[PSUBS-MAILIST] Threaded Inserts

[Alan via Personal_Submersibles]

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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