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Lc130

Bent hairspring

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This is a Bifora 115.  I accidentally snagged the the hairspring with tweezers.  I believe that the highlighted area is now bent??  Balance now swings slowly if at all.  I've watched Mark's videos on straightening HS.  Though I'm a beginner and never attempted this.  Any advice is appreciated.

 

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For bends in the round the correction is always made 90 degrees from the problem area. In the pic below you can see the kink, blue arrow, which is actually 90 degrees from the maximum out of round. If you bring the spring back toward the staff there you will already be very close to good.

hairspring2.jpg

Edited by nickelsilver

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Tricky... I would say.. gently grip at "A" with a pair of fine nosed pliers and gently massage opposite "B" (with a pin, needle, very thin screwdriver or a second pair of pliers) to push bend in the direction of "B", rinse, repeat until all of the coils are evenly spaced and concentric once more.

I'm slightly suspicious that all is not quite correct at "C" too, but I could be wrong.
 

I tend to perform this kind of gentle hairspring tickling with the balance in the watch, but the more professional method involves poising the balance on a special tool designed for this, which allows better access all round the hairspring. .

Be careful, patient and observe the results of each manipulation, so that you can see what even the smallest of tweaks does to the whole hairspring. I have spaghetti-iesd many hairsprings in my youth, so I have a bit of a feel for what is involved, but you will need patience, good magnification, good light, and a steady hand... and even more patience.

HairSpring2.jpg

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I'll add that you'll want the regulator out of the way when adjusting, or take the spring off the balance and remount to cock, then it's easy to see when you've got the collet centered over the jewel and also the the regulating curve matches the arc of the regulator.

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2 hours ago, nickelsilver said:

For bends in the round the correction is always made 90 degrees from the problem area. In the pic below you can see the kink, blue arrow, which is actually 90 degrees from the maximum out of round. If you bring the spring back toward the staff there you will already be very close to good.

I'm trying to use Mark's video as a guide.  Where would I grip and where and in what direction would I push?  Thank you.

 

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You need to take apart the spring from the wheel first. Because the spring is out of shape. It have to be round centered on the wheel pivot. It needs excessive care and patience... I personally do that with no removing the spring from the cock...  Only taking apart the wheel...  

Then, you just rub the spring very gently until to see the center on the hole.  After many little touching and rubbing  the spring, you finally will realize true sides of touches to make it centered. Then slightly harden your touches in the right direction to take the spring in shape. Not in one time.... slightly increase the power of your touches in many times... At least this was my first beginner method...  It's been so useful for me. 

Unfortunately, Only watching the videos is not enough to achieve it...  You have always to take a risk as a beginner... Just have steady hands, well tweezers, patience and a good vision.... 

Good luck !... 

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The correction which will make the maximum effect will be adjacent to the stud. That will pull the coils concentric about the staff, enough so to allow the balance to run again. Don’t remove the Hs from the staff unless your competent to reinstall and reset the beat. This looks much worse than it is. Don’t be too keen to rush in, just a gentle tweak at the stud will fix it.


Sent from my iPhone using Tapatalk

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I'm fairly certain that I made it worse.  Any ideas for correcting it.  I'm lost.  Current state is pictured below.

This is a Bifora 115/1.  If I have to replace it and assuming I can't get a donor , Cousins lists parts for "115" and "115.1"

For 115.1 they have "Balance Complete, Ordinary, Bifora 115 721"

For 115 they list the above and "Balance Complete, Shockproof, Bifora 115 721.1"

Are either of these the correct part and what constitutes "complete"?

Thank you

 

 

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Hi Lc   Looks pretty bad . best thing to to is remove the spring from the balance and the balance from the cock lay the spring on the cock centered over the jewel hole then carefully stroke the spring back into the round removing the kinks as you go. Its a time consuming job care and patience are the watch word.   In the case of Balance complete, It comprises of the balance wheel with balance spring fitted and timed complete with stud ready to attach to the balance cock  and put into the movement. No adjustments needed other than slipping it into the regulator. Might be the quickest option.

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