1. In order to avoid scratches and burns to the appearance of the workpiece, special care must be taken when polishing with # 1200 and # 1500 sandpaper. Therefore, it is necessary to load a light load and polish the exterior with a two-step polishing method. When polishing with each type of sandpaper, it should be polished twice in two different directions, each time between the two directions of 45 ° ~ 90 °.
2. When changing to different types of sandpaper, the polishing direction should be changed from 45 ° to 90 °, so that the streak shadow left by the previous type of sandpaper after polishing can be distinguished. Before changing to different types of sandpaper, you must carefully wipe the polished surface with 100% cotton and a cleaning solution such as alcohol, because a small grit left on the surface will destroy the entire polishing work. When changing from polishing with sandpaper to polishing with diamond paste, this cleaning process is equally important. Before polishing continues, all particles and kerosene must be completely cleaned.
3. Polishing with sandpaper requires the use of soft mallets or bamboo sticks. When polishing a round or spherical surface, use a soft mallet to better cooperate with the curvature of the round and spherical surfaces. The harder wood strips, like cherry wood, are more suitable for polishing the flat surface. The end of the trimmed wood strips can be kept in line with the shape of the steel parts, so that the sharp angles of the wood strips (or bamboo strips) can touch the steel parts and form deep scratches.