An automatic movement is a form of a mechanical movement referred to as a self-winding automatic movement. These mechanical movements provide energy to the mainspring derived from the motions of the user's wrist. Automatic movements tend to be very popular because the wearer does not have to worry about constantly winding the watch to maintain operation. Once the power reserve is filled, the timepiece must be worn actively for 8 to 10 hours per day to sufficiently self-wind and remain powered.

How an Automatic Movement Works

Automatic movements function nearly the same way as manual movements, with the addition of an oscillating metal weight, or rotor. The rotor is attached to the movement and rotates freely. Wrist movement causes the rotor to spin which provides energy to wind the mainspring.

 

Winding Intervals

Automatic watches still require winding, but less often than manual timepieces. If a watch is worn every day, it should maintain timekeeping functions without requiring additional winding. If a watch has not been worn for an extended period or is constantly left idle overnight, it will need to be wound in order to fill the power reserve. A simple alternative to manually winding automatic watches is to use a watch winder, which will keep the watch wound when not in use.