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General Chat (Vincent Related)
I hate stainless steel :-)
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<blockquote data-quote="oexing" data-source="post: 142745" data-attributes="member: 1493"><p>Jut to see some numbers for girder forks , the springs will most likely be on block way below one ton (1000 kg) load from the wheel/road forces. The cross section of lower spindles is about 11 mm (7/16 ?) in the thread root . So when taking only 50 kg/mm2 tensile strength minimum for stainless 1.4301 it is 30 mm2 cross section , times 50 makes 1500 kg . Shear loads is 0.7 x 1500 , so it is 1060 kg per side. Both ends will take over 2 tons shear load. With typical road forces you will very unlikely get any fatigue I´d think. </p><p> Sizes of girder spindles were not calculated because of shear loads but for plain bearing load in the greased bushes with spindles. </p><p> Fatigue is a big factor with aluminium at high loads, it never "forgets " earlier high stresses. Some will know alu conrods will be replaced at periods in racing, otherwise you´d risk very bad language and costs when not taking care of replacing in due time. But steel is a lot safer in long use and in mild load use no limits at all. </p><p> The Spares Co sells stainless spindles for years I think and I have not seen reports about any troubles. For getting rid of greasy corners I suggest pairing ss spindles with high tech low wear lubefree plastic bushes like from IGUS, some more brands there from elsewhere I believe. Even concours judges will not have a chance to know about these - apart form finding no grease traces anywhere . . . .</p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 142745, member: 1493"] Jut to see some numbers for girder forks , the springs will most likely be on block way below one ton (1000 kg) load from the wheel/road forces. The cross section of lower spindles is about 11 mm (7/16 ?) in the thread root . So when taking only 50 kg/mm2 tensile strength minimum for stainless 1.4301 it is 30 mm2 cross section , times 50 makes 1500 kg . Shear loads is 0.7 x 1500 , so it is 1060 kg per side. Both ends will take over 2 tons shear load. With typical road forces you will very unlikely get any fatigue I´d think. Sizes of girder spindles were not calculated because of shear loads but for plain bearing load in the greased bushes with spindles. Fatigue is a big factor with aluminium at high loads, it never "forgets " earlier high stresses. Some will know alu conrods will be replaced at periods in racing, otherwise you´d risk very bad language and costs when not taking care of replacing in due time. But steel is a lot safer in long use and in mild load use no limits at all. The Spares Co sells stainless spindles for years I think and I have not seen reports about any troubles. For getting rid of greasy corners I suggest pairing ss spindles with high tech low wear lubefree plastic bushes like from IGUS, some more brands there from elsewhere I believe. Even concours judges will not have a chance to know about these - apart form finding no grease traces anywhere . . . . Vic [/QUOTE]
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I hate stainless steel :-)
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