Helical Solutions 87780 Corner Radius End Mill 1/4 in 3 Flute

Product Description

The HELICAL SOLUTIONS 87780 is a single-end, corner radius end mill designed for high-performance aluminum milling. Built from solid carbide and finished with a Dplus coating, it measures 0.25 inches in diameter with a 1.25-inch length of cut and a 3-inch overall length. The 0.0100-inch corner radius reduces stress concentration at the cutting edge, helping extend tool life in demanding cuts. Three flutes with a variable pitch and chipbreaker geometry promote chip evacuation and reduce harmonics during aggressive aluminum passes. Right-hand cutting and right-hand flute direction make it compatible with standard CNC spindle configurations. This tool is center-cutting, allowing plunge entry without a pre-drilled pilot hole.

This end mill is built for machinists and CNC programmers running aluminum components in job shop, aerospace, automotive, and general manufacturing environments. The 35-degree helix angle and chipbreaker geometry are specifically suited to the long, stringy chips produced by aluminum alloys. The 0.25-inch straight cylindrical shank fits standard ER collets and end mill holders on vertical and horizontal machining centers. It is best applied in side milling, slotting, profiling, and pocketing operations where clean surface finish and chip control are priorities.

Key Features

• Solid carbide construction for rigidity and wear resistance in non-ferrous materials
• Dplus coating reduces built-up edge and improves lubricity in aluminum
• 0.0100-inch corner radius extends edge life and reduces corner chipping
• Variable pitch flute spacing dampens vibration and reduces chatter at higher feed rates
• Chipbreaker geometry breaks long aluminum chips for cleaner evacuation
• Center-cutting design allows direct plunge entry into workpiece material

Compatibility

Designed as an OEM-style replacement and direct-fit end mill for CNC machining centers and manual mills accepting a 0.25-inch straight cylindrical shank, with particular application in aluminum series toolpaths requiring chipbreaker geometry.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Secure the shank fully within the collet or end mill holder to the recommended gauge-line depth before torquing the retention system. Ensure the spindle is fully stopped and the machine is in an energy-isolated state before changing tooling. Verify runout with a dial indicator after seating to minimize premature edge wear.