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Broke Bianchi

Old 08-10-14, 07:56 PM
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wvridgerider 
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Broke Bianchi

I broke the BB lug of my Bianchi. I really liked the bike but oh weel, a Crosshairs is on order. The grack is at the base of the seat tube and migrating around a chainstay. I was thinking of filet brazing over top of the crack and onto the tubes. Just use the bike for tooling around town, what do you think?
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Old 08-10-14, 10:48 PM
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unterhausen
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I think that would pretty much be a cosmetic repair
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Old 08-11-14, 01:23 AM
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I've repaired courier bikes that way - as long as it's a decent size fillet it's fine, you're turning it from a lugged joint into a filleted joint.
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Old 08-11-14, 07:30 AM
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I guess it's not going to hurt anything, but it is extensively cracked. Seems to me that the chain stay is pretty well gone, and that's cracked down the tube, not at the base where it would be like a fillet.

I would take a critical look at the head tube, I've seen a lot more cracks there than at the BB.
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Old 08-11-14, 09:57 AM
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fietsbob 
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the blasting it clean and adding more brass to the outside and not only getting it flow onto the crack
[some dremeling or needle filing, to clean rust out of the crack
so the flux gets in and brass will stick,

... then filleting to overlay more brass , like BenC suggests .. will get it back in service .

access to a TIG welder (still doing the metal clean up and creating a V to have the filler wire melt into) may also work ..

but OP sounds like they will just replace it
which given mass production costs out of like Maxway TW ... that ... will cost less ..

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Old 08-11-14, 10:32 AM
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What I deal with a lot with couriers is that they have an emotional attachment to a particular frame, so a repair is always preferred to a new frame. I had one which needed a complete new bottom bracket shell (he was riding along and "it just fell off"!) and that was a big job as it also tore off about 1cm from the underside of the chainstay. Replaced the shell, brazed a patch over the chainstay, it's still going strong.
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Old 08-11-14, 03:52 PM
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I will strip the paint and take a good look at everything. I have a welding background and might even do some dye penetrate tests. Like I said I will just tool around on the bike. I was a welder in the Navy, worked in the pipe shop on my old ship, and we silver soldered all of the low pressure pipes. I also welded in high school and the first welding was oxycetylene welding. I always wanted to build a frame since I have been cycling which is 20+ years now. Are any of the frame building schools any good?
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Old 08-11-14, 09:24 PM
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The framebuilding schools I'm familiar with all seem great, but given your background, why not just get a set of tubes and go for it?
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