[PSUBS-MAILIST] Threaded Inserts

[Michael Dell via Personal_Submersibles]

Are these the circular type as in the outside shape? If so I would square
off the flange end to prevent them becoming loose in the epoxy bedding
resin, I have had a few do this due to over tightening of the bolts and if
they need to be replaced they are not easy to remove... I haven't had much
to do with the type you mention with thread on the outside but would think
it could only help prevent such problems.

Also you would get a much better adhesion to the alloy if you used a
methacrylate type adhesive such as Plexus, the alloy is etched using a
primer (a plexus product) to ensure maximum adhesion, a little more
expensive than epoxy but worth it for the peace of mind...

Mike

On Fri, 28 Dec 2018, 8:22 p.m. Alan James via Personal_Submersibles <
personal_submersibles at psubs.org wrote:

> Hi,
> is anyone using threaded inserts in fiberglass to attach components.
> I was looking at attaching my ballast valves & lights as per attached
> drawing
> with the flanged end of threaded inserts fitted in to holes drilled in my
> ballast
> tank, & then filled in with epoxy around them.
> Most of the images I have see in searches show the flange at the top, but
> I thought it would
> be stronger with the flange embedded. There are other versions of the
> threaded
> insert that have an additional large thread on the outside.
> I thought it would be easy to locate the inserts in relation to the holes
> in the top ballast
> plate by screwing them up to the plate with the retaining bolts & pushing
> them down
> in to slightly oversized holes in the fiberglass that are half filled with
> epoxy.
> when the epoxy sets just unscrew the bolts & fill in the rest of the way
> round the
> inserts.
> Alan
>
>
>
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