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Thread: Bicycle Frame

  1. #1
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    Bicycle Frame

    How much would it cost to weld a bmx bicycle frame using the tig process?


    I am looking into titanium, or combining two materials but dont know which two metals i should use.

    thanks,
    Mike

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    Re: Bicycle Frame

    To buy the equipment to do yourself or farm it out?

  3. #3
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    Re: Bicycle Frame

    To buy the tubing and do it myself.

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    Re: Bicycle Frame

    So you are set up to do the tig welding and are wondering on price of and wich material too use?

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    Re: Bicycle Frame

    yes i am set up on the tig welding, just wondering what type of material would be the most durable and lightest. i was thinking titanium forks and handlebars and mixing two different metals for the frame but i dont know if that is a good idea, and i dont know where to get the tubing.
    thanks

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    Re: Bicycle Frame

    Check youtube. There are vids on both Ti and Al bicycle frames. I can see Ti being way more costly and ctitical as far as material and welding as far as avoiding contamination when welding over the cost of Al. I have no idea where to source tubing. As far as durability and weight I would have to say Ti. Zap and BC would be 2 of the people here who could shed more expert advice on this. There are tons of others here with expert knowledge these 2 just popped into my head. I wish you the best of luck in your venture .

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    Re: Bicycle Frame

    I need to see some pics of your skills before I even comment. Inside and out of some backpurged welds. Your asking a very steep question there bud. You could be spot on the money as a welder, but I would like to see it first.
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    Re: Bicycle Frame


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    Re: Bicycle Frame

    If you can find the parts it would be a cool project. I tried to teach a guy tig welding with a bike as his project. He learned to weld, but ran into roadblocks with crank mounts and other machined parts. He ended up becoming an engineer, so at least it inspired him. It was in days before the internet, so maybe parts are more available nowadays.

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    Re: Bicycle Frame

    Thanks for all of the replies!
    I'm trying to post a picture of my last tig weld, I stick weld at a shipyard and occasionally tig.
    Last edited by Mataylor900; 11-24-2013 at 08:30 PM.

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    Re: Bicycle Frame

    I would keep it smile and just use 4130 until you've made a couple frames.
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    Re: Bicycle Frame

    Name:  IMG_1888.jpg
Views: 979
Size:  37.6 KB my last tig about two weeks ago. like i said i am usually stick welding.

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    Re: Bicycle Frame

    You may find out there's more to framebuilding than assembling parts- it may be an idea to start with a steel (chrome moly) frame to learn the ropes, then move on to more exotic materials.

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    Re: Bicycle Frame

    Search for user ZANK. Talented guy who welds custom bike frames for a living. Iirc, numerous threads on Ti and SS frames.
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    Re: Bicycle Frame

    I'd go for 4130, lugs and silver solder. It might not be the lightest material, but most likely the simplest and most forgiving method. A welded joint puts alot of stress right at the weld as the frame gets used, a brazed joint with lugs spreads the load over maybe an inch around it thanks to the lug - and the more you spread the load, the less likely failure becomes.

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    Re: Bicycle Frame

    Lug ?
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    Re: Bicycle Frame

    Bubble gum
    Tooth pix
    Duct tape
    Black glue
    GBMF hammer
    Screw gun --bad battery (see above)

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    Re: Bicycle Frame

    Name:  thCAI92TDB.jpg
Views: 916
Size:  5.3 KB Burpee, Lugs are sleeves that go over the tubes then brazed or silver soldered. The beauty of lugs are the angles are built in and no coping cuts.

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    Re: Bicycle Frame

    I have been riding bmx bikes for close to 20 years. Used to race, then moved to street/dirt/ramps/parks. My serious competing days are over, but I still ride often and hard. Take this from a serious bmx rider. CHROMOLY. Unless you are building a race bike, use 4130. There are so many special tubing styles now that it is very possible to make a light frame out of 4130. Companies have made titanium frames, but they WILL break soon if used like a bmx is intended to.

    As others have said, there is a lot more to it than welding. You will need jigs, good high quality tubing notcher, preferably a mill and lathe. Ask S&M (so cal) all the equipment they have. I'm not trying to change your mind, just open up reality a little.

