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| Magnetising: new one on me... https://www.breitlingsource.com/phpBB2/viewtopic.php?f=28&t=46854 |
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| Author: | Novacastrian [ Sun Apr 14, 2013 10:11 pm ] |
| Post subject: | Magnetising: new one on me... |
I always thought that magnetised watches went kind of haywire: gaining hours every day. My Blackbird was gaining about four minutes each day. I never bothered to check if it was exactly the same amount but it was close. I took it to my watchmaker today and he told me it was magnetised. In the 8 hours since he de-magnitised it, it's still accurate to the second. So a new take on magnetised watches for me! |
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| Author: | Dr J [ Sun Apr 14, 2013 10:44 pm ] |
| Post subject: | Re: Magnetising: new one on me... |
Glad to hear it was easily fixed! They aren't always so easily fixed... I know one Radiologist at work who three times over the past 10 years has walked into the MRI chamber with a Rolex on and destroyed them  When I go anywhere near the MRI, my watches are the first thing that comes off! |
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| Author: | TomP [ Mon Apr 15, 2013 1:41 am ] |
| Post subject: | Re: Magnetising: new one on me... |
This thread made me realise I was fairly ignorant on what might actually cause the magnetism of a watch, so I thought I'd Google around for some basic info. After nosing around numerous sites and threads, lo and behold the best piece I found was right here... viewtopic.php?f=6&t=16539 |
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| Author: | Roffensian [ Mon Apr 15, 2013 4:42 am ] |
| Post subject: | Re: Magnetising: new one on me... |
Magnetised watches usually gain dramatically because the hairspring 'sticks' to itself and significantly reduces the effective length, thereby increasing the frequency of the movement. However, slight magnetism will have a much less dramatic impact and is becoming more common with magnetic resistant materials. In terms of magnetism ruining a watch - it is always a 2 second job to demagentise a watch - just pass it through a demagnetiser, so if a watch got destroyed by an MRI machine then something got permanently damaged by the magnetic field - entirely possible I suspect with fields of that sort of strength. |
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| Author: | Dr J [ Mon Apr 15, 2013 12:45 pm ] |
| Post subject: | Re: Magnetising: new one on me... |
Roff: Yep more a case I believe of the watch on the wrist being smashed into the MRI at high speed by the irresistable pull rather than pure 'magnetization' |
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| Author: | Roffensian [ Mon Apr 15, 2013 1:42 pm ] |
| Post subject: | Re: Magnetising: new one on me... |
Dr J wrote: Roff: Yep more a case I believe of the watch on the wrist being smashed into the MRI at high speed by the irresistable pull rather than pure 'magnetization' That kinda changes the story a bit!!! 
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| Author: | Novacastrian [ Tue Apr 16, 2013 3:24 am ] |
| Post subject: | Re: Magnetising: new one on me... |
As a followup, my SOSF was running about 90 seconds fast a day. Turns out it was magnetised too. The Blackbird is now 5 seconds fast over 36 hours and the SOSF is 1 second fast after 12 hours. So demagnetising fixed both. My hunch is that they MAY have been magnetised by sitting them on the microwave oven while it was going??? |
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| Author: | Driver8 [ Tue Apr 16, 2013 3:58 am ] |
| Post subject: | Re: Magnetising: new one on me... |
Novacastrian wrote: My hunch is that they MAY have been magnetised by sitting them on the microwave oven while it was going??? That's a definite possibility. |
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| Author: | P51 [ Tue Apr 16, 2013 3:59 am ] |
| Post subject: | Re: Magnetising: new one on me... |
Novacastrian wrote: As a followup, my SOSF was running about 90 seconds fast a day. Turns out it was magnetised too. The Blackbird is now 5 seconds fast over 36 hours and the SOSF is 1 second fast after 12 hours. So demagnetising fixed both. My hunch is that they MAY have been magnetised by sitting them on the microwave oven while it was going??? Hey Novacastrian, Whatever you are putting in that Microwave that requires you to remove your watch........... Wow  
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| Author: | Dr J [ Tue Apr 16, 2013 3:26 pm ] |
| Post subject: | Re: Magnetising: new one on me... |
Novacastrian wrote: My hunch is that they MAY have been magnetised by sitting them on the microwave oven while it was going??? Not even sure how this situation would come around! |
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