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  1. #1
    Junior Member
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    How big a deal is brazing?

    I'm looking at making a replica of the following...:
    http://www.grc.nasa.gov/WWW/k-12/air.../biketest.html
    (just the special wheel apparatus on the bike, not the bike itself)

    ...and was thinking this might be a nice easy introduction to brazing, hopefully using an inexpensive tool like this:
    http://www.homedepot.ca/product/mapp...ylinder/913335

    My vague plan thus far involves using rack and/or fender stays, maybe some metal rod, and creating the support struts, learning basic brazing technique along the way, and finally mounting an axle nut to the top of the u-shape where the wheel will screw in and mount.

    I thought I'd get a reality check from the community given the state of my plan right now. Can I effectively braze something like this using the equipment I linked to? Has anybody tried anything like this before? Any constructive comments would be welcome.

  2. #2
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    I'm not sure what temperatures you will get with that torch. The big box stores usually stock a mapp/oxy torch that will produce plenty of heat for your project if you plan on using 45 or 56 silver. Not sure if it will work with brass. The torch kit only costs a little more than the one you picked but if you want to go any further than this project, the oxygen bottles will end up costing a lot-enough to justify a real torch setup. The oxygen bottles don't last long and you will be surprised how fast they will empty. You say "a nice easy introduction to brazing". If you think there is a good chance you will be doing bigger projects, get a real O/A torch now. The money spent on a cheaper substitute is wasted.

  3. #3
    Randomhead
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    mapp really isn't hot enough to braze with bronze. If you use larger sections, it's not going to be much fun with silver. I've tried to use mapp to silver solder bandsaw blades, and my clamps were enough to keep it from being hot enough to flow silver. Adding this frustration on top of learning to braze makes me question the whole enterprise

    People have made bike frames with mapp, so it is possible.

  4. #4
    Senior Member
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    This is what you need.

    The O2 is a bit on the $$ but still cheaper than a full size unit.

    http://www.canadiantire.ca/AST/brows....jsp?locale=en

    I love mine!

  5. #5
    Randomhead
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    you can get the oxygen outfits in the U.S. Most people say it's too expensive if you are going to build a complete frame, but for a small project it will not break the bank.

  6. #6
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    I built my first frame with mapp/oxy. The oxygen will run out at the worst time. You can get a new bottle on before things cool too much but it is a PITA. My impression is that the flame is plenty hot enough but it's small. That caused me to overheat in small spots. I'm sure another factor was failure to keep the torch moving enough when I tried to focus on moving the silver through the lug. An OA torch has a bigger softer flame and it is much easier to keep from scorching things. Mapp/oxy will work but if you are going to go on to bigger,better projects, spend the money on a small OA torch kit.

  7. #7
    tuz
    tuz is offline
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    I've built racks with a MAPP torch and brass filler, so your project could work. You will probably find all the needed materials at aircraft spruce.
    homebuilt commuter, mixte, road and track (+ Ryffranck road)
    bla bla blog

  8. #8
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    Hmm...maybe I should elaborate a bit. I like the idea of having a brazing kit around for future projects, but I'm not dead-set on learning it deeply at the moment. I'm liking that $75 Worthington kit BHOFM recommended, but have no idea if this is an ok piece of kit or is the brazing equivalent of a cheap department store bike. Its also occured to me to just do what I can with a drill and some fasteners to make this project work, but like I said I wouldn't mind getting a first baby-step into that whole frame-building/brazing etc world. Please feel free to keep on commenting if you're enjoying the discussion. I feel like I'm really learning here.

  9. #9
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    It is a first class piece of equipment. These are used by
    a lot of heat and air people because of their portability
    and the fact they can charge off the cylinders by the job.

    I have used mine for several projects and am 100%
    delighted with the performance.

    If you have a Tractor Supply Co. around close, they
    are about $50.

    What I build.

    Cage and motor mount for an RC air boat.


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