Benrus Jump Hour Project

Thread: Benrus Jump Hour Project

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  1. #1
    Member trim's Avatar
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    Benrus Jump Hour Project

    This weekends effort.



    Train assembled. This caused me a lot of grief, as I needed to replace the seconds pinion - except when I used the new one, the train was very stiff.



    It took me a while to discover that for some reason, the jewel was set much more tightly in the movement, than in the donor - even though they were the same movement number. Project train bridge:



    Donor - had to press the jewel in further on the project bridge (donor was scuffed up). I think I had the train apart and together 5 or 6 times before I worked it out - it was so unexpected.



    Benrus really finished these very nicely.



    Anchor in.



    Running, yet to get the top balance jewels.



    Movement done. Benrus did a very nice job of finishing these - much better than many. It is a real pity that Benrus is an under-appreciated brand as workmanship like this shouldn't go to unheeded.



    Now for the jump hour mechanism. Parts from the setting, motion works and jump hour mechanisms.



    Setting assembled, plus one of the jump springs.



    Copper eccentric cam to advance the hour number.



    You can see the star on the back of the hour disc, which the bottom jump spring locates in to centre the number on the window. I had to adjust this star about 20 degress to get things lined up properly. Basically, the points should not be on the diagonal of the holes, rather the V needs to be on a diagonal line through the holes.



    Hour and minute discs.



    Finished - with new strap.





    On the wrist. A new crystal is on the way from the US, I will fit it when it turns up. This one is not in great condition with a number of defects - including the crack in the (on a normal watch) 27 minute position.



    Caio.
    Last edited by trim; November 7th, 2010 at 08:15.

  2. #2
    Member Eeeb's Avatar
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    Re: Benrus Jump Hour Project

    The result is quite beautiful! Good work. Thanks again for posting.
    "Forever is composed of nows." - Emily Dickinson

    "The watch has to be surrounded by a history.
    You need more than just a great design. You need to create an atmosphere around the product.
    Who is the company behind it? Why are they using this material?
    People need to be able to identify the watch with themselves. It's based on emotion." - Ralph Furter

    ...that's just my opinion and I've been wrong before and will be again and might be now!

  3. #3
    Member Marrick's Avatar
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    Re: Benrus Jump Hour Project

    Fantastic. That's probably the nicest jump hour I've seen - and thanks for showing us the mechanism.

    Well done with the project.
    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.

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  5. #4
    Member radger's Avatar
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    Re: Benrus Jump Hour Project

    Great post and pictures Trim.
    The watch looks good, as does that movement, nicely finished indeed.

  6. #5
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    Re: Benrus Jump Hour Project

    Wow, what else could be said of this nice piece of work
    Thanks again for sharing!

  7. #6
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    Re: Benrus Jump Hour Project

    Thanks guys. Seems, I posted too soon, as its all got to come apart again. I think there may still be a train problem

  8. #7
    Member trim's Avatar
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    Re: Benrus Jump Hour Project

    I believe I found the problem.

    The cap jewel I thought I lost to the floor was actually inside the movement applying its oil to places it ought not. I have no idea how it managed to get in there! New crystal is here, I will fit it soon and have another photo shoot.

  9. #8
    Member AbslomRob's Avatar
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    Re: Benrus Jump Hour Project

    Dontcha love how parts manage to turn up in the oddest places, usually long after you've given up searching for them?
    My growing collection of "affordable" vintages: http://www.abslomrob.com

  10. #9
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    Re: Benrus Jump Hour Project

    Quote Originally Posted by AbslomRob View Post
    Dontcha love how parts manage to turn up in the oddest places, usually long after you've given up searching for them?
    Its always surprising. I would have sworn in court that the cap jewel went in the other direction. Ah well, it is an especially interesting hobby for many reasons

  11. #10
    Member trim's Avatar
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    Finished: Benrus Jump Hour

    Before (2 watches):

    The first one I bought. Was so much worse than expected. Worn lugs, trashed dial and scratched up case-back. Running and stopping.



    Second one, broken seconds pinion and missing the (hard to get hold of) star seconds, no crystal, and not running.



    After (1 watch and some spare parts)

    Serviced and repair as in original post. After a false start with a wayward cap jewel, now fitted with replacement crystal and finished





    Unmarked back



    Original crown



    Thought I'd try the stick trick. Pity you can see the stick



    How its looked all day - I'm glad to finally have a good one.

    Last edited by trim; November 29th, 2010 at 07:21.

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