Magnetized Case - is it possible?

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JerseyMo
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Magnetized Case - is it possible?

#1 Post by JerseyMo » Thu Dec 31, 2015 9:26 am

I had worked on this 1970 Timex Marlin maybe a year ago. While testing for continued operation and time keeping it would tend to just stop at random time settings. After fiddling with it some more it got tossed back into the projects pile. Last week I got back to it and decided to just swap out the movement with a known runner. Once I removed the old movement it took right off and ran through a full winding. Hmm that is odd...but I still swapped in a replacement. It ran for hours and stopped. Looking closely it appeared the sweep was touching the crystal. So a little tweak and off it goes running. Now it is going to work! Nope, again it stops and each time I see the hands are at different positions.

Just for the heck of it I pass the whole watch through the demagnetize - its been running "dead nuts" ever since....

Has anyone seen this before?
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stryfox
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Re: Magnetized Case - is it possible?

#2 Post by stryfox » Thu Dec 31, 2015 10:24 am

That is weird. I don't know.
I demagnetize all of them. Why? Because I bought a demagnetizer and figure it can't hurt.
Your not alone. I have had some that for the life of me I can't fugue out why they stop.
It's tricky because some of them as soon as you touch them they go.
Hard to diagnose when it won't stop when trying to figure it out.

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Nookster
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Re: Magnetized Case - is it possible?

#3 Post by Nookster » Fri Jan 01, 2016 11:29 am

I demag all my watches when I am done servicing them. You can normally tell when they are magnetized as the balance wheel will not move freely, but rather just kind of spin and stop and then start again.
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JerseyMo
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Re: Magnetized Case - is it possible?

#4 Post by JerseyMo » Fri Jan 01, 2016 3:36 pm

looks like I will be adding a demagnetize step to each of my repairs to mechanical movements.
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Nookster
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Re: Magnetized Case - is it possible?

#5 Post by Nookster » Sat Jan 02, 2016 5:36 pm

You can get them cheap, just search around, not expensive
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Literustyfan
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Re: Magnetized Case - is it possible?

#6 Post by Literustyfan » Tue Jan 12, 2016 6:00 am

I demag everything, that is step one.

I use a CHEAP compass to test if the movements have a charge, it's about the size of a quarter.

Simply run the movement past the compass, off to the side of it by about a half inch.

After you demag just run it past the compass again to see if you got the charge out of it.

Probably the cheapest tool in my shop, this compass costs about 10 cents.

A compass that is NOT filled with water seems to work better.

Image

I have bought 2 demagnetizers over the years and I was not happy with them, did not work too well.

Decided to go with something a bit more industrial, not exactly cheap but this puppy rocks!

Image
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Paul_S
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Re: Magnetized Case - is it possible?

#7 Post by Paul_S » Tue Apr 19, 2016 7:19 am

Totally possible---happens all the time.

Magnetism is a plague when you consider all the electronic devices around us as well as what a packahe goes through when it gets shipped to us.

I demagnetize watches and parts before working on them. Tweezers and other tools get a zap, too.
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Captain Crandall
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Re: Magnetized Case - is it possible?

#8 Post by Captain Crandall » Mon Oct 03, 2016 1:14 pm

Literustyfan wrote:I demag everything, that is step one.

I use a CHEAP compass to test if the movements have a charge, it's about the size of a quarter.

Simply run the movement past the compass, off to the side of it by about a half inch.

After you demag just run it past the compass again to see if you got the charge out of it.

Probably the cheapest tool in my shop, this compass costs about 10 cents.

A compass that is NOT filled with water seems to work better.

Image

I have bought 2 demagnetizers over the years and I was not happy with them, did not work too well.

Decided to go with something a bit more industrial, not exactly cheap but this puppy rocks!

Image
You can use one of these with wrist watches ? I've seen these for sale but most of the time they state "This unit is for industrial use, not for watches", are these safe to use on watches ?
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