You can also get the O-Rings vulcanized
fat the O-Ring Store. They will do it for you if you know the size
you want. We ended up going to that after a some uses and a
very few failures. Our pressure were quite a bit higher though (3000'
of water)
I've used them both ways. As for splicing, you can buy
a little jig to make your own in, and they seem to work pretty well when
done correctly. It isn't quite super glue they recommend. It's neoprene
cement, flexible after it kicks so it has the same hardness as the rubber.
Vance
-----Original Message-----
From: Andy Goldstein <Andy.Goldstein@videoray.com>
To: personal_submersibles@psubs.org
Sent: Tue, 24 Feb 2009 1:25 pm
Subject: RE: [PSUBS-MAILIST] Alec's Plate Thru Hull Assembly
Alec, or anyone who wants to answer,
Have you used spliced o-rings a lot? I've seen o-rings fail due to
sand, hairs,
small nicks etc.
I'd be pretty nervous to trust a spliced one. But cant say I've ever
used or
tested a spliced one.
I'd be interested to hear some field data on this.
With respect to the o-ring, I just made my own using an o-ring kit from
MSC. The kit is nothing but an assortment of different diameter o-ring
cords, a razor, and superglue. The o-ring in Snoopy's penetrator
bulkhead has been there for 4 years now without incident. When I replace
it I'll see if I can find an appropriately sized off-the-shelf one, but
I'm afraid I don't have a standard size for it off the top of my head.
Brent, I did spot one minor apparent error on the first of the
renderings. It appears to show a weld between cover and seat that
doesn't belong.
A comment I would add with this on the site... I'd recommend installing
these only on endcaps, not on cylinders. The intersection of the seat
with a cylinder, even a big one like the main hull cylinder, is such
that the weld along that intersection pulls the seat out of a plane and
the plate won't seat evenly. I've installed two of them on the main hull
and had to re-machine the seats in place, which is an extremely nasty
job. I've installed another two in endcaps, and neither of those
distorted.
thanks,
Alec
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Thanks Jon, I wouldn't mind, but you might have to twist Alecs arm
a
bit. ;}
I need to add some clearance between the plate and it's seat in the
model and get with Alec to find out exactly what size of O-ring he used
and the exact gland size. Then I could add all the measurement's to the
drawings. You could start the page with the pictures you've already
seen. Since there are several plate thru hull designs out there,
it
might be good to have them all grouped together some way.
Regards,
Szybowski
> Date: Mon, 23 Feb 2009 22:53:59 -0500
> From: jonw@psubs.org
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Alec's Plate Thru Hull Assembly
>
>
> Nice design by Alec and drawing by Brent. Any objection from either
of
> you with putting this up on the website? I think we should find a
place
> on the website for some of these designs rather than have them get
lost
> in the mailing list.
>
> Jon
>
>
>
> Brent Hartwig wrote:
> >
> >
> > * Hello Subdudes, *
> > * *
> > * Alec was nice enough to send me a couple of his drawings of
the
> > plate thru hulls on his subs. I worked up a 3D assembly model
based
> > off his drawings and pictures. I think they are reasonable close
to
> > what Alec has. I thought Alec's welded in ring was steel when
I made
> > the CAD assembly, but both the plate and ring are 316 SS. *
> > * *
> > * So you guys can get a good idea of how they work, here are
a
couple
> > pictures of the 3D assembly. *
> >
> > http://cid-5085d10eb6afe47c.skydrive.live.com/browse.aspx/Alec%7C4s%20Pl
ate%20Thru%20Hull%20Basic%20Configuration
> >
> > *
> > Regards, *
> > * Szybowski *
> >
> >
> >
>
>
>
>
>
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