Summary of How does a self-winding watch work?
This article explains the mechanism of self-winding watches, noting their enduring popularity despite the rise of quartz technology. It describes a semi-circular metal rotor that moves with gravity as the wearer's arm swings, driving a gear train to wind the mainspring. This stored energy powers the watch for approximately 36 hours without manual winding.
Parts used in the Self-Winding Watch:
- Semi-circular metal piece (rotor)
- Gear train
- Spring (mainspring)
I can remember when the first quartz watches came out, they were going to be the end of normal mechanical watches, just like video tape was going to be the end of theaters. Somehow, it hasn’t worked out that way, and self-winding watches are more popular than ever.
The following pictures show you the backside of a typical self-winding watch:
This watch happens to have a clear back so you can see inside. Highlighted in the second picture is a semi-circular metal piece that is the heart of a self-winding watch. Relatively speaking, this semi-circular piece is fairly heavy, and it is therefore affected by gravity. As you move the watch, this piece will move so that it is always pointed toward the ground. If you have time to load a 350-kilobyte MPEG file, then this six-second video will show you how the piece moves. As you walk, with your arm swinging back and forth, this piece moves back and forth inside the watch.
The piece is attached to a gear train that gears it way down. Each movement of your arm winds the spring the tiniest bit, but since you move your arm so much it keeps the watch wound easily. The spring in the watch stores enough energy to keep the watch going for about a day and a half if you leave it on your dresser.
For more Detail: How does a self-winding watch work?
- How does a self-winding watch work?
The semi-circular metal piece moves with gravity as you move your arm, turning a gear train to wind the spring. - What happens to the semi-circular piece when you walk?
It moves back and forth inside the watch as your arm swings. - Can a self-winding watch run without being worn?
Yes, it stores enough energy to keep going for about a day and a half if left on a dresser. - Does the semi-circular piece have weight?
Yes, it is described as relatively heavy so it is affected by gravity. - Why are self-winding watches still popular?
They remain more popular than ever despite the introduction of quartz watches. - How much energy does the spring store?
The spring stores enough energy to power the watch for about thirty-six hours. - What connects the moving piece to the winding mechanism?
A gear train is attached to the semi-circular piece to gear its movement down.
