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drill/tap in frames
On 12/07/2018 12:50 PM, AMuzi wrote:
On 7/12/2018 11:26 AM, Frank Krygowski wrote: On 7/12/2018 3:01 AM, sms wrote: On 7/11/2018 8:43 PM, Jeff Liebermann wrote: On Wed, 11 Jul 2018 17:24:40 -0400, Frank Krygowski wrote: Exactly. Strong enough is strong enough. OK, so let's pretend that the tube with the Rivnut bent at 10% less tension.ÂÂ* Is that "strong enough"?ÂÂ* There's no way to tell without the original design calculations, or reverse engineering the frame with an FEA model.ÂÂ* Too bad Autodesk killed their online ForceEffect web app. http://blogs.autodesk.com/inventor/2017/01/17/autodesk-forceeffect-family-retirement/ I think I could have modeled the problem using the program. It's a bad experiment because it doesn't take into account whether or not the hole was properly drilled and the Rivnut properly installed. You also have to do it with the same aluminum tubing used on a bicycle frame, but even then it isn't accurate because there's no way to factor in metal fatigue which isn't an issue as much in steel as it is in aluminum. Remember, just because you can often get away with doing a really stupid thing, it doesn't mean that you should still do it. Remember, just because one person declares a practice to be stupid, it doesn't mean the practice really is stupid. In fact, if the practice (like the use of Rivnuts) is generally very successful, the stupidity probably lies elsewhere. Goes both ways.Â* Sometimes, the crowd looks to The Left while visionaries look Right: https://www.zerohedge.com/sites/defa...20nato%204.jpg Or maybe some people only look right, even when it's the wrong direction... |
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