Flat bottom design: The bottom edge of the bottom cleaning knife must be completely flat, and it is best to use a "center cutting" method, so as to mill the entire bottom surface like a planer.
Large diameter and multiple blade count: In order to improve efficiency and surface quality, bottom cleaning knives are usually larger in diameter (commonly such as 6mm, 10mm, 12mm and above) and use 2 or more blade counts. The larger the diameter, the wider the coverage area, and the higher the cleaning efficiency; The more blades (such as 3 blades), the faster the feed at the same speed, and the better the bottom surface finish.
Straight edge or small helix angle: Bottom cleaning knives are mostly designed with straight edges (such as straight milling cutters) or small helix angles. Because bottom cleaning processing mainly involves axial cutting (vertical force), the requirements for chip removal are not as high as side milling, and the straight edge structure is simpler and more rigid.
Working process: The CNC program controls the bottom cleaning tool to perform equidistant reciprocating parallel path milling (row cutting) or spiral path milling from inside out/from outside in the area that needs to be leveled, ensuring that the tool path covers the entire bottom surface without leaving any dead corners.
