Watch goes real fast

[Nickkiwi]

Hi guys, I am new to the forum.

Recently I serviced a watch. On the timegrapher it shows perfect timing in all positions, but in reality it goes real fast - 4-5 hours a day.

I can't explain this. Help me if someone can please!

[mbwatch]

Hi and welcome. Is it possible your minute hand is touching the hour hand and nudging it forward at some place on the dial before freeing itself then coming around again in an hour to push the hour hand a little farther? (guess from a fellow amateur)

[HectorLooi]

Did you check the watch when all cased up and in all 6 positions?

Sometimes when the movement is cased up, something presses on the balance bridge or hairspring and upsets the rate. The hairspring might be out of flat and when the watch is placed in a certain position, it touches something.

What timegrapher are you using? Is it a pc based software timegrapher? 

[nevenbekriev]

Well, It may be hairspring sticky, ad it can stick and unstick in different moments, but then You will be able to put the watch on the timegrapher and see it goes too fast when hairspring sticked and OK when it is not.

There is another, more probable situation. Do You know if the watch has worked before normally? The balance/ hairspring assembly may have been changed and with one from a movement from hte same familly but with different, faster BPH. Then, the timegrapher will autodetect the balance BPH and show good flat line, but the watch will work much faster. You can observe the second hand of the watch while it is on timegrapher and shows correct flat line with small timing error, and see if it makes full revolution for exactly one minute.  Thus You will be able to understand what happens

[Neverenoughwatches]

26 minutes ago, nevenbekriev said:

Well, It may be hairspring sticky, ad it can stick and unstick in different moments, but then You will be able to put the watch on the timegrapher and see it goes too fast when hairspring sticked and OK when it is not.

There is another, more probable situation. Do You know if the watch has worked before normally? The balance/ hairspring assembly may have been changed and with one from a movement from hte same familly but with different, faster BPH. Then, the timegrapher will autodetect the balance BPH and show good flat line, but the watch will work much faster. You can observe the second hand of the watch while it is on timegrapher and shows correct flat line with small timing error, and see if it makes full revolution for exactly one minute.  Thus You will be able to understand what happens

I guess nikki could compare the tg bph with a listed bph of that movement.

[nevenbekriev]

12 minutes ago, Neverenoughwatches said:

I guess nikki could compare the tg bph with a listed bph of that movement.

Yes, if He knows the exact calibre number. But then exists another oportunity - the train gears to have been changed from a donor wit slower BPH.

[oldhippy]

Have you demagnetized the whole movement and the tools you have been using? Make sure the hairspring is clean and the coils are not sticking to each other, is the hairspring free in the regulator and not rubbing on anything. Do you have the correct mainspring in its barrel. Try running the movement out of its case for 24 hours to see what happens.

[Nucejoe]

1 hour ago, nevenbekriev said:

Well, It may be hairspring sticky, ad it can stick and unstick in different moments, but then You will be able to put the watch on the timegrapher and see it goes too fast when hairspring sticked and OK when it is not.

There is another, more probable situation. Do You know if the watch has worked before normally? The balance/ hairspring assembly may have been changed and with one from a movement from hte same familly but with different, faster BPH. Then, the timegrapher will autodetect the balance BPH and show good flat line, but the watch will work much faster. You can observe the second hand of the watch while it is on timegrapher and shows correct flat line with small timing error, and see if it makes full revolution for exactly one minute.  Thus You will be able to understand what happens

Good point nev, I found slow-mo video of the oscilator helpful to see intermittent sticking of hairspring.

Running six hours fast is more likely to be a case of faster beater oscilator though.

Rgds

Edited November 8, 2023 by Nucejoe

[Neverenoughwatches]

2 hours ago, Nucejoe said:

Good point nev, I found slow-mo video of the oscilator helpful to see intermittent sticking of hairspring.

Running six hours fast is more likely to be a case of faster beater oscilator though.

Rgds

I'm interested to know what makes a faster beat oscillator , a stronger hairspring? 

[Marc]

52 minutes ago, Neverenoughwatches said:

I'm interested to know what makes a faster beat oscillator , a stronger hairspring? 

Stiffer hair spring, shorter hair spring, lighter balance wheel, smaller balance wheel, moving the mass distribution of the balance wheel closer to is axis.

 

[JohnR725]

17 hours ago, Nickkiwi said:

Recently I serviced a watch. On the timegrapher it shows perfect timing in all positions, but in reality it goes real fast - 4-5 hours a day.

It really would be nice if you gave us more information. Otherwise everybody gets to guess. Like exactly which watch did you service. What exactly did servicing consist of and can we see the timing machine results.