(12-14-2012, 12:30 AM)painkiller Wrote: Thanks Rob, for now it is being recycled in the fluid trainer for the winter. Still a chance a bus may bust through wall and get me I still have to try it out for the sake of trying. I am certainly not desperate for another bicycle really. If it has to stay in the trainer when I am done thats fine too. scrap it out for a $1.50, nope! It is better to fail and learn than to never have failed at all (builds character). I cannot go back to my engineers and tell them they are wrong,have you ever tried telling one they are smoked up?
I will utilize a pull tester that will determine exactly how much force per square inch it will take to breach the bond before I will proceed with the bonding of the headtube. I believe it will be in the 1500 lb. range or the aluminum will snap or tear before the bond breaches. It will not fail catastrophically if I can achieve that failure rate in a pull test of one square inch of bond. I will not assume anything until the test results and data taken has been analyzed for this specific application and analyzed again. that will determine how far I am willing to go on or not. We shall see but at least I will know with facts and data the possibility of saving and using a SaFE! frame that other wise has met its demise.
Holy cow, man. Are you and Nigel (nfmisso) related? Why do I get the feeling I'm about to step in poop, here?
Engineering is a very cool and needed field of expertise but it is often reprimanded by Real World Results. Remember the Edsel? Just ugly. Okay - that was the Design / Marketing Group but, ain't many still on the road.
The 'test' that you intend to run on that headtube is not unfamiliar to me. You may as well put it through a Rockwell hardness test while you're screwing around. None of that "science" will amount to a hill of beans if the frame is subjected to a SUDDEN, sharp, off-camber landing by an aggressive MTB'r trying to save skin. That's probably what caused the fracture to begin with. We all know that a repair is seldom stronger than the original build.
Ride it on the Trainer and enjoy the scenery. Don't forget the heavy-duty zip-tie.
That frame, Bob, is NOT dirt worthy and I would hate to see it get into unsuspecting hands. It is your duty, as a promoter of the cycling lifestyle, to ensure that only reliable equipment escapes your shop, brother. $1.50? Say what??
Now that I have chastized you and embarrased us both in front of our peers - I think that the quote that you were searching for was...
"Try not. Do. Or do not." Jedi Master Yoda.
Merry Crashmas.
Rob
Wheelies don't pop themselves. (from a QBP fortune cookie)