Tables that need to be winded generally refer to mechanical watches. Mechanical watches are classified into: manual mechanical watches and automatic mechanical watches. The manual mechanical watch needs to wind the movement regularly (preferably at a fixed time every day) through the crown and turn it clockwise. The concept of "correctness" is mainly to prevent the emergence of the clockwork. The most common power reserve is about 40 hours of manual mechanical watches. The first winding is about 25 windings. If it is not full, there is no need to continue tightening. The sign on the clockwork is that the clockwise screwing of the crown is not possible. But sometimes people mistakenly believe that it's a stuck shell and they continue to screw it. If suddenly they can twist the clockwork, the winding spring will be broken. Therefore, in addition to the long-power movement (100 hours power reserve and above), ordinary manual mechanical watches can be screwed 25 times a day, but also more protective movement. Long power movements must be screwed 40 or more. The general principle is, never twist it hard. Automatic mechanical watches are the development of manual mechanical watches, so have the basic elements of manual mechanical watches. If you feel that the arm is shaking too slowly during the winding process, it is also possible to directly rotate the crown 25 clockwise. In addition, because the automatic mechanism of the automatic mechanical watch is not as controllable as the manual control, the automatic mechanical watch has a function of full idling idling, that is, the automatic mechanical watch no matter how much the crown is twisted, the mainspring will not be broken. Only a little buzzing of excess energy is heard (this delicate sound is very easy to ignore. It is harder to hear at sober moments, and it is completely unreadable after drinking).