>> demagnetizing a watch (if it's running too fast)
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Thread: >> demagnetizing a watch (if it's running too fast)

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  1. #1
    Member WeylandYutani's Avatar
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    >> demagnetizing a watch (if it's running too fast)

    Hi all,

    Somehow my watch became magnetized as I noticed it was running exactly 4.5 seconds fast per hour consistently.

    So, to diagnose the problem I made a home made compass out of a magnetized pin, some tin foil and a cup of water.

    Upon nearing the watch to the compass the needle moved swiftly. Problem confirmed.

    Fed up of having to reset the time every day I purchased a Demagnetizer (made by Anchor) as seen here:

    Watch Accessories for Sale

    So, I tried to use the demagnetizer by keeping the button depressed and moving the watch close to the flux area (about half inch) and then away again slowly. I'd do this several times in different directions (to the left, right, up-horizontal, down horizontal and up vertical). Each time changing the orientation of the watch (crown down, crown up etc). Also, I made sure the watch was running at the time so the hairspring didn't get tangled.

    I did this process several times as after each time there was a little magnetizm left (i checked easily with my iPhone 4 compass (by placing the watch on the screen) and it moved only a couple of degrees vs. 50-60 degrees in the beginning.

    Eventually I stopped when the watch no longer disturbed my iPhone compass.

    Now here are the results:

    instead of gaining 4.5 seconds per hour it is now gaining 1 sec (consistently) per hour.

    OK, that's fine but this watch is a Longines and I expect more.

    I try the process a couple more times with no improvement.

    Does anyone have any recommendations for dealing with the 1 sec gain or my technique ?

    Cheers.
    Time On My Hands likes this.
    - Too many watches, not enough time...

  2. #2
    Member niles316's Avatar
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    Re: >> demagnetizing a watch (if it's running too fast)

    How was its accuracy before it was magnetised? Maybe it was also +1s/hr initially? Anyhow, if your watch isn't magnetised anymore, you might wanna just regulate it?

  3. #3
    Member WeylandYutani's Avatar
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    Re: >> demagnetizing a watch (if it's running too fast)

    Quote Originally Posted by niles316 View Post
    How was its accuracy before it was magnetised? Maybe it was also +1s/hr initially? Anyhow, if your watch isn't magnetised anymore, you might wanna just regulate it?
    Before magnetism the accuracy was incredible. It has an ETA 2892-A2 (L619).

    I was hoping not to open it (i wouldn't want dust to enter the dial since it opens from the front).

    Although i'm not picking up any more magnetism using my method i suspect there might still be a little more left.
    Last edited by WeylandYutani; December 24th, 2010 at 10:00.
    sprocketmy likes this.
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  5. #4
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    Re: >> demagnetizing a watch (if it's running too fast)

    hmm... I wonder if magnetism can have a residual effect on the movement when it leaves .

  6. #5
    Member lysanderxiii's Avatar
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    Re: >> demagnetizing a watch (if it's running too fast)

    Quote Originally Posted by WeylandYutani View Post
    Before magnetism the accuracy was incredible. It has an ETA 2892-A2 (L619).

    I was hoping not to open it (i wouldn't want dust to enter the dial since it opens from the front).

    Although i'm not picking up any more magnetism using my method i suspect there might still be a little more left.
    If your compass does not record any major swings towards the watch, there is no magnetism "hiding" in your watch. And, even if the needle deflects away from north the a few degrees in the direction of your watch, it doesn't mean your watch is magnetized. Remember, the case will hold a slight magnetic field. Your demagnetizing technique sounds adequate.

    There are many reasons why a watch will change rate, 24 seconds per day is not likely a magnetic problem.
    familiaritas parit contemptum; raritate admiratione wins.- Lucius Apuleius
    est necessry, accurate ad secundo? - Lysander magna
    iustum est horologium - Obscurus Genius

  7. #6
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    Re: >> demagnetizing a watch (if it's running too fast)

    My experience has been that magnetized watches run really, really fast - something like hours fast/day. While how you demagnetized the watch is the correct way to do so and it did make it run better, I don't think there's much more to do regarding magnetization...

    How accurately was the watch running before? How long have you had it. Perhaps it's time for a service? There's any number of opinions on when a watch should be serviced. My belief is that I will have my watches serviced when I notice they're running differently than they usually do. I know how well all of my watches run (most are within a few seconds/day) If a watch starts to vary, I may regulate it if it hasn't been too long since the previous service or if it's a newer watch. But if I don't know when it was last serviced (as is often the case as I do purchase many pre-owned watches) or I know it's time for the service - off it goes to get serviced.

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