Hehe, you asked about the angle of chamfering. In fact, there is nothing public, and there are only a few reasons for chamfering. 1, easy to assemble, 2, avoid collision for structural parts that need to move each other, 3, avoid sharp edges and hand injuries when using. As for the angle, it is determined according to the actual use, not a set of formulas. Of course, important structural parts have their own rules. You can ask the master in the factory for details. Ha ha! I hope I can help you. There are not many people who are so enthusiastic about learning machinery now.