[PSUBS-MAILIST] Threaded Inserts

[Michael Dell via Personal_Submersibles]

We used them in composite race car wheel rims, the type that has a bolt on
bead and it was in that application we discovered the tendency for them to
give way and spin, until we squared them off... Have also used them on
water tank inspection ports in the marine industry.

Mike.

On Sat, 29 Dec 2018, 4:27 p.m. Alan via Personal_Submersibles <
personal_submersibles at psubs.org wrote:

> Thanks Mike,
> yes I was looking at the round type.
> Great suggestion about squaring off the flange, hadn't thought about
> them spinning!
> The type with the large thread on the outside, I have seen in kitset
> furniture.
> I am intending to source a 316 threaded insert with flange & now that
> you've got me thinking, it might pay to grind in to them a bit first to
> help with the adhesion.
> What application have you been using them in Mike?
> Cheers Alan
>
> On 29/12/2018, at 5:00 PM, Michael Dell via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> 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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