Automatic watch: how does it work?

An automatic watch is a mechanical watch that winds itself using the natural movements of the wrist. Unlike quartz watches, it does not run on a battery but on a complex watchmaking mechanism composed of numerous parts.

This type of watch is particularly appreciated by watch enthusiasts for its fully mechanical operation.

The principle of automatic movement

In an automatic watch, the energy needed to power the movement is generated by a rotor . This semi-circular part rotates freely when the watch moves on the wrist.

The arm's movements drive the rotor, which transmits energy to a winding system that winds the watch's mainspring.

This energy is then gradually released to power the entire mechanism.

The role of the main spring

The mainspring is an essential part of the mechanical movement. It stores the energy accumulated by the rotor and gradually releases it to power the watch.

This energy is used in particular to turn the hands and ensure the precision of the movement.

The power reserve

Power reserve refers to the amount of time an automatic watch can operate without being worn.

Depending on the movements, it is generally between 38 and 50 hours . This means that the watch can continue to run for one or two days even if it is not worn.

Why are automatic watches so fascinating?

Automatic watches appeal to many enthusiasts because they represent true watchmaking expertise. Their operation relies on a set of extremely precise mechanical parts that work together to measure time.

Unlike quartz watches, they do not require a battery and can operate for many years with proper maintenance.

Automatic watches at CG Custom Watches

At CG Custom Watches , our watches use Seiko automatic movements , renowned for their reliability and robustness.

Each watch is hand-assembled in our workshop in Switzerland , after being configured according to your preferences using our configurator.