Helical Solutions 86934 Corner Radius End Mill 3/4 in 4 Flute

Product Description

The HELICAL SOLUTIONS 86934 is a solid carbide corner radius end mill built for high-performance material removal in demanding machining environments. It features a 3/4 inch diameter, a 0.0300 inch corner radius, and four flutes in a right-hand spiral configuration. The Tplus PVD coating provides thermal resistance and wear protection suited for aggressive cutting applications. At 6 inches overall length with a 1 inch length of cut and 4.125 inch reach length, this tool is designed for extended-reach work without sacrificing rigidity. The variable pitch geometry reduces harmonic chatter during both roughing and finishing passes.

This end mill is intended for machining stainless steel, superalloys, titanium, hardened steel, and cast iron. It is well suited for aerospace, medical, and die-mold applications where tight tolerances and difficult-to-machine alloys are common. The centercutting design allows plunge entry, and the single-end configuration makes it compatible with standard straight-cylindrical toolholders. High-precision toolholders are recommended to maintain TIR within the 0.0005 inch maximum specification.

Key Features

• 0.0300 inch corner radius with a tolerance of -0.0020 to 0.0020 inches for controlled edge blending
• Tplus PVD coating rated for stainless steel, high-temperature alloys, and hardened steel
• Variable pitch fluting reduces chatter during both roughing and finishing operations
• Centercutting geometry allows direct plunge milling without a pre-drilled entry hole
• Extended reach of 4.125 inches with a neck diameter of 0.7120 inches for deep-cavity access
• Right-hand cut and right-hand flute direction for use with standard CNC spindle rotation

Compatibility

Part of the HSV-RN-4 series. Recommended for use with high-precision toolholders. Primary workpiece materials include stainless steel, superalloys, and titanium. Secondary workpiece materials include steel and cast iron.

Installation Notes

Installation should be performed by a qualified machinist familiar with CNC tooling setup and safe tool-change procedures. Ensure the machine spindle is fully stopped and the control is in a safe state before mounting or removing the end mill. Use a high-precision toolholder to keep TIR at or below 0.0005 inches per specification. Verify correct tool offset entry in the CNC controller before beginning a cut.