Bolt strength

[Clyde Hollinger]

Bob,

I don't know the answers to all of your questions, but I have repaired two or
three separated Everett backs, using 5/16" carriage bolts and epoxy.  No further
problems.  You understand, I presume, that the back is pulled together with
clamps first, not just with the bolt.  I think that wouldn't work.

Regards, Clyde

BobDavis88@AOL.COM wrote:

> 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