Harvey Tool 823478 Ball End Mill 0.078 in 3 Flute Carbide

Product Description

The HARVEY TOOL 823478 is a miniature solid carbide ball end mill designed for precision milling in tight geometries and small-feature work. With a 0.078 inch (5/64 inch) cutter diameter and a 0.117 inch reach length, this stub-length tool is built for rigidity and accuracy in close-tolerance applications. The 3-flute, right-hand helical geometry with a 30-degree helix angle promotes efficient chip evacuation while maintaining a smooth finish. The bright uncoated carbide construction makes it suitable for a wide range of workpiece materials. Licensed machinists and CNC programmers working in job shop, toolroom, and production environments are the primary users of this end mill.

This end mill is suited for both roughing and finishing passes on small features in steel, stainless steel, cast iron, and non-ferrous metals. The stub length profile reduces deflection, which is critical when milling miniature slots, contours, and 3D profiles at small diameters. It fits a 1/8 inch straight-cylindrical shank, making it compatible with standard collet systems found on CNC machining centers, high-speed spindles, and manual mills equipped with appropriate collet holders.

Key Features

• 0.078 inch ball nose diameter with a 0.039 inch nose radius for fine-detail contouring
• 3-flute, right-hand helical flute design at 30 degrees for balanced cutting action
• Stub length construction (0.117 inch reach) maximizes rigidity and minimizes deflection at small diameters
• Solid carbide construction provides hardness and wear resistance across P, M, K, and N workpiece material classifications
• Bright uncoated finish suitable for non-ferrous metals and applications where coating is not required
• Single-end configuration with a 1/8 inch straight-cylindrical shank for broad collet compatibility

Compatibility

Designed for use in CNC machining centers and milling machines equipped with 1/8 inch collet systems. Rated for steel, stainless steel, cast iron, and non-ferrous metal workpieces per material classification codes P, M, K, and N.

Installation Notes

Installation should be performed by a qualified machinist or CNC setup technician. Ensure the machine spindle is fully powered down and locked out before changing tooling. Seat the 1/8 inch shank fully into the collet and torque the collet nut to the collet manufacturer's specification. At this diameter, runout control is critical — verify tool runout with a test indicator before beginning a production cut to avoid premature tool breakage.