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Personally, I would be wary of re-pinning the stud and make the hairspring longer to compensate for the watch running fast, because it is more than likely the balance that has had weight taken from it when the poise screws have been shaved and removed weight from the balance which naturally will increase the timing, thus the index being all the way to one side to slow the balance down, Re-pinning the hairspring is going to change the pinning up point (where the spring passes between the regulator pins), but will also change the vibration rate of the spring slightly, which isn't the correct way to slow things down, unless it was incorrect to begin with, but to know that for sure you'll need a hairspring vibrating tool. This method will increase the timing, but I doubt it will run exactly at 18000 BPH anymore because of re-pinning the spring where it shouldn't ideally be. Adding timing washers is the way forward to alleviate this problem and slow the timing down, I believe. Having plenty excess of hairspring after the stud isn't a problem as long as it doesn't touch anything. -
By RichardHarris123 · Posted
I haven't done much hairspring work but isn't the terminal curve incorrect? -
As @Knebo suggests, the second coil could be hitting the regulator pin. I also think the coils could be bunched up on the other side to the stud and touching. I agree with @Nucejoe that it would be sensible to repin the stud nearer the end. It looks odd that there is so much hairspring protruding past the stud. What I'd do is remove the hairspring from the balance and repin the stud near the end. Then install just the hairspring back on the cock. You can then see if the collet is sat over the jewel hole, and make adjustments as necessary. (Depending on your skill levels, repinning studs and tweaking hairsprings can be tricky, but it's a good chance to practice and improve) -
This is not making your watch run minutes fast, but I would unpin the hairspring to repin the stud at the most end point of hairspring. When installed the coil looks bad. I'd be concerned if tg showed this watch running accurate, concerned that my tg might be feeling unwell. 🙃 Rgds -
The photo I posted was just an example to show how the camera connects to the microscope. I used to use a setup similar to that but I now use a mirrorless camera. When I did use that type of setup I didn't connect via USB, I just saved to the micro SD card.
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