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drill/tap in frames
On Wed, 11 Jul 2018 20:16:33 -0700, Jeff Liebermann
wrote: On Wed, 11 Jul 2018 13:48:47 -0500, AMuzi wrote: I think the question isn't so much 'has the tube's ultimate strength been diminished?' but rather 'is it yet strong enough for expected application?'. Nope. I'm not trying to measure if the tubing is strong enough. Assuming identical lengths of tubing, I wanted to see if the presence of a Rivnut significantly changed the tension required to bend or break the tubing when compared to the identical tubing that did not have a Rivnut inserted. If I'm able to pull hard enough, I should be able to eventually break both tubes. If they break at the same tension, then I'll declare the Rivnuts are safe to use. If there's a substantial difference in tension, then I'll declare the Rivnuts weaken the frame. I'd think it obvious that any hole drilled laterally into a tube would have an effect on the bending strength of the tube. The question wouldn't be whether the rivnut changed the strength of the tube but whether the tube was strong enough with the rivnut installed in the tube. In theory and in absolute yes the tube is less strong. In practice, from Santana ExoGrid tandems to Bianchi thinwall tempered aluminum models, to their carbon bikes, rivnuts are not a failure point. Where are the Rivnuts installed on these machines? Water bottle holders? The pictures don't show much detail: https://www.google.com/search?q=Santana+ExoGrid+tandem&tbm=isch& https://www.google.com/search?tbm=isch&q=bianchi+aluminum -- Cheers, John B. |
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