If the force on the milling cutter is compared to a spear, then the clamping force of the handle is a shield. If the clamping force is not enough, the milling process will get longer and longer (tool dropping phenomenon). Among the clamping tool holders, the powerful milling tool holder has the largest clamping force and is also the most commonly used special milling tool holder. Usually, the locking of this kind of handle depends on the shrinkage and deformation of the inner diameter of the handle to realize clamping.

Cutting the surface of the workpiece with a file to make it conform to the shape, size and surface roughness required by the part drawings is called filing. This method is simple and has a wide processing range. It is mostly used after chiseling and sawing. Filing can process complex surfaces such as planes, curved surfaces, internal and external arcs, grooves and so on.

Archives common sense

Files are divided into three types according to different uses: ordinary files (or fitter files), special files and plastic files (or assorted files). Among them, ordinary files are the most commonly used. Ordinary files are divided into five types according to the different cross-sectional shapes: flat files, square files, round files, semi-circular files and triangular files.

According to its length, it can be divided into 100, 200, 250, 300, 350 and 400mm; According to its tooth type, it can be divided into single tooth type and double tooth type (mostly double tooth type); According to the tooth density, it can be divided into coarse teeth, fine teeth and smooth files (the thickness of the file is expressed by the number of teeth on the tooth surface with the length of 10mm, the coarse teeth file is 4 ~ 12 teeth, the fine teeth file is 13 ~ 24 teeth, and the smooth file is 30 ~ 36 teeth).