Exploded Rotor

Thread: Exploded Rotor

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  1. #1
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    Exploded Rotor

    Hi folks,

    I've seen many Felsa Bidynators, and also quite some of their grandmothers Felsa 415, but I never came across a damage like this:



    The facts:
    The watch is some 75 years old,
    the chromed case is near mint,
    the movement is clean and runs perfectly,
    but the rotor seems exploded.

    The lead inlay of the rotor has completely turned to white powder (likely hydroxide) and its grown volume blasted the side wall of the rotor away.

    But whatever affected the lead in the rotor, why is the lead gasket for the back untouched, as visible in the pic?

    No clue about the reason: Chemistry? Miracle? Aliens? Earth radiation? Mobile-phone pollution?

    Regards, Roland Ranfft

  2. #2
    Member pithy's Avatar
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    Re: Exploded Rotor

    Zinkish?

    Lol.

  3. #3
    Member xzqt's Avatar
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    Re: Exploded Rotor

    Ohh ! Exploded Rotor !

    Jokes a side. That looks like some kind of concrete material.

    Last edited by xzqt; March 9th, 2017 at 11:45.
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  4. #4
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    Re: Exploded Rotor

    Definitely caused by the proliferation in contrails...(;
    Autoweight...seal...different alloys...?
    Dissimilar metals...movement...pinion friction...galvanic oxidation...?
    Then of course, you have to consider kharma and incarnations and prior associates...
    Regards, BG
    Last edited by BenchGuy; March 9th, 2017 at 14:30.

  5. #5
    Member gridiron's Avatar
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    Re: Exploded Rotor

    Looks like galvanics but no sign of water, or of an explosion. Is the rotor stainless or brass? Lets wake up the metallurgists out there!

    Grid

  6. #6
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    Re: Exploded Rotor

    I would also guess Zn viskers..... No idea if there is someway a reaction with the bone oil of the older days ( I herared even todays brass alloy would not stand that stuff) ...

  7. #7
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    Re: Exploded Rotor

    Quote Originally Posted by MechaMind View Post
    I would also guess Zn viskers....
    But it would be pretty crazy to melt Zn into the brass rotor, because Zn.is lighter than any brass alloy.

    Regards, Roland Ranfft

  8. #8
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    Re: Exploded Rotor

    75 years old ,1942sh,WW2 , you sure it's lead and not a casting of a bit of everything.

  9. #9
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    Re: Exploded Rotor

    Quote Originally Posted by Molliedooker View Post
    75 years old ,1942sh,WW2 , you sure it's lead and not a casting of a bit of everything.
    Of course I'll not analyse the white powder, but brass is already heavy, and the inlay should be reasonably heavier than brass. And I checked another Bidynator rotor: The inlay is soft, grey on the surface, and silvery after scratching. So I suspect it is no 23K gold.

    Regards, Roland Ranfft

  10. #10
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    Re: Exploded Rotor

    I'd analyze the white powder and the unchanged base material (if you can find any). Might result in better speculation as to what occurred. One would think that at some point the autoweight was exposed to a significantly oxidizing environment...
    Regards, BG

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