covie Posted January 9, 2011 Posted January 9, 2011 time to get something out if u follow my drift Yeah time to check if they pay out no questions asked lol.
TNT1 Posted January 9, 2011 Posted January 9, 2011 Break, It is an Omega frame, manufacturers closed down looonngg ago, so that avenue cannot be explored. Frame is about circa 2005, old in alu terms. Yeah,I think Omega went bust cause all their frames broke. Weren't they bought out by the raleigh folks, cause when my sisters Omega cracked, it was replaced by a raleigh. Also, someone has been talking complete *** to you if you think 5 years is old for a frame, aluminium or any other material. A well made frame will last a lot longer than that.
Santa C Posted January 9, 2011 Posted January 9, 2011 Also known as the powerbalance placebo effect... Lol
The_Break Posted January 9, 2011 Posted January 9, 2011 you got one at vasity speak to anton best in western cape , break should know him Anton I know is damn good at Alu welding and I would assume Fe as well. He is great. Phone The Mech End building at Stellies and ask to be put through to SMD. Then ask for Anton. He should be able to sort you out and at least tell you if a fix is a good idea.
The_Break Posted January 9, 2011 Posted January 9, 2011 Longer seatpost will not help as the clamp sits at the top and when it cracks all the way through the seat will sway. Agreed! +1
The_Break Posted January 9, 2011 Posted January 9, 2011 actually the break, all companies that design make best guestimates, and if you're an engineer, you should know this all too well. FEA, bench tests, and the marin factors all are best guestimates as real life conditions are at best SIMULATED, unless you've managed to figure out what no one else has managed todate That best guestimate phrasing does not imply a simpletons versionf of guess at all, and an engineer will automatically understand the context for it's usage. Also, that 'arc' you referred to. I assume you referring to the first photo. That's in the HAZ, where yes, HAZs typically are stress concentrators. But given that this bike already has a nick name, ie The Red Rocket, Wannabe musta ridden this thing like his favorite gf, so yes, it's more than likely he has found this particular components fatigue failure limit. If this were a brand new frame, then by all means: flame to your hearts content. I simply believe that that is not warranted in this instance. Where is JB when u need him out of curiosity, what work do you do ? And that is why there is such a thing as a safety factor as well as endurance, fatigue and strength testing. Bottom line is, something that is properly designed and properly made will not break within its expected lifetime and for bicycle the expected lifetime is not 5 years. Either way, this failure is due to poor design and/or manufacture. Period. To answer you question - I am a consulting mechanical engineer in design and development. Mostly for the Auto Industry.
Berry Posted January 9, 2011 Posted January 9, 2011 And that is why there is such a thing as a safety factor as well as endurance, fatigue and strength testing. Bottom line is, something that is properly designed and properly made will not break within its expected lifetime and for bicycle the expected lifetime is not 5 years. Either way, this failure is due to poor design and/or manufacture. Period. To answer you question - I am a consulting mechanical engineer in design and development. Mostly for the Auto Industry. i told him i will not weld if it was mine will replace it
The_Break Posted January 9, 2011 Posted January 9, 2011 i told him i will not weld if it was mine will replace it Personally I would also not weld it, but it sounds from a few comments that there may be more sentimental value and getting her back on the road may be worth it. All depends on just how bad the bike is needed or wanted back on the road.
chris_w_65 Posted January 9, 2011 Posted January 9, 2011 Don't worry guys, no plans to use/repair the frame. Praying and trusting in GOD that this matter will speedily be resolved to my satisfaction. (read frame being replaced by insurers.) Surely insurance does not pay out for wear-and-tear/manufacturing-faults?
chris_w_65 Posted January 9, 2011 Posted January 9, 2011 (edited) Anton I know is damn good at Alu welding and I would assume Fe as well. He is great. Phone The Mech End building at Stellies and ask to be put through to SMD. Then ask for Anton. He should be able to sort you out and at least tell you if a fix is a good idea. Isn't the whole frame heat treated in the factory after all the welding is done? Edited January 9, 2011 by chris_w_65
bikemonster Posted January 9, 2011 Posted January 9, 2011 Left field suggestion: 1. Buy the longest seat pin you can find.2. Adjust to fit. VERY carefully.3. Drill and rivet seat pin to seat tube. This looks like another of my flippant suggestions, but I can't see why it shouldn't work, although it may not help the (already stuffed) resale value of your bike.
The_Break Posted January 9, 2011 Posted January 9, 2011 Isn't the whole frame heat treated in the factory after all the welding is done? Some makes, but if you are referring to doing away with stress concentrations it will only help to reduce internal stress. The stress concentratioon in question is due to the sharp transition between weld and tube and the non-uniformity inthe area. A good welder will create a nice smooth weld that has a nice transition from tube to weld to tube. Having a "bump" causes the stress concentration. No amount of heat treatment wil help such.
Capricorn Posted January 9, 2011 Posted January 9, 2011 (edited) To answer you question - I am a consulting mechanical engineer in design and development. Mostly for the Auto Industry. and how long you been a mech eng? Edited January 9, 2011 by Capricorn
Reg Lizard Posted January 10, 2011 Posted January 10, 2011 Wannabe: you'll soon find out how good Outsurance is
covie Posted January 10, 2011 Posted January 10, 2011 Wannabe: you'll soon find out how good Outsurance is Hey "With outsurance you always get something OUT".......... Just not as much as you hoped for lol
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