Unitas 6376

[tonydagee]

Hello all.

some help required here from the community please.

I serviced this movement, which was running reasonably well, but the balance spring which was running healthily before I started, after cleaning in hexane for 30 secs, is all bunched up at the stud.

I did store the balalance on a tack thereafter for a day.  

could the spring be strained under gravity? I demagnetised of course, and the balance is squeaky clean.

some help would be much appreciated. Thanks, Tony G

 

 

[nickelsilver]

It's either bent or hung up on something or both. The hexane won't hurt it, and hanging from a balance tack indefinitely won't hurt it.

 

If the spring is glued to the stud there's a chance that the glue was softened and the outer coil stuck to the stud. Haven't seen that happen, but I suppose it could. Don't know if hexane affects the glue used either.

[praezis]

What is this (left of the red line)? hairspring?

Frank

[mbwatch]

It would help a lot to see a picture of the balance cock removed and on its back with the balance pivot in its jewel hole.

From this view we can't even rule out the outer hairspring coil being hooked on or under the stud.

[tonydagee]

I didn’t find any anomaly to the left of the red mark…reflection?

this is the balance in its pivot in the inverted assembly.

i can’t see any obvious kinks  and the spring is flat as far as I can see. Either the stud screw is missing, or it’s glued in… I don’t know. I’m loathe to fiddle with it.

Any further insights? Thanks!

[Nucejoe]

Coil not centered to begin with, looks it has fouled itself. 

Edited Saturday at 07:11 PM by Nucejoe

[VWatchie]

I’m having a hard time seeing exactly what’s going on, even when I zoom in as much as possible, but it kind of looks like the hairspring has gotten itself tangled up.

How does the spring look when you place the balance cock on your balance tack? Tangled?

[Kalanag]

The white circle shows the expected radius of the „golden curve“.

The red arrow points to where the hairspring is kinked most likely.

 

[tonydagee]

I didn’t find any anomaly to the left of the red mark…reflection?

this is the balance in its pivot in the inverted assembly.

i can’t see any obvious kinks  and the spring is flat as far as I can see. Either the stud screw is missing, or it’s glued in… I don’t know. I’m loathe to fiddle with it.

Any further insights? Thanks!

[nevenbekriev]

The stud screw is shared off, or it is missing. You have to remove (to press out) the stud from the stud carrier. This means to support the end of the stud carrier on the edge of something while holding the cock in a manner that the balance will be free to fall down and to press on the stud with proper tool. But I don't expect the balance to fall, as the spring is possibly wrapped above the cock. So, if this is true, try to gently "unscrew" the spring or in some other kind manner to release it, then show pictures of the damages. If it is still OK, then consider it as a miracle.