Duration Test

Thread: Duration Test

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  1. #1
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    Duration Test

    I recently finished up a Princton with a 21j twin barrel Slava 2414 movement and wanted to see how long it would go.
    I did 2 sets of full wind time tests and here is what I came up with.
    Tests were done flat on back with no moving.
    Test 1 took 56 winds and produced 53 hours and 32 minutes with +6 seconds accuracy.
    Test 2 took 54 winds and produced 54 hours and 5 minutes with +5 seconds accuracy.
    The winds are what I would call average and may not be full 360 degree turns.
    I am in process of one final test that will give me a good overall average and it took 56 winds. I am happy with the accuracy and duration.
    Attached Images Attached Images

    1979 5513 Submariner
    1977 Timex Milspec Custom Conversion
    1966 Timex 600 Skindiver
    1969 Benrus US Military Issued
    1961 Belforte Sheppard AFB
    1961 Omega Seamaster



    "Time spent waiting between the seconds is only conspiring to make me older" DV 2018
    "I don't always agree with everybody but when I do it's because I'm Right"
    DV 2011
    Dirtvictim The Watch Mechanic.

  2. #2
    Mod. Russian, China Mech. Chascomm's Avatar
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    Re: Duration Test

    Quote Originally Posted by dirtvictim View Post
    I recently finished up a Princton with a 21j twin barrel Slava 2414 movement and wanted to see how long it would go.
    I did 2 sets of full wind time tests and here is what I came up with.
    Tests were done flat on back with no moving.
    Test 1 took 56 winds and produced 53 hours and 32 minutes with +6 seconds accuracy.
    Test 2 took 54 winds and produced 54 hours and 5 minutes with +5 seconds accuracy.
    The winds are what I would call average and may not be full 360 degree turns.
    I am in process of one final test that will give me a good overall average and it took 56 winds. I am happy with the accuracy and duration.
    That's an impressive reserve for a watch usually rated at 36 to 40 hours for the auto versions. Add a few hours for a non-slipping spring in a hand-winder and it still falls well short of yours. Lum-Tec were claiming 80 hours prior to release, and then amended it at a late stage to 40 hours I think. My guess is that they fitted longer mainsprings to a prototype but found it didn't run so well.

    My longest power-reserve watches are a 1970 Nanjing SN-2 Zhongshan and a 1982 ZuanShi SM1AK, both a bit under 55 hours. The Zhongshan is nowhere near as accurate as yours.

    How does the Slava perform on the wrist? Or is that the next test after this one?
    Chascomm
    Moderator, Russian Watches & Chinese Mechanical Watches Forums
    (no, I am not going to list all my watches here)

  3. #3
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    Re: Duration Test

    Quote Originally Posted by Chascomm View Post
    That's an impressive reserve for a watch usually rated at 36 to 40 hours for the auto versions. Add a few hours for a non-slipping spring in a hand-winder and it still falls well short of yours. Lum-Tec were claiming 80 hours prior to release, and then amended it at a late stage to 40 hours I think. My guess is that they fitted longer mainsprings to a prototype but found it didn't run so well.

    My longest power-reserve watches are a 1970 Nanjing SN-2 Zhongshan and a 1982 ZuanShi SM1AK, both a bit under 55 hours. The Zhongshan is nowhere near as accurate as yours.

    How does the Slava perform on the wrist? Or is that the next test after this one?
    In my experience generally speaking one wind = approx. one hour on almost everything I have and have worked on, that prompted my testing. When it took 54 winds it intrigued me.
    Yes I read on ranfft that power reserve was 42 hours and thought that should be a conservative estimate given the twin barrels, after all why do two barrels and only get little more than most every single barrel out there? I do understand that more gears = resistance.
    This is why I am doing three sets of tests so I am sure I get it right.
    I figure on doing one each face down, crown up, down tests then see some wrist testing to get overall accuracy numbers.
    1979 5513 Submariner
    1977 Timex Milspec Custom Conversion
    1966 Timex 600 Skindiver
    1969 Benrus US Military Issued
    1961 Belforte Sheppard AFB
    1961 Omega Seamaster



    "Time spent waiting between the seconds is only conspiring to make me older" DV 2018
    "I don't always agree with everybody but when I do it's because I'm Right"
    DV 2011
    Dirtvictim The Watch Mechanic.

