Como siempre todo está en los libros...
Aquí un artículo interesante
Sobre todo esto:
3) My final question is a bit more serious: After using the chrnograph feature, I noticed that sometimes the second hand seems to exhibit jerky motion. It's doesn't happen every time and I have to pay a close attention to it, but it seems more prevalent when the chronograph function hasn't been used for a while. For instance, when I checked the watch this morning, the second hand got stuck around 5 minute mark for two seconds and then jumped ahead two seconds. It appears that the internal movement is running fine but the actual hand gets stuck until somehow it's released again. Once the second hand goes around the minute mark, it seems like the problem doesn't appear again. Is this a normal syndrome for the new watch?
- No, (explanation follows)
Does it go away after the gears break in?
- No, (explanation follows)
Or should I notify the dealer or Omega?
- No, your dealer would probably not understand what you are talking about (jewellers are not watchmakers)
I would really appreciate if someone familiar with the movement can comment on this.
- I'll try. The sub seconds hand is driven directly from the seconds wheel. Via an intermediate wheel and a clutching system, the chronograph is driven by the same part of the gear train. Then there is a second intermediate wheel that drives the minutes chrono hand, while the hour hand is driven directly by the mainspring barrel. (And held back by a friction spring that sometimes gets so loose that the hour chronograph subdial starts "creeping").
When you engage the chronograph, six wheels are interlocking and engaging in each other. When you disengage the chronograph, the same wheels will disengage and release tension.
The air between the teeth of these wheels has to be absorbed somewhere. Pretend you have six loose cog-wheels in a row. When you engage them, there will be a substantial amount of free play that has to be absorbed from the moment when the first one starts moving till the last one is set in motion.
When you disengage the chronograph, the centre seconds chrono wheel will be stopped by a brake lever, and the horizontal clutch disengages. Sometimes the tension in the interlocking of the chrono wheels will be pointing in the oposite direction of the turning of the seconds wheel. That can cause it to pause for the total amount of free play in the gear train before the tension from the mainsporing barrel reaches the anchour wheel.
Why all this lengthy b**[word removed]? Just to tell you that your watch is in perfect order and that a little jerking is quite normal (you should have seen some movements with indirect driven centre seconds hands, the pause for two to three seconds all the time).
O sea no problema.
Por cierto, sobre el asunto de los aceites lee por favor esto:
They are parrotting the general misunderstanding that watch oils "circulate throughout the movement". Watch lubricant oils are specifically designed to stay where they are put, and they are used in very small quantities and only applied to specific areas. It is the creeping away, or movement, of lubricants over time from the areas subject to friction that necessitates routine servicing.