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hole in chain stay
Today there was a guy with a MTB and on the
chain stay there was a small drilled hole, maybe 5mm in diameter. The hole didn't go out on the other side so it was just one entry point. It looked completely undramatic to me but he insisted it reduced strength. Well, of course, but not to a degree where the tube would fail, right? I'd estimate the tube diameter to 2cm plus change. It was an old MTB, 90s or the Millenium, so does that mean most likely steel and possibly aluminium? BTW, are carbon frames like horror story glass-fiber boats in the sense that a crack thru micro-vibrations can make steady but all but undetectable progressions before the whole thing come crashing down? -- underground experts united http://user.it.uu.se/~embe8573 |
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#2
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hole in chain stay
On Tue, 16 Jan 2018 01:52:09 +0100, Emanuel Berg
wrote: Today there was a guy with a MTB and on the chain stay there was a small drilled hole, maybe 5mm in diameter. The hole didn't go out on the other side so it was just one entry point. It looked completely undramatic to me but he insisted it reduced strength. Well, of course, but not to a degree where the tube would fail, right? I'd estimate the tube diameter to 2cm plus change. It was an old MTB, 90s or the Millenium, so does that mean most likely steel and possibly aluminium? BTW, are carbon frames like horror story glass-fiber boats in the sense that a crack thru micro-vibrations can make steady but all but undetectable progressions before the whole thing come crashing down? Metal bikes joined by welding, brazing, lugs, etc., often have vent holes drilled into the tubes near the heating site. The reason for this is that the heat expands the air inside the tube and the vent hole gives it a controlled place to go- instead of, say, sputtering out through the molten brass at the joint. Usually this hole is about 1-2 mm, but some are larger. |
#3
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hole in chain stay
Tim McNamara wrote:
Today there was a guy with a MTB and on the chain stay there was a small drilled hole, maybe 5mm in diameter. The hole didn't go out on the other side so it was just one entry point. It looked completely undramatic to me but he said it reduced strength. Well, of course, but not to a degree where the tube would fail, right? I'd estimate the tube diameter to 2cm plus change. It was an old MTB, 90s or the Millenium, so does that mean most likely steel and possibly aluminium? Metal bikes joined by welding, brazing, lugs, etc., often have vent holes drilled into the tubes near the heating site. The reason for this is that the heat expands the air inside the tube and the vent hole gives it a controlled place to go- instead of, say, sputtering out through the molten brass at the joint. Usually this hole is about 1-2 mm, but some are larger. Thanks a lot, I CC this reply to him right away -- underground experts united http://user.it.uu.se/~embe8573 |
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