Chip-Breaker Harmonic Control
Specialized chip-breaker geometry is intended to help reduce harmonics during routing of phenolic and fiber-reinforced plastic materials.


Solid-carbide, right-hand, three-flute low-helix upcut spiral router bit designed for phenolic and other fiber-reinforced plastics. Its 3/8-inch cutting diameter, 7/8-inch cutting edge, 3/8-inch shank, and 3-inch overall length combine with chip-breaker geometry to support stable routing and effective chip evacuation in compatible CNC applications.
This three-flute solid-carbide tool combines low-helix upcut geometry with specialized chip-breakers intended to help reduce harmonics while routing phenolic and fiber-reinforced plastics.
Designed for compatible CNC routers using a precision 3/8-inch (9.525 mm) collet or approved toolholding assembly with sufficient clearance for the 3-inch overall length.
The Royce Ayr 3-Flute Low-Helix Upcut Phenolic Spiral Router Bit R72-10004 is engineered for routing phenolic and other fiber-reinforced plastics. Its 0.3750-inch cutting diameter and 0.875-inch cutting edge provide a compact production format for profiling, slotting, trimming, and controlled material removal in composite-sheet applications.
The three-flute low-helix upcut geometry supports chip evacuation while maintaining stable cutting engagement. Royce Ayr specifies unique chip-breakers that help reduce harmonics during routing when the tool is matched to suitable spindle speed, feed rate, and workholding.
The 0.375-inch shank and 3.000-inch overall length require a compatible precision collet or approved toolholder. Before production, verify collet condition, runout, right-hand spindle rotation, tool projection, spindle speed, feed rate, depth per pass, workholding, material suitability, and chip extraction.
Technical Specifications
Specialized chip-breaker geometry is intended to help reduce harmonics during routing of phenolic and fiber-reinforced plastic materials.
The three-flute low-helix upcut form balances controlled cutting engagement with upward chip evacuation in compatible CNC applications.
The matching 3/8-inch cutting diameter and shank support secure precision toolholding for detailed composite-sheet routing.
Confirm that the CNC router spindle or toolholder accepts an exact 3/8-inch (9.525 mm) shank and provides sufficient clearance for the 3-inch (76.2 mm) overall length. Inspect the collet and nut, minimize unsupported tool projection, verify right-hand rotation and runout, and establish spindle speed, feed rate, depth per pass, workholding, material suitability, and chip extraction according to the machine and approved shop procedures.
The Royce Ayr 3-Flute Low-Helix Upcut Phenolic Spiral Router Bit R72-10004 provides a solid-carbide solution for routing phenolic and other fiber-reinforced plastics. Its 3/8-inch diameter, 7/8-inch cutting edge, 3/8-inch shank, three-flute geometry, and 3-inch overall length support profiling, slotting, trimming, and production routing.
Low-helix upcut geometry supports chip evacuation, while the specialized chip-breakers help control harmonics when the tool is correctly held and operated within suitable machining parameters.