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  5. #4
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    Re: Duration Test

    Final testing at 56 winds produced 53 hours 34 minutes and +7 sec.
    Face down 24 hour test made +3 sec. Crown up 24 hour made +4 sec and crown down made +4 sec.
    Not the most accurate but pretty cool as far as twin barrels go.
    1979 5513 Submariner
    1977 Timex Milspec Custom Conversion
    1966 Timex 600 Skindiver
    1969 Benrus US Military Issued
    1961 Belforte Sheppard AFB
    1961 Omega Seamaster



    "Time spent waiting between the seconds is only conspiring to make me older" DV 2018
    "I don't always agree with everybody but when I do it's because I'm Right"
    DV 2011
    Dirtvictim The Watch Mechanic.

  6. #5
    Member rmelle's Avatar
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    Re: Duration Test

    Dear,

    well that is within COSC norm!
    nice movement, I didn't know that Slava made twin barrel ebauches.
    But as for duration:
    Twin barrels are not likely to improve the duration, unless it is a longwind barrel (very long mainspring)
    And as there is no 8-day wheel, your watch is running quite long!!!
    Gives a clue to your servicing qualities!!!!!
    In general a barrel can only make about 8 turns.
    With the the filling capacity of 50% surface of barrel.
    This is the best for all barrels, OK unless it is a longwindbarrel!!
    Twin barrels are more for a consistant power supply to the escapement.
    nice Ebauche any way! In what case is it?

    regards,
    RJ van Melle.

  7. #6
    Member Marrick's Avatar
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    Re: Duration Test

    Quote Originally Posted by rmelle View Post
    Dear,
    I didn't know that Slava made twin barrel ebauches.
    Quite a few are to be found in Sekonda watches:

    https://forums.watchuseek.com/showthr...highlight=2414
    Everybody is ignorant, only on different subjects."

    Will Rogers (1879 - 1935)


    Please don't PM me to ask for a valuation - I won't attempt one.

  8. #7
    Member rmelle's Avatar
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    Re: Duration Test

    Dear,
    Thanks!
    I never saw them here in NL!
    HHmmm would like to have one... (not for the case, for the technique!!!)
    stupid work and hobby
    Where does it end, never I suppose.
    Reminds me of my teacher when I was an apprentice:
    At the age of 63 he did still see things which he never ever had seen before...

    regards,
    RJ van Melle.

  9. #8
    Member Marrick's Avatar
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    Re: Duration Test

    Quote Originally Posted by rmelle View Post
    Dear,
    I never saw them here in NL!
    HHmmm would like to have one... (not for the case, for the technique!!!)
    stupid work and hobby
    RJ van Melle.
    If you want I can send you one (free). It has no stem or crown, and a few teeth missing on one of the winding wheels. Otherwise OK. PM me your address.
    Everybody is ignorant, only on different subjects."

    Will Rogers (1879 - 1935)


    Please don't PM me to ask for a valuation - I won't attempt one.

  10. #9
    Member rmelle's Avatar
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    Re: Duration Test

    Dear Marrick,
    I recieved the watch!
    What a very nice timepiece this is.
    and a very fine square case, nice dial... going for restauration defenately!
    What I noticed immediately:
    WHAT A HUGE BALANCE DOES IT HAVE!
    and indeed the windingwheel is hhhmmm BAD hahaha..
    I wonder how it happened.
    Keep you informed about progress.
    first searching parts hahaha.
    Thank you very much! :thanks

    Regards,
    RJ van Melle.

  11. #10
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    Re: Duration Test

    Hi there,

    don't rely too much on power reserves mentioned in my archive, if the
    photos don't mention my copyright.

    I get photos from other collectors now and then to fill gaps in the
    archive. Then I can't check the power reserve by myself, and I'm forced
    to take data from the literature.

    For the automatic Slava 2416 I mention 40h, and actually this means that
    I never had a sample runnung less than 41 hours. Manual wind equivalents
    usually have 10 to 30% more power reserve, given by the lost space
    needed for the slip spring, and by the reason that the slip spring starts
    slipping before the last turn is wound.

    After this experience, one should expect something between 44 and 52h
    for the 2414, and not the presently recorded 42h, taken from literature.
    And if one dirtvictim's sample runs minimum 53:32h, I guess it is a good
    idea to update may archive to 52h until I can make own measurments.

    Regards, Roland Ranfft

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