Steve Harris
Member
IF the hoop is made out of steel and the bolster is out of Aluminium and the hoop is bolted to the Ally bearing the steel is stronger BUT a lot less of it than the ally at best it would probably have about the same strength at best. Plus you haven't taken into account that the bolts haven't stripped the threads in the holes !!I'm no materials expert but if the metal that the hoop is fabricated from is stronger than what it is secured to, that might explain the location of the crack in the scenario mentioned.
EDIT
Not sure that I buy the misaligned jack theory. Much more credible (and worrying) is the under specified metal referred to up thread - seems like someone got their sums wrong
And of course the cracking would be because a jack was being lowered (rather than raised), as a jack wouldn't try to peel away the bolster from the body if it was being raised. If it was being lowered and could exert enough force then it might be possible to cause the issue.
If bolts are steel and the bolster is Aluminium I would expect the threads in the holes to strip before the force of them bottoming out starts to crack the welds (of course that is dependent on how much weld there actually is)!Screws for the anvil support bracket too long & bottomed out?
You have to remember Aluminium is normally not as strong as Steel (although there are a few ally grades that come very dam close). Everything depends on how much there physically is (ie width, depth, thickness) of each material and how it is physically fixed (welded, bolted (pitch of thread) etc) to each other.
As all of us are going off pictures which tend not to show scale very well and only show limited detail, so therefore we are just making assumptions which are more than likely wrong.
Until we actually know more I don't see any point in anyone speculating further as it just makes us look even bigger armchair experts than we already are !
Yes I have my own assumption but I'm keeping it to myself as I could be wrong (however, it wouldn't surprise me if the yaw damper crack isn't completely seperate to the jacking bracket crack). But I'm just going to sit back and see what comes out in the wash.
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