Jump to content

Timegrapher Interpretation


Recommended Posts

That's obviously an issue, it's not on a full wind at the moment. I think I may have put too much braking grease in the barrel and the spring may be slipping too easily.

I am wondering what the shape of the top line may signify. Problem with one of the pallet jewels perhaps?

Stephen

Link to comment
Share on other sites

47 minutes ago, chadders1966 said:

That's obviously an issue, it's not on a full wind at the moment. I think I may have put too much braking grease in the barrel and the spring may be slipping too easily.

I don't think that the MS is slipping. Do not assume always that poor amplitude is due to the MS, in my experience, in most cases, it is not. Reference article  http://watchguy.co.uk/service-allaine-felsa-1560/

  • Like 1
Link to comment
Share on other sites

19 minutes ago, rodabod said:

The cycle of sooner and later for one of the pallets looks around 15 beats long.... Is the escape wheel looking ok? I'd maybe have a look under close magnification. 

As mentioned before, with 100 deigree less than the normal amplitude, pattern has no significance.

Link to comment
Share on other sites

No cracked jewels, damaged pivots, pinions or wheels that I can see under magnification. I think the mainspring may not be connecting properly. It is one of this with a seperate bridle, and I'm wondering if the hook is not catching and the spring not getting full tension.

Stephen

Link to comment
Share on other sites

From the pattern id say its either one of the following or a combination >

Pallet stone loose/damaged

Escape wheel pivot bent / Damaged Escape wheel tooth

Usually when an escape wheel pivot is bent both lines will form a wave pattern in a regular fashion, this has only a single line and whilst it could still be an escape wheel issue id start by looking that the pallet stones are fixed correctly.

There are a few other things which can cause the pattern but i think the above is most likely :)

Link to comment
Share on other sites

36 minutes ago, MrBeat said:

From the pattern id say its either one of the following or a combination >

Pallet stone loose/damaged

Escape wheel pivot bent / Damaged Escape wheel tooth

Usually when an escape wheel pivot is bent both lines will form a wave pattern in a regular fashion, this has only a single line and whilst it could still be an escape wheel issue id start by looking that the pallet stones are fixed correctly.

There are a few other things which can cause the pattern but i think the above is most likely :)

As mentioned before, with 100 degree less than the normal amplitude, pattern has no significance.

Amplitude is the first and foremost paramenter to be looked on the timegrapher. No correct timekeeping can be had below 200 deg.

 

 
 

 

 

 

Edited by jdm
  • Like 1
Link to comment
Share on other sites

Well I re-inserted  the maispring and the amplitude is now 250-270 dial up/down, 220 pendant up/down. I do believe the wave cycle on the timegrapher did have a cause, and it was the escape wheel. The wheel itself is fine, but I realised I'd put the escape cap jewel on upside down - whoops!

The beat error is still a problem, but not as much. It's 0.8 DU/DD, 1.4 PD and 0.4 PU. I did observe the balance jewel and it appeared to be pretty well centred in line, where to look now? Thanks

Stephen

Link to comment
Share on other sites

Since you don't have a beat adjuster on the regulator, you will have to revove the balance and twist the collet round slightly.

However with an error this small it will be hard to work out which way to adjust by observation, you will just have to try it. Alternatively you could leave well alone at this stage. I would normally consider anything less than 1ms to be a good result.

 

  • Like 1
Link to comment
Share on other sites

 
I pretty much agree and I was going to leave it, but I was wondering about the variation in BE as I mentioned from 0.4 PU to 1.4 PD.

Now look at the rate in different positions. If no more than about 20 secs a day and you can regulate to average for the most used positions like crown down, 12 down and dial up, you have achieved a great result already.
Link to comment
Share on other sites

Regarding your graph, I cite Donald De Carle in "Practical Watch Adjusting" page 131:

one pallet stone is not being held by the escape wheel when in position of rest - there is a lack of "Draw"

 

Good luck setting that stone correctly! ;)

 

Link to comment
Share on other sites



  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • This is not rare at all, the dial code and case code don't usually match.
    • Good question!! Anyone know of a substitute movement??!! 🤔🙏
    • Interesting issue that I just noticed: this Seiko 5actus Watch from 1977 has a calibre listing on the dial of 7019-8030R but on the case back it says 7019-8010!! Like a mis-printed coin, is this watch therefore worth a lot of money for its rarity?? 🤪😲🤔🤪
    • I wish that was the case. The Aegler movements used in the early days by Wilsdorf & Davis (for brands like Rolex and Rolco) came in several sizes and without designated calibre numbers that survive.  They become a bit easier to identify during the 1920s. Below is an Aegler-Rebberg, 25.74mm in diameter. It’s from a woman’s Rolex wristwatch. Stamped Rebberg and 500 on the dial plate (but it isn’t a Rebberg 500, it’s the wrong size).  I’d be interested if anyone can identify the movement.  It is based off the Aegler Nr.1, circa 1903, but they based many many calibres of different sizes on it. The closest I have to a positive ID is the  ‘Rolex Nr.50’ circa 1917, but no dial side images or movement sizes are available in the references. There are identical looking movements in many sizes.  The 25.74mm of this movement is a particularly strange size for the era, it equates to 11.41 lignes.      Best Regards, Mark
    • It looks like this movement comes with a number of different shock settings. Emmywatch shows that it comes in versions with no shock settings, 'Incabloc', 'shock resist', and 'Supershock'. Perhaps the different settings position the impulse jewel/roller table in a non-ideal position relative to the pallet fork/guard pin. Are you able to check under high magnification if the pallet fork and roller table are able to operate without any interference? Just for fun I took a look and I have one FHF 70 in my collection, a West End Secundus with a non-shock protected FHF70. I had a note with the watch that said, "Movement is stamped 'FHF 70', but the FHF70 looks to have sub-seconds instead of center seconds movement (??)" but that a google search turned up both types for this movement. EDIT: I just took a look in my parts drawer and I have a few of these movements, both in center seconds and sweep seconds, but they all are non-shock protected.  
×
×
  • Create New...