1. The problem of the frequency of the pendulum of a mechanical watch. The speed of a mechanical watch. It is mainly determined by the frequency of the mechanical watch's oscillation. Usually the greater the oscillation, the lower the frequency of the oscillation. The smaller the amplitude of the oscillation, the greater the frequency of the oscillation. Generally speaking, mechanical watches rely on the winding of the balance spring to control the amplitude of the oscillation. This is the basic principle of adjusting the speed. The longer the hairspring is available for retraction. This increases the amplitude of the oscillation. The frequency of the oscillation will become smaller. The watch will be slower, conversely. The oscillation frequency increases. The watch becomes faster.
2. The structural problems: By the Earth's gravitational effect. The horizontal position and vertical position of the offset will produce a bit of difference. Clockwork from uptight to relax. The torque is not balanced. In addition to the external temperature. Magnetic field, Vibrations, etc. Mechanical watches, even if the frequency is increased some more. It is also impossible to reach the accuracy of quartz electronic watches.
3. Magnetic field effect: After the hairspring encounters magnetization is magnetized. The circle is only shown between the circle and the circle when worn. There will be sticking or a short hitching circle. Especially when in the upright. The hairspring will droop and hang down by its gravity. The shaking of the arm will intensify its radial movement. The magnetic energy effect shows because of this.