    On the other hand, if this is just for your own use and for fun, then go for it. Ti, alum, duplex, whatever... . its up to you to have fun and make something you want.

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    Re: Bicycle Frame

    There is nothing funnier looking than a grown man riding a BMX bike.
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    Re: Bicycle Frame

    Quote Originally Posted by rschreck View Post
    There is nothing funnier looking than a grown man riding a BMX bike.
    Heck yeah bro! Theres usually a split open head involved, followed by some Oh My Gods, and some laughter!
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    Re: Bicycle Frame

    Quote Originally Posted by weldermike View Post
    Heck yeah bro! Theres usually a split open head involved, followed by some Oh My Gods, and some laughter!
    But that comes after "Hold my beer and watch this"

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    Re: Bicycle Frame

    Quote Originally Posted by Mataylor900 View Post
    How much would it cost to weld a bmx bicycle frame using the tig process?


    Mike
    Henry James is a good place to start.
    http://www.henryjames.com/price10.pdf


    I like the fillet braze as shown in a previous post.
    Going with a fillet braze keeps your heat down, you won't have the issues associated with welding thin material, and you get the bonus of being able to see your braze. You cannot see how good your connection is, brazing with lugs. In other words, you have to know what you are doing

    For a first-timer I'd suggest the fillet braze - with silver(keeps the heat down even more) - Henry James has the best flux.
    Go by a bike shop, and ask for a discarded frame to practice on. If it is brazed, you could even disassemble it, and build one up with a free tube set!
    If it is older and cheaper, it is probably tigged, and heavier walled, but still a good candidate for practicing on,

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    Re: Bicycle Frame

    Quote Originally Posted by Fifelaker View Post
    Name:  thCAI92TDB.jpg
Views: 916
Size:  5.3 KB Burpee, Lugs are sleeves that go over the tubes then brazed or silver soldered. The beauty of lugs are the angles are built in and no coping cuts.
    I apprenticed for a few months at Squarebuilt.com and built a bike, so I'm not just making sh1t up. you do still need to cope the tubes even if using lugs, but the OP wants to build a BMX and I don't think those use any of the angles that lugs come in (usually 73 head angle). I went with a fillet brazed frame and fork because my TIG wasn't up to par for the .6mm wall tubes, actually two years of full time TIG later I'm still not sure. Nice woven weld there Mataylor, but that's enough filler right there for three bikes. If you want to build a road bike, go with lugs and silver or fillet brazed. If you want a bmx order some 4130 from Nova and try one out, it's only 100-200 for the bits to build a frame, (+ $4000 for a nice Anvil jig to make it straight enough to ride nice). I've made a homebuilt tandem out of two MTB's and aligned it with a laser level and a slab of stone countertop material. It rides OK, but the jig-built one is perfect. Check out Paragon Machine Works for the really trick bits.
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  25. #25
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    Re: Bicycle Frame

    Quote Originally Posted by Brazin View Post
    I apprenticed for a few months at Squarebuilt.com and built a bike, so I'm not just making sh1t up. you do still need to cope the tubes even if using lugs, but the OP wants to build a BMX and I don't think those use any of the angles that lugs come in (usually 73 head angle). I went with a fillet brazed frame and fork because my TIG wasn't up to par for the .6mm wall tubes, actually two years of full time TIG later I'm still not sure. Nice woven weld there Mataylor, but that's enough filler right there for three bikes. If you want to build a road bike, go with lugs and silver or fillet brazed. If you want a bmx order some 4130 from Nova and try one out, it's only 100-200 for the bits to build a frame, (+ $4000 for a nice Anvil jig to make it straight enough to ride nice). I've made a homebuilt tandem out of two MTB's and aligned it with a laser level and a slab of stone countertop material. It rides OK, but the jig-built one is perfect. Check out Paragon Machine Works for the really trick bits.
    Thanks for setting me and everyone else straight. I did not think they needed coped. I had a top tube replaced on a road bike once by Karl Hoff in Phoenix Az. but I did not see how he did it.

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