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Thread: Brazing Tab Type Dropouts

  1. #61
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    Default Re: Brazing Tab Type Dropouts

    4094293_orig.jpg


    Quote Originally Posted by Ahmdo Molah View Post
    Thanks for your pointer Steve.
    OK - so, a little build history will go a long way here - if you look at many (almost all) mass produced road bikes of the brazing era you will see what's often called a "domed stay" where it's rounded at the dropout end and the dropout just snugs in there - how do they shove in 1/2 a rod you wonder?

    They don't.
    They just 'lipstick' the edges around the end of the stay, maybe feed a bit more in at the back of the DO and on you go to the next 1000 you have to do that day and they last just fine!

    Also, no need to cut it apart to see where the bronze is - just look at the dark cherry colored plug as it cools slower than the rest of the stay - this is the extent of your fill - indeed, many builders leave the stay 'lipsticked' around the edges of the slot and the end of the spearpoint is open to drain, no plug.........


    - Garro.
    Last edited by steve garro; 10-11-2022 at 11:49 AM.
    Steve Garro, Coconino Cycles.
    Frames & Bicycles built to measure and Custom wheels
    Hecho en Flagstaff, Arizona desde 2003
    www.coconinocycles.com
    www.coconinocycles.blogspot.com

  2. #62
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    Default Re: Brazing Tab Type Dropouts

    Quote Originally Posted by steve garro View Post
    ... - indeed, many builders leave the stay 'lipsticked' around the edges of the slot and the end of the spearpoint is open to drain, no plug.........
    Would a cross-section view of such "no plug" stay look something like this*?
    (*without the bent rod stand)

    No.15 (Cross Section, No Plug).jpg
    Jihoon Jo

  3. #63
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    Default Re: Brazing Tab Type Dropouts

    Quote Originally Posted by Ahmdo Molah View Post
    Would a cross-section view of such "no plug" stay look something like this*?
    (*without the bent rod stand)

    No.15 (Cross Section, No Plug).jpg
    Yep.
    That is every bit as strong for the same reason tubing is hollow !!

    - Garro.
    Steve Garro, Coconino Cycles.
    Frames & Bicycles built to measure and Custom wheels
    Hecho en Flagstaff, Arizona desde 2003
    www.coconinocycles.com
    www.coconinocycles.blogspot.com

  4. #64
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    Default Re: Brazing Tab Type Dropouts

    Quote Originally Posted by steve garro View Post
    Yep.
    That is every bit as strong for the same reason tubing is hollow !!
    Thanks so much for the confirmation and explanations... it has broadened my understanding and perspective on options.


    Quote Originally Posted by Doug Fattic View Post
    ... It appears you got your joint too hot. ...
    Once I turned OFF the very bright overhead lamp*, and used a much dimmer light** off to one side, I could see the red glow of the metal much sooner with much more range of tones (much of which was masked with the brighter light ON).
    *(2400 lumen 30W LED strip, equivalent to about 2 x 100W incandescent bulbs!) vs
    **(900 lumen 10W LED strip, equivalent to about 1 x 60W incandescent bulb)

    This made it much easier to make a significant reduction in heat input. Enough that the mock-up sample went from looking like a

    Warty Sea Squirt (tasty seafood delicacy btw, LOL)

    Warty Sea Squirt.jpg

    to one that looks more like a braze joint!

    No.16 (Brazed Without Overhead Lamp).jpg

    I now understand why many builders' shops are dim.

    Pulling the flame(away from the work) also helped significantly in keeping a steady glow while working. Thanks again for the tip!
    Jihoon Jo

  5. #65
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    Default Re: Brazing Tab Type Dropouts

    When I lived in Raleigh NC my brazing location was outside on the patio. I got a white "event" tent with sides to cut done the breezes. If the sun was out the tent was so bright that I couldn't see the heat/colors until things were really hot and the flux was burning. Someone suggested watching the flux changes as the heat level indicator and that worked for me. Now my shop is in the basement (and no longer in NC) and the brightness is far less but I still look at the flux as the initial heat indicator. Andy
    Andy Stewart
    10%

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