patching Aluminum frame hole with glue and material?
04-01-14, 06:59 AM
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patching Aluminum frame hole with glue and material?
recently i purchased an early 90's cannondale mtb for a song.. (5 bucks) when i got it home i noticed there was a penny sized hole on the bottom of the bb shell from bottoming out i guess 
. can i patch this with some glue and a piece of a beer can? or should this not be recomended?? really hope to save this frame.. pics when im done with my next beer...
. can i patch this with some glue and a piece of a beer can? or should this not be recomended?? really hope to save this frame.. pics when im done with my next beer...
04-01-14, 07:14 AM
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use it as a drain hole.
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04-01-14, 10:24 AM
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Yeah, too bad it's not a quarter sized hole instead. You're talking real money, there. 
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● 1971 Grandis SL ● 1972 Lambert Grand Prix frankenbike ● 1972 Raleigh Super Course fixie ● 1973 Nishiki Semi-Pro ● 1979 Motobecane Grand Jubile ●1980 Apollo "Legnano" ● 1984 Peugeot Vagabond ● 1985 Shogun Prairie Breaker ● 1986 Merckx Super Corsa ● 1987 Schwinn Tempo ● 1988 Schwinn Voyageur ● 1989 Bottechia Team ADR replica ● 1990 Cannondale ST600 ● 1993 Technium RT600 ● 1996 Kona Lava Dome ●
04-01-14, 10:51 AM
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maybe i can stick a dowel through it and make bike art ?
04-01-14, 10:56 AM
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Carefully drill the hole out with a bit and a lot of coolant, to make a true round hole. Tap the hole, and thread in a short bolt with a rubber washer. Then install one of those multi-speed gearboxes into the bottom bracket, and use the bolt you just installed to periodically drain the oil.
04-01-14, 11:50 AM
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...all is lost. If you ride the bike that way you shall surely die. Is this thread about bikes or about trolling ?
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04-01-14, 05:04 PM
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Penny sized?? Wouldn't a Champagne cork be close to the exact size to plug it? JB Weld wouldn't be a bad idea either, if you want to get rid of the opening all together. Just suild it up, sand it down smooth to the level of the BB shell and re-paint the area... Doesn't have to be perfect, as nobody will see it most of the time...
I suspect that the hole could have been drilled out there to be able to knock out a stuck seatpost with a rod from the bottom of the seat tube at one time..... Lots of builders and manufacturers had drilled big or many holes on the bottoms of BB shells without any consquence, as long as it's not too big/overdone, so I don't think there's really a problem. I like the suggestion of "easing" (smoothing/rounding) the edges of the hole so no stress risers might be present to propagate crack development from it later.
I suspect that the hole could have been drilled out there to be able to knock out a stuck seatpost with a rod from the bottom of the seat tube at one time..... Lots of builders and manufacturers had drilled big or many holes on the bottoms of BB shells without any consquence, as long as it's not too big/overdone, so I don't think there's really a problem. I like the suggestion of "easing" (smoothing/rounding) the edges of the hole so no stress risers might be present to propagate crack development from it later.
04-01-14, 05:28 PM
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Have a welder TIG an aluminum plug into the hole, in case of fears of cracks.
Have a BB installed into the shell to stabilize it from warping from weld heat.
Sand/file smooth, and touch up the area with paint. Done.
Have a BB installed into the shell to stabilize it from warping from weld heat.
Sand/file smooth, and touch up the area with paint. Done.
04-01-14, 08:29 PM
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The TIG (or Heliarc) suggestion is the right one. But if you're just looking to salvage a beater then sand the paint from around the edges of the hole, clean real well with Mineral Spirits then lacquer thinner, and JB Weld a nickel over the hole. Tell people it's a Jefferson skid plate.
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