Professional Operation and Maintenance Tips

• Match Feed Rates to Bit Diameter: Smaller diameter bits (0.8mm to 1.4mm) have delicate stems; reduce plunge and feed rates (recommended plunge: 100–300 mm/min, feed: 300–800 mm/min) with light depth-per-pass (0.2mm–0.5mm) to avoid snapping the tool.
• Maximize Spindle Speed for Clean Cuts: Carbide micro-tools perform best at high surface speeds. Run spindles between 12,000 RPM and 24,000 RPM for smooth finishes and minimal cutting resistance.
• Use Proper Collet Seating: Insert at least 20mm of the shank into the ER collet to maximize clamping surface area and minimize tool runout; never clamp directly on the cutting flutes or the transition taper.
• Implement Active Dust Collection or Air Assist: The corn-tooth profile produces fine powdered chips. Using an air blast or active vacuum shoe prevents chips from re-packing inside deep cut channels, reducing friction and extending tool life.