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Thread: 70hr Power Reserve - how?

  1. #1

    70hr Power Reserve - how?

    What breakthrough technology has allowed Rolex, Tudor, ETA and others produce new compact movements with a massive increase in power reserve?

  2. #2
    Rolex - longer mainspring I guess. Omega - 2 barrels.

  3. #3
    Grand Master MartynJC (UK)'s Avatar
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    ​ETA ?

  4. #4
    Master
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    Inter alia, didn't Rolex skeletonize the escapement or some such?

  5. #5
    Some watches have even longer power reserves, though maintaining accuracy throughout the entirety of the unwinding of the mainspring is the real challenge.

    Presumably some metallurgical advances have assisted in this regard?

  6. #6
    Grand Master jwg663's Avatar
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    There are watches by several brands (Panerai, IWC, JLC & Baume et Mercier, for example) which have 8 day movements. It's nothing new & has been around since the days of pocket-watches. They used to call them 'hebdomadal', which is an old word for 'weekly', i.e. you'd wind it once a week.


    Lange has a watch with a 31 day power reserve, so 70 hours/3 days ain't all that!
    ______

    ​Jim.

  7. #7
    Quote Originally Posted by jwg663 View Post
    Lange has a watch with a 31 day power reserve, so 70 hours/3 days ain't all that!
    There's the Vacheron 65 day too now! Really interesting method of achieving it:

    http://watchesbysjx.com/2019/01/vach...perpetual.html
    Last edited by hughtrimble; 27th February 2019 at 16:10.

  8. #8
    Grand Master abraxas's Avatar
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    In the new Longines HydroConquest they reduced the rate of the ETA 2892 from 28.800 to 25.200 which increased the PR from 42 to 65 hours.

    That is one way of going about it.

    Additional barrels, or longer springs only increase the stresses on the pivots and reduce the life expectancy of the movement... especially with 9 days PR.

  9. #9
    Grand Master
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    Rolex claim to have made some subtle design changes to reduce the friction at different places in the movement, thus allowing a weaker (thinner) mainspring to be used. This allows a longer spring to fit the same barrel size, thus increasing the running time.

    Longer springs won’t increase wear on pivots, stronger springs do that.

  10. #10
    Grand Master abraxas's Avatar
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    Quote Originally Posted by walkerwek1958 View Post
    ..
    Longer springs won’t increase wear on pivots, stronger springs do that.
    I agree. You said it better than me.

  11. #11
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    Quote Originally Posted by AndySquirrel View Post
    What breakthrough technology has allowed Rolex, Tudor, ETA and others produce new compact movements with a massive increase in power reserve?
    longer power reserve is not a problem for them ,but how to keep the same accuracy is a problem :)

  12. #12
    Grand Master Griswold's Avatar
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    Quote Originally Posted by xiaogouju View Post
    longer power reserve is not a problem for them ,but how to keep the same accuracy is a problem :)

    Quartz solves both of those issues
    Best Regards - Peter

    I'd hate to be with you when you're on your own.

  13. #13
    Grand Master oldoakknives's Avatar
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    Quote Originally Posted by Griswold View Post
    Quartz solves both of those issues
    Nooooooooo..............


    Only joking, have a few grab and go quartz myself
    Started out with nothing. Still have most of it left.

  14. #14
    Grand Master ryanb741's Avatar
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    GS Autos are now 70h and pass more stringent accuracy tests than COSC. 70h is de rigueur these days.

    I have a PAM 562 with 8 day movement but it's always 1m fast after a week.

  15. #15
    Quote Originally Posted by MartynJC (UK) View Post
    ​ETA ?
    Powermatic 80? I have that in both of my Certinas


    Sent from my iPhone using Tapatalk

  16. #16
    Journeyman DaveA's Avatar
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    My 3235 powered Sea Dweller has gone over the 3 days without being worn and stopping.

    I last set the time and date at the end of November, and is currently running 20 seconds slow nearly 3 months on.

    I feel Rolex have hit the sweet spot with this latest movement - I love it!

  17. #17
    Master JC180's Avatar
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    The 8 day IWC 5000 caliber was also notoriously inaccurate...

