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Carbide rotary file cutter The cross-sectional shape of the rotary file CNC blade should be selected according to the shape of the filed device, so that the two appearances are consistent. When filing the inner arc surface, you should choose a half-pipe wrench or a pipe wrench (small diameter product workpiece); when filing the bottom corner surface, you should choose a semicircular file; when filing the inner bevel surface, you can use a flat file or a square file. File etc. When using a flat file to file the inner bevel surface layer, pay attention to make the narrow surface (wrinkle cloth) of the pipe wrench without teeth close to one surface of the inner bevel angle to prevent the bevel surface layer from being damaged by knocking.