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margolisd

My Demagnetiser is Magnetising

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On 1/20/2019 at 9:14 PM, margolisd said:

Yeah, thanks Tmuir you are indeed correct. Preventing the HS from vibrating causes it to demagnetise. I put it in a plastic bag and held it gently in my fingers and it worked.

Does this mean it's best to remove the hairspring to demagnetise a watch movement and do the HS separately? As I'm sure it was my attempt to demagnetise a movement that ended up magnetising the HS in the first place.

Another thing that seemed to help, before I was only holding the button down and moving the object about half a meter out of the field. A full meter as suggested by ecodec actually seemed to make a big difference.

Thanks everyone. Mystery solved.

Glad I helped.

To give full credit I was told this by a lecturer at one of my night classes at the watch and clock school I attend.

I have demagnatised whole watches successfully before, but only using an expensive Greiner Magnomatic Demagnetiser unit that has built in decay, so you don't need to move it away at my watch school, never on my cheap Chinese demag. Also when the hairspring is in place both ends of the spring are restrained which won't completely stop the vibration, but will limit it.

I also agree that the full meter is important, I basically move it as far away as I can stretch my arm

You can see the same thing happen with tweezers if you try to demag them by only holding the end and leaving them open, they will vibrate in the magnetic field and won't demag properly, but will if you hold them closed and slowly move them away as you say up to a meter.

I would love to have the demag unit that is at my school, but as they cost £850 new I can see me staying with my $5 Chinese unit for a while yet.

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  you should still be able to find vintage watch de mags. on ebay .      if they don't work ,  it is a simple fix as its just a copper coil soldered to 110 volt, 60 cycle plug end -----  I DON'T KNOW  if they are diferent on UK  curent, but they sure work good in the US.  vin

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1 hour ago, Tmuir said:

Also when the hairspring is in place both ends of the spring are restrained which won't completely stop the vibration, but will limit it.

If you are de-magging a whole movement then try and do it running as not only are both ends of the H/S restrained from the motive influence of the field but the spring itself is moving independently of the magnetic field, further enhancing the efficacy of the method.

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Interesting stuff. I'm working on quite a tiny movement at the moment and I don't know if that has something to do with it. But when I demagnetise the movement, even though the hairspring is fixed in place and running, it is magnetising the HS. When it comes away from the demagnetiser it instantly forms a cone shape and the movement starts going super fast. It seems the only way to demagnetise this movement successfully is to remove the HS first and demagnetise it separately.

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