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drill/tap in frames
On Wed, 11 Jul 2018 09:42:08 -0700, Jeff Liebermann
wrote: On Tue, 10 Jul 2018 20:41:08 -0700, John B. Slocomb wrote: On Sat, 07 Jul 2018 12:33:38 -0700, Jeff Liebermann wrote: On Sat, 7 Jul 2018 11:06:52 -0400, Frank Krygowski wrote: This group has debated Rivnuts extensively. One poster claims nobody should install a Rivnut unless he has access to a complete machine shop. Others with more experience have said that the installation is easy for anyone with normal mechanical skills. That would be SMS (Steven Scharf) on one of his web pages: http://nordicgroup.us/cageboss/ Since I've made a mess with all the available technologies, Rivnuts (steel and aluminum), brazing (steel), TIG (aluminum), and epoxy glue (plastic boss on aluminum), I'll remain neutral on the matter. Hint: Use steel Rivnuts on steel frames, aluminum Rivnuts on aluminum frame, and plastic straps or clamps on CF (carbon fiber). One can only suppose that those "dumb asses: that manufacture rivnuts deliberately make their product in a number of materials :-) I'm not sure about the deliberate part, but yes, one can buy them in steel or aluminum. I couldn't find any plastic or carbon fiber rivnuts. And, it might be added that not knowing what you are doing is not limited to bicycle maintenence :-) True. If those expounding on bicycle technology by various electronic means really knew what they were doing, they would be riding instead of pounding on the keyboard. If you really want to know how things work, find someone that is actually doing the work and interrogate them for the information you need and don't bother reading books, manufacturers literature, magazines, forums, and newsgroups. The only downside is that those who really know, tend to be inarticulate and have difficulties explaining complex concepts, like which way to tighten a right handed bolt. However, persistence, intimidation, and perhaps bribery will eventually produce the required answer from a real expert. As I mentioned, I have successfully trashed most everything I've tried to do with Rivnuts on bicycles, and therefore have no opinion on the matter. However, it might be interesting to try a simple test. I could probably finance the test by taking bets on the outcome. Take two identical lengths of steel bicycle tubing. Install a Rivnut in only one tube at midpoint. Clamp one end in a pipe vise. Pull on the other end with a Come-Along perpendicular to the tubing. Measure the force with a load cell. Draw a graph to show when the tubing went plastic and eventually buckled. Compare results between the tubing with and without the Rivnut. That should settle the debate whether Rivnuts are detrimental to frame and stay strength. (Big Smile) I know a bike builder who accidentally did just that, with out the rivnut being installed - bending the curve into the front fork blades with a 5 foot bar :-) But as an aside, anything will break given sufficient force applied which doesn't prove much of anything. -- Cheers, John B. |
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