Patek Philippe - excellent question

excellent question

the chrono second hand can run continuously and DOUBLE as a second hand because of the lack of friciton in the 28-520 and evenly distributed energy to the chrono modual and time keeping, BUT does not replace or act as the real second hand. Internally, the seconds, minutes and hours are moving forward regardless of whether the chrono is running or not.

The chrono second hand would never be able to measure time because the purpose of the chrono is to stop and start so in any chrono, the seconds that count the hours and minutes are seperate, regardless of whether they are displayed on the dial.

I'm not a watch maker nor have I put together or taken apart the movement of a 28-520 but this is just my opinion/assumption. I hope it helps you chintu.

Bests,

Rob

A technical question on Caliber 28-520 and 5980/5960

By: chintu : November 26th, 2011-08:25

The following technical question would merit an interesting discussion. Caliber 28-520 used in Patek 5980 and 5960 has a central seconds hand that is used as a timekeeping seconds hand that can be kept permanently running ( even when the chronograph funct...

excellent question

By: SpanishRob : November 27th, 2011-14:41

Thanks. It endorses my view on accuracy then...

By: chintu : November 27th, 2011-19:08

Thanks very much. Therefore it appears that it would always be in inadvisable approach for any watch to try and use the chrono-seconds hand to double-up as a time-keeping seconds hand also. Each time the chrono seconds resumes its work as a time keeping s...

A precision

By: Dje : November 29th, 2011-02:31

Hi, Indeed the 5980 (and 5960) doesn't have a permanent seconds hand. Time is indicated only by hour and minute hands. Due to the construction of the calibre you can let the chrono engaged permanently if you want, meaning also that you can use the central...

Patek thus ignores the importance of the central seconds hand in time-keeping.

By: chintu : November 29th, 2011-20:20

I did not say that the watch will become inaccurate. I agree that even when the chrono functions are engaged , the time-keeping minutes hand will continue to keep its accurate time, however the seconds hand when reset from chrono-seconds to timekeeping-se...

And more questions

By: chintu : November 30th, 2011-08:46

If the chrono-seconds hand is left running as a permanent timekeeping-seconds hand, then it would also lead to the chrono-minute hand and the chrono-hour hand ( in the sub dial at 6' O clock) running continuously. This leads to the following questions 1. ...

Dreams are mostly blur ... same with this dream watch ...

By: COUNT DE MONET : November 30th, 2011-12:29

It should have 8 scalings per second as it beats with 28.800 A/h, and not 5. This is with possibly all (?) Patek chronos. It looks like a dream chrono, but if you approach your dream closer and pay attention to details, with a clear mind: it showes faults...