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Strange behaviour from a freshly serviced Seikomatic

Fraczish
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Fraczish Watch Enthusiast

Fraczish

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Evening all!

Yesterday I received back from service a Seikomatic 6206B Automatic Movement.

As It had no manual wind function I built up the power by gently rocking for 3 or 4 minutes. I always like to put them on the timegrapgher when they come back, but this time the machine wouldn't even recognise the beat.. 1st inclination something wasn't right. 

I wore it for the rest of the day and it seemed to gain alarming amounts.. 10+ mins.

I recorded the time before going to bed placing the watch dial down. This morning the watch had lost only 10-15secs, not too bad..

I placed it back on the timegrapgher and it picked the beat up straight away... Some position deviations but nothing to worry about.. horah I thought..

For the rest of the morning I continued to wear it and record the rate, it lost a few seconds but was functioning properly. However as the day went on I noticed it gained alarming amounts one more. As it sits on my wrist now it's currently 11mins fast. (See attached pic)

I'm obviously going to send it back to the watchmaker to check over, however as I'm new to working with watches I thought it might be a question that someone might be able to put a theory to. Just to help my learning.

Apologies for the length of this post!

 

Screenshot_20200530_181116.jpg

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Fraczish Watch Enthusiast

Fraczish

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27 minutes ago, watchweasol said:

As you rightly say "its going back to the watchmaker,".  sounds very much like a balance/balance spring problem.  touching coils, catching the cock or plate   

Certainly will be, can't fault him to be honest, he's been excellent help over the years. 

It almost seems like as the power reserve builds it speeds up significantly.. yet as it runs down it returns to normal. Could bit be mainspring related?

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Walsey Member

Walsey

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I've had similar behavior when the cannon pinion is really loose, where any jolt to the watch would cause the minute hand to move around.  The watch would loose or gain a lot of time, but always look good on the timegrapher.  The same thing goes for a loose minute hand.  If you set the time to midnight are the minute and hour hands stilled aligned?

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Fraczish Watch Enthusiast

Fraczish

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6 hours ago, Orologi67 said:

Demagnification possibly??

This was my first thought, I demagnitised it. No change.

5 hours ago, Walsey said:

I've had similar behavior when the cannon pinion is really loose, where any jolt to the watch would cause the minute hand to move around.  The watch would loose or gain a lot of time, but always look good on the timegrapher.  The same thing goes for a loose minute hand.  If you set the time to midnight are the minute and hour hands stilled aligned?

The hands do align as they should.

Thing is it's following a very regular pattern of irregular behaviour if that's a thing haha!.. again this morning it had only lost a few seconds overnight and having tested it again just, it's not gaining or lossing very much at all. It will be interesting to see as the day goes on and the power reserve builds back up if it starts to rapid gain once more.

Thanks all, I will update later :thumbsu:

 

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