I recently serviced a Valjoux 7750 and I noticed that the movement runs too fast in the first let’s say two days until it stabilises to a useful rate. With amplitudes between 300° and 264° and beat errors between 0 ms and 0.2 ms depending on the position on the timegrapher I consider the 30 years old movement as “healthy”. I installed a brand new mainspring and wore the watch during this test. I place it dial up during the night.
Furthermore, I think due to my home office status and the lack of movement, it doesn’t wind enough so it is slowing down since 31st March.
See my Excel diagram in the attachment.
Why does it run so fast at the beginning? Is something wrong or is this a normal behaviour? Somewhere I read that watchmakers regulate watches after they ran for 24 h.
I bought a vintage bulova sea king automatic at a antique mall for 80 dollars and I discovered the reason for its lower cost. It appears that it was someone's project watch that they sold. It has a 11 Anacd movement and the rotor is stuck. It can move but it grinds against the metal underneath it. The middle portion of the rotor(with the engraving) is loose and moves independently of the rest of the rotor. I have no clue how to remove the rotor as there are no screws on it. Is this a deeper problem than just the rotor or can I fix/ replace the rotor?
I have a watch movement that I have hunting for a case for a long time now. I bought the movement rather cheaply as I absolutely love the patina on the dial. The movement is an Wittnauer 11arg (as 1361). When the rotor turns the automatic assembly slips (or maybe the mainspring). The pictured gear slips when the rotor turns. I can still wind the movement by hand however the automatic assembly slipping I believe causes the mainspring to unwind. Does anyone know what is wrong/ what I can do to remedy it?
Thanks for your help,
I measured my Omega Caliber 1120 through an timegrapher app. (Dial Up, full wind)
I know the app is not very accurate.
I checked about +100s/d difference and sharply tilted graph .
The odd thing is that the bottom part of the graph is not printed every 100+- seconds.(red-colored circle)
Is this a feature of the timegrapher, or does it indicate abnormal state of movement component?
Thank you for the comments.
No registered users viewing this page.