Off-centered hairspring

[Dsplash]

Hi

I’m currently deep down into trying to figure out hairspring manipulation (I know it’s quite an important step…)

I kind of understand how to make the hairspring round or flat again but I commonly have a centering issue with overcoil hairsprings.

This one for example is an Omega 265 I feel I managed to get back into a correct shape but the collet is still slightly misaligned. I feel like the outer coil is in good shape and the issue should be in the transversal part but maybe Inm missing something entirely.  And I could not find a video showing how to deal with this issue so here I am

 

any tip on what I could try?

 

thanks!

 

[nevenbekriev]

ОК,

 

The red dot is center of the collet, the green dot is center of the bearing. The white line passes through this dots. The yellow line is bisector of the segment between dots. The pink dot is where the bisector crosses the outer coil. Now, bending in the pink dot will move the collet towards/from the bearing center. You must open (make more straight) the overcoil where the pink dot is in order to make centers coincide.

[mikepilk]

Firstly I would aim to get the collet centred in the hairspring, then adjust so it sits over the jewel hole.

From your pic I'm struggling to tell whether the collet is centred - does it open too quickly at the arrow? 
If so, a tweak near the pin should fix it.

If you need to adjust it, have a look in this lesson from the "Chicago School of Watchmaking" which explains how to adjust collets in hairsprings to get them centred.

chicago lesson 19.PDF

To get the collet over the hole (assuming the rest of the spring has been sorted), I just grab the collet and pull the whole spring in the direction it needs to go.

 

 

 

[praezis]

Nev‘s advice would be my first idea, too (or even changing the whole overcoil, as the straight sector is too short). However the coil is already almost straight there, more straightening hardly advisable.

But assuming the up-bend (the „knee“) is at the red arrow and realizing that the gap between coils is too wide there, I would first bend at the yellow arrow, the other end of Nev‘s yellow line.

It not yet enough, go to Nev‘s end of the yellow line.

Frank

[Dsplash]

Wow! Thanks for going all this way to help me!

ok, so first I followed Praezis’ advice to correct that red arrow and bring that point closer. I was also wondering if the collet was centered and I tried opening it a little. Thanks Mikepilk for that Chicago lesson document, I’ll keep it at hand in the future! How does the centering seem?

Then I used Nevenbekriev’s advice with drawing the bissextiles between the actual and ideal centers. Ended up changing the adjusting the final curve a couple times too… 

Here is where I am now :

- close when the regulator pins are in « A » position

- further away in « R » position

Now I know my end curve is not perfectly concentric and that explains the difference, but When I correct it it somewhat makes it worse

 

Thanks again for the help, love these puzzles somehow

[Dsplash]

Wow! Thanks for going all this way to help me!

ok, so first I followed Praezis’ advice to correct that red arrow and bring that point closer. I was also wondering if the collet was centered and I tried opening it a little. Thanks Mikepilk for that Chicago lesson document, I’ll keep it at hand in the future! How does the centering seem?

Then I used Nevenbekriev’s advice with drawing the bissextiles between the actual and ideal centers. Ended up changing the adjusting the final curve a couple times too… 

Here is where I am now :

- close when the regulator pins are in « A » position

- further away in « R » position

Now I know my end curve is not perfectly concentric and that explains the difference, but When I correct it it somewhat makes it worse

 

Thanks again for the help, love these puzzles somehow

[mikepilk]

Good job. 

To my eyes, the centre of the coil is about where the red dot is. So a tweak at either of the arrows (as per the Chicago School) should centre it.

It's not far off, and if you already have it installed , I'd run it and see how it performs.