1, forward gear, cross gear, push gear. The forward gear can file the workpiece in the same direction, so the correct file marks can be obtained after filing, which is neat and beautiful.
2. Cross filing is to file the workpiece from two cross directions, and the file marks in the forward direction are not beautiful. When filing, the contact area between the file and the workpiece is large, and the file is easy to grasp. The file surface can be judged from the file marks, and it is easy to file the plane flat.
3. File pushing is to hold the file symmetrically with both hands, push the file with the thumb and push the file along the length direction of the workpiece, so the file marks are straight and beautiful, and it is easy to file flat. However, the file pushing method can not give full play to the strength of manpower and the filing efficiency is not high. Straight file, only suitable for the last file and the plane with small file. Cross file is used for semi-finishing before final file.