Roamer running about 10 minutes fast a day. MST 371 movement

[Eliminator]

Hi,

Demagnetising it has made no improvements.

To my novice eye the hairspring appears to be kinked before it meets the regulator stud Would this make the watch run fast?

I go through periods of enthusiasm and doldrums when working on movements.

I'm definitely a beginner, my best success was a non working Precimax, that I diagnosed as having a loose canon pinion. I managed to tighten this, after buying a set of precision pins, used one inside the bore, to stop the chance of overdoing it. I then used a blunted pair of nail clippers. ( Don't laugh)

Taken watches apart, cleaned and oiled them. ( some I've taken apart, cleaned, and err not put back together yet.) This just gives you some idea of my beginner status.

The idea of "correcting" a hairspring fills me with horror. If / when I muster the enthusiasm.

The dial photo was taken with my phone, second photo was of the screen of my digital microscope. (hence the poor quality)

I have launched parts into orbit.

Got frustrated and walked away.

[JohnR725]

2 minutes ago, Eliminator said:

To my novice eye the hairspring appears to be kinked before it meets the regulator stud Would this make the watch run fast?

Yes this is why the watches running fast. That's because they hairspring is not straight and The spring gets pulled out has artificially shortened the spring hence the reason is running fast so that needs to be straightened out if you wanted to keep time

4 minutes ago, Eliminator said:

The idea of "correcting" a hairspring fills me with horror. If / when I muster the enthusiasm.

The problem with how your learning watch repair is your learning on live patients. Just think of doctors did that instead I going to school they go straight out the clinics and hospitals. You might be the first patient they decide to do surgery on I wonder what the worst that could happen would be?

Maybe a better approach would be practicing on something that's disposable that you have no intention on repairing. There usually is a lot a cheap junkie watches on eBay that you can purchase movements whatever balance wheel sometimes practice bending hairsprings

we get good at anything in watch repair is practice and the best practice is repeated practice on stuff that's disposable not live patients.

Then that bent part of the hairspring is relatively easy to fix. Versus all sorts of other bad things you could have done but it really would be nice if you practice on something else.

[Eliminator]

I do have a few Slava movements, that I bought for spares, as they were irresistibly cheap.

[JohnR725]

2 minutes ago, Eliminator said:

Slava movements

I really should label the little marks down below but I'm just doing something really fast. Where the spring has been bent out that's just about where it's bent sort of its also bent at the stud the classic place where things get bent hairspring.

Day choir practice movements and go in and just gently pull out in the exact same location you would even need to grab it with the tweezers just push it out and see if you can simulate what you see here then you can try pushing it back in again. Now the reality is you may have to grab the tweezers and gently squeeze the whole thing to get it to go back but try some techniques and if you have a few spares deliberately destroy one just because. Then you'd you got that out of the way it now you can go back to practicing.

The other thing you'll notice is the cause of that bent is the opera Mark notice how much spacing of the hairspring coils versus the other mark? This is because of just what's there has changed the centering of the hairspring. As I said it should be relatively simple to fix but try simulating on the practice watches try fixing on the practice watch and then you can Come back to this one with better idea of what's going to happen. Plus you can also try twisting the hairspring at the stud to see how it knocks it out of level you can try twisting it back again. All things that might somehow accidentally occur when you removing a balance wheel. Then yes classically the stud is the most popular place to have a problem with the hairspring

 

[Eliminator]

Day choir practice movements? Lost me there? Too fast with the typing?

[JohnR725]

12 hours ago, Eliminator said:

Too fast with the typing?

What makes you think I know how to type? True I took touch typing a very long time ago but I don't type at all the most part I use dictation software otherwise well it be very unreadable if I typed it by hand and I just wouldn't do it. But dictation software gets unhappy with me and whale that can be an issue so let me pop up and see what the heck it did

okay it's quite simple it just says your practice movements and skip over the garbage in the beginning. In other words take your practice watch and gently pull the hairspring how it's the same place as the real watch and see what happens then see if he can put it back where you found it.

[Nucejoe]

Heres how a flat coil should look, IN or OUT  of the watch, it must be CENTERED,FLAT & LEVEL parralel to the balance rim.

https://www.zeitwinkel.ch/detail/the-importance-of-the-hairspring.html

Most coils must be studded and often a bend near the stud is necessary to get the end curve in regulator arm's  boot-pin .

In the picture, John has shown where a fault is in your coil, which must be sorted out ,in addition all above mentioned criteria be met. 

Good luck.

 

 

 

 

 

 

 

Edited September 4, 2024 by Nucejoe
Adding the link

[nevenbekriev]

Actually it is only the final curve and it needs attention on 3 places shown with arrows.

I would correct all without taking the balance out of the movement, but for newbie it will be easier to remove the balance and to remove the spring from the balance.

But my advice is not only to try on practice movements, but start with alarm clock hairsprings. You will need to understand how the hairsprings behaves when manipulated and how to choose the correct place and way of manipulation first and it is easier to start with big springs. Then only move to smaller ones like pocket watches and then wrist.

[Nucejoe]

2 hours ago, nevenbekriev said:

I would correct all without taking the balance out of the movement, but for newbie it will be easier to remove the balance and to remove the spring from the balance.

Nev, I can sort it out with one eye shut .

Can you ?    lol   

[nevenbekriev]

17 hours ago, Nucejoe said:

Nev, I can sort it out with one eye shut .

Can you ?    lol   

It is funny, but if one works  with loupe on one eye, then the other eye is not used. So yes I can, thow i have noticed that I don't close the other eye, just information that comes from it is ignored by the brain.