0.0354" (0.90mm) × .197" LOC Diamond Flute PCB Router, Drill Point, 1/8" Shank | R109

Kyocera 0.90mm Diamond-Flute PCB Router | Drill Point | Up-Cut | Solid Carbide

The R109 diamond-flute carbide router features a 0.0354" (0.90mm) cutting diameter, 0.197" (5.00mm) length of cut, and standard 1/8" (3.175mm) shank. Manufactured by Kyocera, this precision PCB router is designed for machining FR4/G10 fiberglass laminates, phenolic materials, and other abrasive composites.

Its diamond-pattern cross-cut geometry combines numerous small, intersecting cutting edges with an up-cut (updraft) configuration and a drill-point tip. This combination is useful for precision PCB profiling, slots, internal cutouts, and operations requiring plunge entry.

Key Features

• 0.0354" (0.90mm) cutting diameter: Small cutting width for precision PCB routing, slots, and cutouts
• 0.197" (5.00mm) flute length: Provides cutting reach for suitable PCB laminates and composite workpieces
• Diamond-flute geometry: Multiple intersecting cutting edges help control chipping, fiber pull-out, and delamination under proper cutting conditions
• Drill-point tip: Designed to facilitate direct plunge entry into suitable materials
• Up-cut / updraft configuration: Promotes upward evacuation of routing debris
• Solid tungsten carbide: Provides rigidity and resistance to abrasive wear
• 1/8" shank: Compatible with properly sized CNC spindle collets and precision tool holders

Diamond-Flute Geometry & Drill-Point Tip

Diamond-flute routers, also called diamond-cut or diamond-pattern routers, feature a fine cross-cut arrangement of cutting edges. This geometry is commonly used in PCB fabrication and composite routing, where controlled material removal and reduced edge damage are important.

Unlike a fishtail-style router, the R109 uses a drill-point tip. This tip geometry is intended to facilitate plunge entry when starting slots, internal contours, and other cuts within the workpiece.

The updraft cutting configuration helps move chips and debris upward during routing. Actual edge finish, plunge performance, and chip evacuation depend on the material, machine rigidity, workholding, and selected cutting conditions.

Important: Diamond-flute describes the cutting-edge geometry. This tool is uncoated solid carbide, not diamond-coated or PCD tooling.

Typical Applications

• PCB board outlines, profiling, and internal cutouts
• FR4 and G10 fiberglass laminate routing
• Phenolic and epoxy laminate machining
• Fiberglass-reinforced composite trimming
• Carbon fiber composites where uncoated carbide tooling is appropriate
• Precision CNC slots, contours, and prototype fabrication

Technical Specifications

Feeds & Speeds

Proper spindle speed, feed rate, cutting depth, and secure workholding are especially important when routing PCB laminates and abrasive composites with small-diameter carbide tools.

View Diamond-Flute Router Feed & Speed Chart for starting recommendations for FR4, G10, fiberglass, and other PCB laminate materials.

Cutting recommendations are starting points only. Adjust for material, machine rigidity, spindle capability, workholding, and tool diameter. Avoid excessive cutting loads and use appropriate dust extraction when machining fiberglass or carbon fiber.

Related Router Bits & Guides

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Diamond-Flute Router Guide
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For demanding production machining of carbon fiber and other highly abrasive composites, consider our Diamond-Coated Router Bits for improved wear resistance.