Jump to content

Erratic Timegrapher Trace for Rate


Recommended Posts

Success!

It turned out to be the hairspring not correctly centred and the coils would touch at high amplitude, causing a rate rise. I adjusted the hairspring to make it more concentric (as much as a coil can be) and retested the watch.

The rate was stable, even when making adjustments, whereas before, an adjustment to the rate or beat would upset the balance and make it unstable. The fault was hidden from my initial reading before strip down because the watch couldn't attain a high enough amplitude, the clue was the high beat error. When I initially lowered the beat error, unknown to me, I was overcompensating for the HS problem and when this was corrected the beat error came back at the same amount, but in the opposite direction.

I've added a final timegrapher trace and a pic of the finished watch. It is stable in amplitude and rate to within a couple of seconds in all positions.

Thank you all for your help and assistance, I have now learned a few more things.

IMG_1682.JPG

IMG_1684.JPG

  • Like 4
Link to comment
Share on other sites

13 hours ago, ClusterFoxtrot said:

It turned out to be the hairspring not correctly centred and the coils would touch at high amplitude, causing a rate rise.

Very good, congrats! I'm also happy to have, for once, got it right on my 1st post here.

  • Thanks 1
Link to comment
Share on other sites




  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • You have a very low chance of straightening this, it should be made of hardened steel, which is very brittle. Maybe you could ask for a refund from the place where you bought it? If you go ahead and try to straighten it and it breaks then nobody will refund you.
    • I had purchased this wheel online but the upper pivot is a little bit bent how can a straight it?
    • I've hit this snag a few times and my solution is to hand wind, don't be tempted to crimp in the spring so that it catches the smaller arbor - nothing but misery lies down that road. A new spring is a reasonable solution if you don't mind the wait - given my location this can be more than 2 weeks and postage is often several times the cost of the part so not very practical. Perhaps another brand of winder may not have this issue, but after the pain of buying the Bergeon generic partial set I couldn't face the cost of a second different set. I did purchase a Chinese set when I was starting out, and lucky enough to get a set with steel arbors (most are brass), but they are caliber specific so unless you happen to be working of that specific caliber they are pretty much useless 99% of the time.
    • You can use a small winder in a big drum, but not the other way round.    The winder sizes are the same for adjacent barrel sizes - 5=6, 7=8 etc. 
    • Strange timing as Kalle just did a video where he expresses his feelings on dial dots, as usual he makes a clear and reasoned assessment 😂  
×
×
  • Create New...