Onsrud Downcut Bits
This single fluted cutter is suitable for use on a wide range of plastics and woods but is especially popular when working with laminated materials or thin flexible sheets. When cutting wood a downspiral compress the tip of the material resulting in a smooth fuzz free edge. The down spiral geometry pushes the material downwards so it is securely held into place on the sacrifical bed eliminating any lifting or chipping of the material. Using a single fluted upward spiral cutter on such material would most likely lift it from the bed leading to a loss of accuracy and cut quality.