Short answer:
A mechanical watch keeps time using a tightly wound spring that slowly releases energy through a series of gears. This energy is regulated by a component called the escapement, which allows the gears—and ultimately the watch hands—to move at a precise and steady rate.

The Mainspring: The Watch’s Power Source

At the heart of every mechanical watch is the mainspring. This coiled spring stores energy when the watch is wound. As the spring unwinds, it releases energy gradually, powering the movement.

The Gear Train

The gear train transfers energy from the mainspring to the rest of the movement. Each gear reduces speed and increases precision, eventually turning the gears that control the hour, minute, and second hands.

The Escapement

The escapement is one of the most important components in a mechanical watch. It releases energy from the gear train in small, controlled bursts. This is what creates the familiar ticking sound.

The Balance Wheel

The balance wheel swings back and forth hundreds of times per minute. This oscillation regulates the release of energy from the escapement and keeps the watch running at a consistent pace.

Why Mechanical Watches Still Matter

Mechanical watches are admired because of their craftsmanship. Hundreds of tiny components work together without electronics or batteries. That engineering and artistry are why collectors still value mechanical watches today.