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magnetism

ramrod

By ramrod
in Watch Repairs Help & Advice

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ramrod Super WRT Addict

ramrod

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i've got a question about magnetisn in watch movements. if a watch movement is magnetized, is it most likely the hairspring assembly that is affected? the reason i ask is that i have a seiko 7s26-7020 diver that i suspect has been magnetized. it runs like a house afire! i have several used 7s26 movements coming to me in the mail, and i was gonna swap out the escape. i do not have a demagnetizer. i DO plan on getting one, but i wanted to try this fix to see if it would work.

actually now that i'm thinking about it, i might just swap in one of the movements that i'll be getting this week. but i will try swapping in a newer escape for now.

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jdm Distinguished Member

jdm

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Despite what is often repeated like a mantra, do not count too much on magnetism to severely accelerate a modern Seiko movement. More likely an hairspring issue, however to tell more you would need to share timergrapher pictures here .

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oldhippy Distinguished Member

oldhippy

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Any foreign body on or in the hairspring can cause irregular time in any watch movement, it isn't just magnetism. Invest in a  demagnetizer there not very expensive. This bit I've said many times on here (demagnetize the movement to repair first)  

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rogart63 Distinguished Member

rogart63

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Just now done some tinkering with a 7S26 movement. It was running very good but didn't have a great amplitud? But couldn't get it to run better? So  sent it to the owner? That wore it for a day. He said it suddenly runs several minutes to fast. So took it back. Demagnitized it and it runs good for a few minutes and snowstorm and then runs good again. But all it needed was a little push on the hairspring between regulator and the movable stud . And it runs like a star? Wrong lift angle maybe. Should be 53 i think . 

They sure are tricky to adjust the Seiko movements? 

DSC06711.JPGDSC06710.JPG

Edited by rogart63
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ramrod Super WRT Addict

ramrod

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i guess it's the first thing i assume. i will get a demagnetizer. when i get the new movements i will switch out the balance to see if it works. this watch runs beautifully despite it's speed.

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jdm Distinguished Member

jdm

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6 hours ago, ramrod said:

i guess it's the first thing i assume. i will get a demagnetizer. when i get the new movements i will switch out the balance to see if it works. this watch runs beautifully despite it's speed.

In reality you can't know how it runs without looking to the timegrapher or equivalent application.

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    • Waggy
      B-Dip residue?

      By Waggy · Posted

      Forgot to mention that only demagnetize a balance when its in the movement, otherwise the magnetic field will snatch the coils and damage them
    • HectorLooi
      B-Dip residue?

      By HectorLooi · Posted

      Sometimes a sticky hairspring might unravel after using a demagnetizer. But if you push the coils until they touch, they will stick together again. I find that brushing the coils gently while submerged in naptha the most effective way to cure a sticky hairspring. Sometimes it requires 2 or 3 washes to cure it. I often wondered what causes a hairspring to become sticky. The 9010 in the jewels are unlikely to drip onto the hairspring. The other possibility is the 9415 on the pallets. But then that's on the other side, below the balance. Can it "splash" onto the hairspring?  Looking at the stickiness and tenacity, I'm leaning towards 9415.
    • Waggy
      B-Dip residue?

      By Waggy · Posted

      I was about to ask the same question, it sounds a lot like magnetism which is a quick fix (assuming you have access to the correct tool) and ideally something you should do anyway.
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    • ManSkirtBrew
      Picked up on a whim: Arnex 17 jewel pocket watch with Unitas 6498 movement

      By ManSkirtBrew · Posted

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