Beat error correction

[tonydagee]

Hello all,

on servicing this Roamer st372 I noticed the stud is movable… and rotates within the assembly.My question is this:

Can this be manipulated directly to adjust beat error?

it doesn’t seem to be directly connected to the balance staff.

Help much appreciated….

TonY G

[oldhippy]

Simple answer is yes. That is how you put it in beat, just make sure the hairspring is free in the regulator if not you might kink the hairspring.  

[JohnR725]

19 minutes ago, tonydagee said:

it doesn’t seem to be directly connected to the balance staff

that's a rather confusing quote? The stud holder is holding of the stud which they hairspring is attached to. If you move this the entire balance wheel rotate and you can put the watch in beat. You want to be extremely careful though because beat does not have a plus or minus number and if you're not careful you will sail right past zero and be puzzled by why you can never put the watch in beat. It is usually best with no power to move the stud holder until watch looks like it's close to being in beat and then finish off with the timing machine.

 

[AndyGSi]

I presume from your comment that you've never come across a mobile stud carrier so this may help.

[praezis]

1 hour ago, oldhippy said:

just make sure the hairspring is free in the regulator if not you might kink the hairspring.  

Usually - in normal good condition - the regulator arm will move with the stud arm and that danger will not exist. 
But true, always the hairspring must be free to slide in the regulator.

Frank

[tonydagee]

Thanks for your help everyone.

I wonder…maybe just to be safe, open the boot at the regulator pins before the beat adjustment?  Is that a thing? Would it work?

[praezis]

Only needed if the hairspring is clamped in the regulator 

[nickelsilver]

56 minutes ago, tonydagee said:

Thanks for your help everyone.

I wonder…maybe just to be safe, open the boot at the regulator pins before the beat adjustment?  Is that a thing? Would it work?

That would entail two trips of the balance/cock out and back in, which is always good to avoid more than necessary. Also, if there is a boot, 99.999% of the time it's a flat hairspring, and the gap at the pin will be a bit larger than with no boot (overcoil spring), so no risk if the spring's regulating curve is properly centered.

[Nucejoe]

7 hours ago, tonydagee said:

Can this be manipulated directly to adjust beat error?

Its called beat adjustor arm.  

  Escapement is in beat when  impulse jewel  falls on a streight line drawn from balance to  escape pivot.

 

 

 

Edited November 18, 2024 by Nucejoe
correction

[tonydagee]

Thanks for your help everyone.

I wonder…maybe just to be safe, open the boot at the regulator pins before the beat adjustment?  Is that a thing? Would it work?

 

 

problem solved!

 Much appreciated everyone