Bolt strength

BobDavis88@AOL.COM BobDavis88@AOL.COM
Thu, 20 Sep 2001 13:57:05 EDT


Subject: Everett studio, pinblock separating from back 

I need to bolt this sucker back together. I have done this repair twice 
before with half-inch bolts (w/long-term success), and I know others have, 
but I would like to take a fresh look at this from the perspective of the 
engineers out there.
1) I chose bolts empirically, and they worked. However, is there anyone out 
there who knows the tensile strength of various diameters of bolts? Of 
hardened bolts?
2) How much strength do I actually need to resist breaking or bending of the 
bolts?
3) Is there an advantage or disadvantage to hardened bolts in this 
application?
4) Is the separating force the only one I need to worry about, or should I be 
worrying about the shearing force tending to collapse the plate?
5) In re: above, I have always assumed the bolts did all the work, and that 
the glue line was contaminated/dirty enough it wouldn't cinch up completely. 
Is there a glue better than Titebond for resisting creep in a glue line which 
is both dirty and not as thin as it should be? Weldwood? Polyurethane 
(Gorilla) glue? Are both the adhesive and cohesive strengths of epoxy 
sufficient? 
Thanks, engineers,
Bob Davis


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