doxa eta 1080

[gary17]

hey

I finished cleaning and oiling a doxa with a 1080 movement in it.I have left it for 3 days and it had gained approx 30 seconds during that period.

So i thought i better start learning how to read this weishi timer gizmo. The movement is out of the case so i mounted it and waited for reading.

I set lift angle 52 degrees and set test time to 60 secs.

Now it picks up the autobeat but then goes off as if its not picking up a beat but the watch is going. Just before it goes off, the screen shows beat rate as ++++ nothing else and the next reading i believe the lift angle also shows ++++ the other 2 are blank as it dont get that far.

I have tried 2 other watches on the timer and the gizmo reads then fine.

ant one any ideas.

cheers

gary

[gary17]

Update

Just managed a 12 sec on on the timer and this is what it shows.

Sorry pics aint great but i had to be quick before it went oiff

[watchweasol]

Hi Gary  I would fit the movment into the case and try again, Not getting a consistant signal as it drops out.

[gary17]

Hey

Yer tried that and its the same. I am now noticing it seems to beat 5 times misses a beat and continues. Other times it beats 5 times and stops. I have checked the escape and it looks fine. yer beat is irregular, i could not hear it before as i had it on mute.

What will be causing that if not the the escape is thye next thing to look at the mainspring???

Am i looking at the wrong parts.

cheers

gary

[watchweasol]

First off look at the Fork for loose jewels/impulse pin  then the escape wheel for damaged teeth. The mainspring supplies the power via the train also check the train wheels for damaged/ missing teeth.  cheers

[JohnC]

You may also want to check your hairspring isn't rubbing on anything. If there is a big overlapping centre wheel (as I think there is on this movement), check that the hairspring isn't hung up on that. Also check the condition of the balance pivots if you didn't before.

[gary17]

Hey

Thanks for advice but im calling it a night. I have another 1080 movement here (Working fine) and when i swap pallet and escape wheel and balance its still the same.so tried a 1093 movement parts and guess what ditto the same. Its missing a beat.

The other 1080 and 1093 both run fine on the timer.

So guess tomorrow i will have to mix bits up and see what happens.

cheers

gary

[gary17]

Hey

I may have found something. The seconds wheel (the big wheel in the center) is shaped like a donkeys hind leg. I decided to removed train bridge again and run it through by hand. The seconds wheel is not true. So its fine on one side it turns the escape wheel fine but then it dips and misses the escape wheel. So i will let you know if that solves it.

Once again thanks for help.

cheers

gary

[gary17]

Hey

Right it now does not stop and i get a full reading.

But i do not know were to start with these results.

Suggestions please. (polite ones)

cheers

gary

[jdm]

 

14 hours ago, gary17 said:

Right it now does not stop and i get a full reading.

No you don't. The snowing screen and the +++ tells you that the beat is so erratic that the machine can't give any meaningful figure. It may have determined the beat rate and amplitude occasionally,  but that's all.

Quote

But i do not know were to start with these results.

From the usual troubleshooting basics: mainspring is good and strong, train is free and aligned, escapement even more of the same, hairspring, balance, and its jewels look absolutely right at any level of magnification.

It is only with certain minor faults that the pattern can tell you what is wrong with good certainity. But on a barely running mov.t like that you must diagnose using your eyes, ears and hands, just like one or four hundreds years ago.

[gary17]

Thanks.

I hink i know what wrong its the central wheel. I will swap it and see if i am right

[gary17]

Now got doxa going (1080 eta) the weishi timer shows no rate.    127 amplitude 

0.5 beat error and parameters are 18000 or 52 degrees. But it still looks like a snow storm but now a light fall snow fall. Do I need to look at mainspring next? 

Them readings have now been steady for 90 min

Cheers

Gary

[watchweasol]

Hi Gary  It would be helpfull for members to see the screen on the timegrapher, could you post a picture please      Thanks.

[jdm]

1 hour ago, gary17 said:

Now got doxa going (1080 eta) the weishi timer shows no rate.    127 amplitude 0.5 beat error and parameters are 18000 or 52 degrees. But it still looks like a snow storm but now a light fall snow fall. Do I need to look at mainspring next? 

A new mainspring on such an old watch is always beneficial but may be wasted and disappoint you in case doesn't solve the problem. I think it's more likely that something in the escapement or balance and hairspring is faulty. 

[gary17]

Hey

Yer it shows the danger of buying donor watches. I have now noticed it misses beats when at different angles on the weishi. 

The thing is now the 2 donor watched are useless cos the parts for my watch are duds how many other parts are duds also. 

Another lesson learnt the hard way. 

Thanks

Gary

[jdm]

2 minutes ago, gary17 said:

Yer it shows the danger of buying donor watches. I have now noticed it misses beats when at different angles on the weishi. 

The thing is now the 2 donor watched are useless cos the parts for my watch are duds how many other parts are duds also. 

If parts are truly faulty then you have a problem for sure but I learned at my expense that one can have the same exact problem of horrible amplitude even when fitting brand new parts. All it takes is the hairspring rubbing ever so slightly, the endshake being insufficient here or there, or a bent pinion perhaps.

[gary17]

What's annoying is its keeping perfect time. It looses about 20 secs a day. 

 

[jdm]

4 minutes ago, gary17 said:

What's annoying is its keeping perfect time. It looses about 20 secs a day. 

Steady on the bench, that is. Wear it a week and let us know at the end.

[gary17]

Yer probably right i will give it a go

[gary17]

Hi

me again.

Jdm was right 1 day i wore the watch and well it was kaput. So i took the balance of and stripped it down lined up the roller put the hairspring in place after playing with it for hours, attached to the cock and i am now getting no interuptions to the beat. and these results on timer. Have i actually achieved a better working watch or wasted me time.

Is it worth me carrying on with the watch or give in. It cost me £8.50 so you can see my dilemma

I think i know the answer.

cheers

gary