Selecting a Corner Rounding End Mill on Amazon.com
Corner rounding end mills are rotary cutting tools with multiple edges used in a milling machine or lathe to round off sharp corners on the edge of a workpiece in machining applications. They have a non-center cutting design, and the cutting edges or flutes have a concave radius for milling convex edges on the outside diameter of most metals and creating a uniform finish.
Corner rounding end mills are most often made of carbide, cobalt steel, or high speed steel (HSS). They can be finished with diamond, titanium nitride (TiN), titanium carbonitride (TiCN), or titanium aluminum nitride (TiAIN) to increase hardness, abrasion resistance, and cutting efficiency. Form relieved end mills have side and radial clearance and can be sharpened by grinding the face of the teeth with minimal change to the size and form of the radius. There are single-end corner rounding end mills or double-ended with a cutter on both ends of the tool, which can be rotated to a new cutting surface when the first becomes worn.
A corner rounding end mill's size is specified by the radius of the circular form the cutter produces on the workpiece and goes up to one-quarter of a circle. The diameter of the tip or pilot determines its usage. A corner rounding end mill with a small pilot can fit into small slots, holes, and corners, while a large pilot increases strength and can be used at higher speeds for profiling large areas.