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Beat error

BUSAKAZ

By BUSAKAZ
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clockboy Distinguished Member

clockboy

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OK the spring touching in the centre will account for the watch running too fast. My method to adjust is I use a pin & a microscope. This is very a delicate alteration one slip & the spring could be finished so take your time. The other issue is the tight balance staff so before refitting the spring fit the balance to see how much end shake if any you have. The correct way to reduce the length of the staff is to use a jacot tool. Another method that I have come across is a slip of paper is used as packing under the bridge.

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BUSAKAZ WRT Addict

BUSAKAZ

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45 minutes ago, clockboy said:

OK the spring touching in the centre will account for the watch running too fast. My method to adjust is I use a pin & a microscope. This is very a delicate alteration one slip & the spring could be finished so take your time. The other issue is the tight balance staff so before refitting the spring fit the balance to see how much end shake if any you have. The correct way to reduce the length of the staff is to use a jacot tool. Another method that I have come across is a slip of paper is used as packing under the bridge.

thanks, who said the balance staff was tight its not tight it's spinning at 353 now I have slackened of the train bridge, just need to sort out the spring now I have seen the problem.

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BUSAKAZ WRT Addict

BUSAKAZ

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17 hours ago, clockboy said:

If you can not tighten down the bridge then the staff is tight.

the reason for low amplitude was I somehow over tightened the gear train as soon as I released the pressure the amp started to rise that was that problem sorted, the next job is the distorted hairspring the balance staff is not tight, I have had it in the watch with the spring and pallet fork removed and it spins freely, I have also examined the pivots under the microscope and they are polished and in perfect condition, now I have seen the shape of the spring the problem lies here just need to manipulate the spring the all should be fine.

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Scouseget Watch Enthusiast

Scouseget

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I don't know if this is petinent or not but I've noticed that sometimes when a watch is in beat, but you subsequently adjust the regulator to improve its timekeeping, the beat error changes. Thinking this through, it seems logical to me as if the regulator pins are gripping the over-coil somewhat tightly, then the effective length of the hairspring has changed and its neutral position will also change, leading to a change in the beat error. However:

  1. Does the above make sense?
  2. What if the overcoil isn't actually being gripped by the regulator pins but is freely centred between them as it should be, gently bouncing from one to the other as the balance wheel rotates?
  3. What happens if the radius of the overcoil isn't correct so that it always rests on only one of the regulator pins, could this cause a change in beat?

Or am I out to lunch on this altogether? 

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Marc Distinguished Member

Marc

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1. Yes and no. If the regulator pins are gripping the h/s then when you move the regulator you will alter the neutral position of the balance. However, this will be the least of your problems. Moving the regulator to shorten the h/s and increase the rate will either break the h/s or pull it out of the stud. Moving it the other way to reduce the rate will buckle the h/s between the regulator and the stud. Either way you will destroy the h/s.

2. This is how the regulator is supposed to be set up. In this configuration moving the regulator does not affect beat error.

3. In this configuration the h/s will be distorted out of concentric which can induce beat error. As such moving the regulator can change the beat error as the distortion changes but the effect will be unpredictable.

 

You should aim to have the h/s and regulator set up as in 2. before you attempt to adjust either beat or rate.

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BUSAKAZ WRT Addict

BUSAKAZ

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7 hours ago, Scouseget said:

I don't know if this is petinent or not but I've noticed that sometimes when a watch is in beat, but you subsequently adjust the regulator to improve its timekeeping, the beat error changes. Thinking this through, it seems logical to me as if the regulator pins are gripping the over-coil somewhat tightly, then the effective length of the hairspring has changed and its neutral position will also change, leading to a change in the beat error. However:

  1. Does the above make sense?
  2. What if the overcoil isn't actually being gripped by the regulator pins but is freely centred between them as it should be, gently bouncing from one to the other as the balance wheel rotates?
  3. What happens if the radius of the overcoil isn't correct so that it always rests on only one of the regulator pins, could this cause a change in beat?

Or am I out to lunch on this altogether? 

if you go on youtube and type in hairspring adjustment 01 by perplxr all will be revealed.

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