The Precision Twist E6304 uncoated carbide square end mill has four flutes, a 30-degree helix angle, and an extra-long-length design for applications that require a longer reach than long-length end mills. Extra-long length end mills have longer cutting edges than long-length end mills for deep slotting and applications with a high depth of cut. The four flutes produce a better finish than fewer flutes. The carbide substrate is harder than high-speed or cobalt steel, making it more wear resistant at high speeds and providing longer tool life. With no coating or surface treatment, this uncoated tool can be used on a broad range of materials.
The tool’s square end creates sharp, unrounded cuts. The 30-degree helix angle supports general-purpose applications. It balances lower angles’ strong cutting edge for difficult-to-machine materials with higher angles’ increased cutting action. The center-cutting design has cutting teeth at the end of the tool, so it can be fed into the workpiece like a drill bit; it can also be used for slotting and ramping. The cutting diameter tolerance is +0.000 to -0.002”. This tool has a round shank.
End mills are designed to remove material and create multi-dimensional shapes and profiles. They have cutting edges along the outside diameter and flutes that remove chips from the cutting area and allow cooling fluids to enter. If heat is not reduced effectively, the tool’s cutting edges will dull and additional material buildup can occur. The number of flutes can range from two to eight. Two-flute designs offer the most efficient chip removal, but more flutes provide a smoother finish. The shank is the end of the tool held in place by a tool holder or machine. Center-cutting end mills can create three-dimensional shapes and profiles, and make plunge cuts similar to a drill bit. Non-center-cutting end mills are for applications such as peripheral milling and finishing, but cannot make plunge cuts.