What is the reason why carpenters dig around and sweep the tail?

What you said upstairs is wrong. There are many reasons for biting the head, but it has nothing to do with the sharpness of the knife and the speed. Don't mislead people. In fact, if you set the platform too high, you have to lower it, or if you set the knife too high, you have to lower it. The upper bite is related to the height of the upper pressure plate. If you can't hold it down, you will definitely bite your head.