Ball Nose End Mills

Ball Nose End Mills

Ball nose end mills are milling cutters with a hemispherical tip geometry, used primarily for profiling curved surfaces, 3D contouring, die and mould work, and finishing complex shapes. Unlike square-end mills, the ball nose radius eliminates sharp corners in the cutter path, allowing smooth transitions across contoured surfaces.

Sutton Tools and Bordo

AIMS stocks solid carbide ball nose end mills from Sutton Tools and Bordo. Sutton's VHM (solid carbide) range spans 2-flute slot drill geometry (E602/E605) for plunge entry and slotting, and 4-flute designs (E606/E607) for higher feed rates in finishing and semi-finishing cuts. TiAlN coating (E605, E607) is available for improved heat resistance and tool life in hardened steels and heat-resistant alloys. The E320 series provides extra-long reach for deep-cavity mould work.

2-Flute vs 4-Flute

2-flute ball nose end mills allow centre cutting and better chip evacuation, making them suitable for slotting and plunge cuts. 4-flute designs carry higher feed rates and produce a better surface finish in profiling and semi-finishing passes. For soft, gummy materials like aluminium, 2-flute is generally preferred; for steel and harder materials, 4-flute delivers better productivity.

TiAlN Coating

TiAlN (titanium aluminium nitride) coating increases surface hardness and oxidation resistance, enabling higher cutting speeds and longer tool life particularly in dry or minimum-quantity lubrication (MQL) conditions. It is well suited to hardened tool steels, stainless steel and nickel alloys where uncoated carbide wears rapidly.

Metric Sizes

All ball nose end mills stocked at AIMS are metric diameter, covering the most common sizes used in CNC machining centres and manual knee mills. For toolpath programming, the ball radius is equal to half the nominal cutter diameter.

Applications

Ball nose end mills are the standard choice for die and mould profiling, sculptured surface machining, 3D roughing and finishing, and ramping or helical entry moves. They are not the preferred option for square-shoulder profiling or flat-bottomed pockets — square end mills suit those applications better.