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<DIV>Rick, exactly right. They will shear off at the base where the load
is maximized. It's less of an issue with the case hardened bolts since there is
substantial margin for error, but if that was to break, that's where it
would appen.</DIV>
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<DIV>By usingthe partially threaded bolts, the moment arm is reduced and the
load at the base of the thread decreased. If it ever broke, (doubtful) it would
break at the base of the thread, most likely. The core diameter is smaller there
than the shank diameter. </DIV>
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<DIV>Epoxying the shank of the bolt into the hard point works great. </DIV>
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<DIV>I prefer the softer bolts because I can bend these easily with the
technique I have outlined before, to bring the actuation point on the hinge
line.</DIV>
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<DIV>MatK</DIV>
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<DIV>In a message dated 2/15/2005 2:57:25 PM Eastern Standard Time,
knowhow3@bellsouth.net writes:</DIV>
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<DIV>Is the failure point on these bolts always at the base where it
goes into the control surface? Never having had a failure of one, I
don't know, but physics kind of dictates that it would be.</DIV>
<DIV>If so, why wouldn't a socket head or other type bolt that is only
partially threaded work better, since it would remove the stress
risers (threads) at the base area, where the force is concentrated.
Lop off the bolt head and glue it in. The smooth portion of the bolt
could easily be roughed up with a Dremel sanding drum or cutoff
wheel for CA or epoxy to grip it going into the control
surface.</DIV>
<DIV> </DIV>
<DIV>Am I missing something obvious here with this idea?</DIV>
<DIV> </DIV>
<DIV>Rick</DIV></TD></TR></TBODY></TABLE></FONT></BLOCKQUOTE></DIV>
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