Drag Cut Porting Burrs Extended Shank

Drag Cut High Helix Carbide Porting Burrs

While many factors impact the outcome of a machining operation, one often overlooked factor is the cutting tool’s helix angle. The Helix angle of a tool is measured by the angle formed between the centerline of the tool and a straight line tangent along the cutting edge. A higher helix angle, usually 40° or more, will wrap around the tool “faster,” while a “slower” helix angle is usually less than 40°. When choosing a tool for a deburring or machining operation, machinists often consider the material, the tooling dimensions and the flute count. The helix angle must also be considered to contribute to efficient chip evacuation, better part finish, prolonged tool life, and reduced cycle times. Benefits Lower Radial Force – The tool will run quieter and smoother due to better shearing action, and allow for less deflection and more stability in thin wall applications. Efficient Chip Evacuation – As the helix angle increases, the length of cutting edge engagement will decrease, and the axial force will increase. This lifts chips out and away, resulting in efficient chip evacuation. Improved Part Finish – With lower radial forces, high helix tools are able to cut through material much more easily with a better shearing action, leaving an improved surface finish. 

Porting burrs are specialized carbide cutting tools, used with die grinders, for shaping and smoothing engine intake/exhaust ports to improve airflow for better performance, featuring different cuts (double-cut for versatility, aluminum-specific), shapes (tree, oval for curves; straight for straightening), and helix angles (high helix for aggressive removal) for specific materials like aluminum or cast iron, requiring patience and control to avoid over-cutting.