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Webwatchmaker*said:Today*18:36
It surprises me how many watches become magnetised too. Whether it's the Royal Mail automatic sorting system or a simpler reason such as closeness to a loudspeaker or even a visit to an X ray department. Difficult to know.
When you spin the wheels in the watch the steel escape wheel will act like a compass and always stop in the same orientation.
Or coils of the balance wheel will stick together.
It's best to demagnetise each individual steel component and not the whole movement n one go because the demagnetiser is usually not powerful enough to demagnetise the entire watch successfully and can increase its magnetism.
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walkerwek1958*said:Today*18:14
Magnetism.
Just assembled a Seiko movement this afternoon, all looked well, broke off to do a few things then returned to finish it. Couldn`t understand why the amplitude was struggling around 230°. Couldn`t remember demagnetising it (that's what happens when you break off a job) so I treted it to a dose of the demagnetiser. Hey presto, amplitude improves to 285° and the rate falls by approx. 40 secs. Textbook example of a magnetised movement.*
Adjusting the rate's a simple job, so all's now well. A freshly assembled watch with low amplitude is bad news for a repairer.....something's definitely wrong if that happens, in this case the answer was the obvious one.*
I used to have a sticker on my Timegrapher with the word 'demagnetise' on it.......I think it needs to return.
God knows how these watches get magnetised thesedays, this is a steel-cased watch, no glass back. It's nothing to do with the case being affected, this is the movement running on the bench, but it's clearly become magnetised during the watch's life. I`ll demag the case too...I think that may be wise!
Paul
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