  18. #18
    Master igorRIJEKA's Avatar
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    120 hrs power reserve,with good price,few problems that can be solved ;)

  19. #19
    Craftsman
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    Seiko spring drive has a max of 192 hours (8 days) by utilizing 3 barrels.
    Last edited by Wilson_smyth; 27th February 2019 at 22:31.

  20. #20
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    Quote Originally Posted by DaveA View Post
    My 3235 powered Sea Dweller has gone over the 3 days without being worn and stopping.

    I last set the time and date at the end of November, and is currently running 20 seconds slow nearly 3 months on.

    I feel Rolex have hit the sweet spot with this latest movement - I love it!
    Absolutely, Rolex have nailed it now I think. They just need to get it in to more models.

  21. #21
    Witchcraft.


  22. #22
    Craftsman Recht's Avatar
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    Mobil 1 Synthetic watch oil. The use of this has resulted in a reduction of friction yielding longer operation time and extended service intervals.

  23. #23
    Craftsman
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    Quote Originally Posted by MartynJC (UK) View Post
    ​ETA ?
    Quote Originally Posted by xiaogouju View Post
    longer power reserve is not a problem for them ,but how to keep the same accuracy is a problem :)
    Not necessarily. Certain versions of Povermatic 80 movement are rated chronometer.

  24. #24
    Master igorRIJEKA's Avatar
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    Eberhard uses only one barrel for 8 days of power.

  25. #25
    Quote Originally Posted by MartynJC (UK) View Post
    ​ETA ?
    The new Longines Military comes with

    Mechanical self-winding movement
    Calibre L888.2 (ETA A31.L01)
    111/2 lines, 21 jewels, 25'200 vibrations per hour
    Power reserve: 64 hours

  26. #26
    Quote Originally Posted by walkerwek1958 View Post
    Rolex claim to have made some subtle design changes to reduce the friction at different places in the movement, thus allowing a weaker (thinner) mainspring to be used. This allows a longer spring to fit the same barrel size, thus increasing the running time.

    Longer springs won’t increase wear on pivots, stronger springs do that.
    Interesting... thanks

  27. #27
    Journeyman
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    Quote Originally Posted by DaveA View Post
    My 3235 powered Sea Dweller has gone over the 3 days without being worn and stopping.

    I last set the time and date at the end of November, and is currently running 20 seconds slow nearly 3 months on.

    I feel Rolex have hit the sweet spot with this latest movement - I love it!
    you lucky guy , google 3235 movement,a lot users crying for not stables,repairs etc. Rolex need couple of years to improve their 3235


    从我的 iPhone 发送,使用 Tapatalk

  28. #28
    The most accurate watch I’ve had was an Oris 111 with ten day power reserve. A single barrel mainspring, 1.8m long. Almost perfect accuracy right across the range. I wasn’t expecting that.

    Just bought a Rado with the Powermatic 80 in it, will be interesting to see and quite useful to have a longer reserve.

  29. #29
    Journeyman DaveA's Avatar
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    Quote Originally Posted by xiaogouju View Post
    you lucky guy , google 3235 movement,a lot users crying for not stables,repairs etc. Rolex need couple of years to improve their 3235
    I don't usually rise to such a lazy post.
    But I did google 3235 movement, and even added "Rolex" and "issues" for good measure.

    Nothing in the first 2 pages, so lost interest in your revelation.


    I'm sure I could find some bile if I turned enough stones over … as we all know the internet is full of folk with spleens to vent.

  30. #30
    Journeyman DaveA's Avatar
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    Quote Originally Posted by henk View Post
    You talk rubbish!
    The thing is he reads rubbish and then writes the same rubbish … which is how these fairy tales escalate into "loads of stuff about it on the internet".

  31. #31
    Quote Originally Posted by DaveA View Post
    The thing is he reads rubbish and then writes the same rubbish … which is how these fairy tales escalate into "loads of stuff about it on the internet".
    & everyone knows that Rolex only have issues with GMT movements ;)
    It's just a matter of time...

  32. #32
    The two Rolex that I have with a 70hr Power reserve are easily my most accurate mechanical watches. Typically never more than a couple of seconds fast over a few weeks of wear.

  33. #33
    Glashütte Original Caliber 36 automatic with one barrel, perpetual calendar, moonphase and panoramadate have 100 hours power reserve.

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