Low-Helix Chipbreaker Geometry
Purpose-built for challenging composite laminates over wood or wood-composite cores, including CFRP and fiberglass-faced constructions.


Ultimax-coated three-flute low-helix chipbreaker tooling for CNC routing composite materials with wood or wood-composite cores and CFRP or fiberglass laminates. Its 1/2-inch cutting diameter, 1-1/4-inch cutting edge, 5/16-inch upcut section, 3/4-inch shank, and 4-inch overall length are configured for demanding composite-panel and entry-door cutout applications.
Three-flute right-hand low-helix chipbreaker geometry developed for composite materials with wood or wood-composite cores and CFRP or fiberglass laminates.
Designed for compatible CNC routers using precision 3/4-inch collets or approved 3/4-inch toolholding systems in composite door and laminated-composite routing applications.
The Royce Ayr R60-17008UM is a three-flute low-helix chipbreaker router bit for composite materials built around wood or wood-composite cores with CFRP or fiberglass laminates. Royce Ayr specifically identifies the family for cutouts in composite entry doors and other compatible laminated-composite routing operations.
The verified configuration uses a 0.5000-inch cutting diameter, 1.250-inch cutting edge, 0.313-inch upcut length, 0.750-inch shank, three flutes, right-hand rotation, and a 4.000-inch overall length. The low-helix chipbreaker geometry is intended to manage demanding composite cutting while limiting the aggressive lifting action associated with steeper helix designs.
R60-17008UM is the Ultimax-coated version of this configuration. Royce Ayr describes Ultimax as a coating selected after extensive testing to minimize friction, increase edge hardness, provide excellent adhesion, and support exceptional tool life in nested routing applications.
Technical Specifications
Purpose-built for challenging composite laminates over wood or wood-composite cores, including CFRP and fiberglass-faced constructions.
The published 0.313-inch upcut section works within the low-helix chipbreaker geometry while preserving the exact R60-17008UM configuration.
Royce Ayr specifies Ultimax to reduce friction, increase edge hardness, provide excellent adhesion, and support extended tool life in nested routing.
Confirm that the CNC router toolholder accepts the exact 3/4-inch (19.05 mm) shank and provides sufficient clearance for the 4-inch overall tool length. Verify right-hand spindle rotation, collet condition, runout, tool projection, workholding, extraction, and the actual laminate/core construction before production. Composite materials can vary significantly, so spindle speed, feed rate, pass depth, entry strategy, and extraction should be established for the specific CFRP, fiberglass, wood, or wood-composite stack being machined.
Royce Ayr R60-17008UM combines a 1/2-inch diameter, 1-1/4-inch cutting edge, 5/16-inch upcut section, 3/4-inch shank, three right-hand flutes, and 4-inch overall length for composite routing.
Its low-helix chipbreaker geometry and Ultimax coating are matched to composite entry-door and laminated-core applications where controlled cutting, surface integrity, and production tool life are critical.