The solution is to demagnetize the watch, and this is done very easily. Magnetism tends to shorten the rotation of the balance wheel and increases the beat rate, hence a magnetized watch tends to run far too fast. Normally, it is the hairspring that is magnetized, and since this is the beating heart of an automatic watch, the magnetism will naturally affect its accuracy. A mechanical movement consists of small metal parts, and magnetism can affect how it operates. Magnetism can interfere with a watch’s accuracy. Automatic watch running fast or slow – factors that affect the accuracy Let’s look at some of the most common reasons why an automatic watch is running fast or slow – and what you can do about it. With the right care and servicing, a mechanical watch can last for generations. But that a movement is not accurate does not mean that the watch needs to be thrown away and there is nothing you can do about it. If the watch is far from these specifications, there may be something wrong with the watch.īut seeing that a mechanical movement is a delicate piece of mechanical craftsmanship, there are many reasons why an automatic movement is running fast or slow. Manufacturers normally give the specifications for their watches in terms of accuracy. One of the criteria for « chronometer » certification is the average daily rate on the first 10 days of testing: from -4 sec to +6 sec., or up to 10 seconds per day. Many watches have certifications in terms of accuracy, with the most well-known certification being COSC. But it comes down to how much it runs too fast or too slow per day. It’s rather fascinating if you think about it.īut with that said, your automatic watch will almost never be 100% accurate, and that’s okay. They consist of hundreds of parts, and somehow, they are assembled in a way that makes them tell the time. The truth is, an automatic watch will never be 100% accurate. Automatic Watch Running Fast or Slow – What to Do?
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