[PSUBS-MAILIST] Gamma hatch
Alec Smyth via Personal_Submersibles
personal_submersibles at psubs.org
Mon Dec 1 08:20:44 EST 2014
I'd suggest clamping the ring to something very rigid before welding, and
putting down no more bead than strictly necessary. Perhaps Dan Lance can
chime in?
Thanks,
Alec
On Mon, Dec 1, 2014 at 8:04 AM, hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:
> Brian,
> I have to agree about feeling better with the ring in the middle. At the
> same time, I feel better if the CT is also in the middle and the hatch dome
> is in the middle. This way all the force from the hatch is in a strait
> line down to the hull. When I welded my K350 ring (not ss) it warped just
> under 1/8in. I have to assume the designer allowed for that and started
> with a heavier ring than required. I never use a ss ring, so can't say how
> it will react. I would assume it will warp at least 1/8 inch maybe more.
> Your starting with 1/2 inch material, what will you end up with? Will it
> be enough? I would consider making a steel ring, then bolt the ss ring to
> it. I am assuming the ss ring is simply for corrosion resistance. I would
> run that idea by an engineer of coarse.
> Maybe your welders have a technique to reduce warp age.
> Do you have a lathe big enough to machine this?
> Hank
> --------------------------------------------
> On Sun, 11/30/14, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Subject: Re: [PSUBS-MAILIST] Gamma hatch
> To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
> Received: Sunday, November 30, 2014, 11:32 PM
>
> Hank,
> I'm sort of leaning back
> towards putting everything in the middle again. For
> some reason the wider the hatch ring the better it makes me
> feel, not sure why that is, maybe just more surface area to
> be in contact. Theoretically if your two mating pieces
> are perfectly flat you wouldn't even need an o ring !
> Also, my welder wants me to put it in the middle.
>
> Brian
>
> --- personal_submersibles at psubs.org
> wrote:
>
> From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Gamma hatch
> Date: Sun, 30 Nov 2014 17:51:28 -0800
>
>
> Brian,
> If the hatch dome ends in the center it would. Did you
> notice how narrow the land is on Gamma, it is like 3/4
> inch. The hatch ring is the same, I was surprised to
> see that.
> Hank--------------------------------------------
> On Sun, 11/30/14, Brian Cox via Personal_Submersibles <
> personal_submersibles at psubs.org>
> wrote:
>
> Subject: Re: [PSUBS-MAILIST] Gamma hatch
> To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
> Received: Sunday, November 30, 2014, 6:09 PM
>
> Seems like if you had the welds in
> the center the pressure would be distributed evenly across
> the 1 1/2" land and hatch ring.
>
> Brian
>
> --- personal_submersibles at psubs.org
> wrote:
>
> From: hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Gamma hatch
> Date: Sun, 30 Nov 2014 10:55:45 -0800
>
>
> And that point is generally at the outer edge of the land.
> Hank--------------------------------------------
> On Sun, 11/30/14, hank pronk via Personal_Submersibles
> <personal_submersibles at psubs.org>
> wrote:
>
> Subject: Re: [PSUBS-MAILIST] Gamma hatch
> To: "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
> Received: Sunday, November 30, 2014, 1:54 PM
>
> You would think the weld
> point should be directly below the weld point where
> the
> hatch dome meets the ring. This would transfer the
> load
> straight down.
> Hank
> --------------------------------------------
> On Sun, 11/30/14, Brian Cox via
> Personal_Submersibles <personal_submersibles at psubs.org>
> wrote:
>
> Subject: Re:
> [PSUBS-MAILIST] Gamma hatch
> To:
> "Personal Submersibles General Discussion" <
> personal_submersibles at psubs.org>
> Received: Sunday, November 30, 2014, 1:51
> PM
>
> Good information Alec,
> thanks !
> I'll have it turned
> afterward of course but no need to take
> off
> more metal than necessary.
>
> Brian
>
> ---
> personal_submersibles at psubs.org
> wrote:
>
>
> From: Private via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
> <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] Gamma hatch
> Date: Sun, 30 Nov 2014 13:30:18 -0500
>
> Careful! If you weld a ring
> on the way you describe with the
> weld in
> the middle, the weld shrinkage on either side of the
> head wall can bend the SS, leaving you with a
> curved SS
> ring. I can tell you from painful
> experience the amount of
> deflection can be
> amazing, we're not talking a few
>
> hundredths... In my case it was about a quarter
> inch.
> I'd
> recommend cutting the head so it
> meets the ring at the
> outside corner.
>
> Best,
>
> Alec
>
>
>
> > On Nov 30, 2014, at
> 11:36 AM, Brian Cox via
>
> Personal_Submersibles <personal_submersibles at psubs.org>
> wrote:
> >
>
> > Hank,
> > I think I'm
> going to have a shop
> down the road turn
> that elliptical head so that the edge
> comes
> right in the middle of the bottom of the ring, still
> need to talk to the welder to see what kind of
> edge he
> wants. With the hatch I'm
> thinking of welding a large
> pipe segment on
> there because there's nothing to grab onto
> for the lathe.
> >
> > Brian
> >
> > --- personal_submersibles at psubs.org
> wrote:
> >
>
> > From: hank pronk via Personal_Submersibles
> <personal_submersibles at psubs.org>
> > To: Personal Submersibles General
> Discussion <personal_submersibles at psubs.org>
> > Subject: Re: [PSUBS-MAILIST] Gamma
> hatch
> > Date: Sun, 30 Nov 2014 07:57:38
> -0800
> >
> > Brian,
> > I will look forward to a picture of your
> CT and
> hatch. In particular I would like
> to see how you
> transition from the
> elliptical portion to the 1 1/2in wide
>
> ring.
> > Hank
> >
> --------------------------------------------
> > On Sun, 11/30/14, Brian Cox via
> Personal_Submersibles
> <personal_submersibles at psubs.org>
> wrote:
> >
>
> > Subject: Re: [PSUBS-MAILIST] Gamma hatch
> > To: "Personal Submersibles General
> Discussion" <personal_submersibles at psubs.org>
> > Received: Sunday, November 30, 2014,
> 10:44 AM
> >
> > Hi
> Hank,
> > I bought two
> > stainless rings 1/2" thick by 1
> 1/2" wide (18" id).
> Which
> > will be welded on to the conning tower
> and the hatch,
> then a
> >
> o ring groove put in the hatch side. With the
> drop I
> > was able to get
> 6 - 6" disks which I'm going to
>
> make
> > into electrical inserts that will
> go into two of my
> > viewports.
> > Conning tower getting welded today (
> 8
> viewports) and
> > also
> working on the other viewports on the sphere, got
> two
> > welder friends that
> I have working on them, both 30+
> years
> > of commercial welding experience !
> >
> > Brian
> >
> > --- personal_submersibles at psubs.org
> > wrote:
> >
> > From: hank pronk via
> Personal_Submersibles <personal_submersibles at psubs.org>
> > To: Personal Submersibles General
> Discussion <personal_submersibles at psubs.org>
> > Subject: Re: [PSUBS-MAILIST] Gamma
> hatch
> > Date: Sun, 30 Nov 2014 05:39:19
> -0800
> >
> > Brian,
> > What did you do for the hatch seat on the
> conning
> > tower. Is it stainless or
> did you do like Gamma
> has, a
> > layer of stainless welded on.
> > Hank
> >
> --------------------------------------------
> > On Sat, 11/29/14, Brian Cox via
> Personal_Submersibles
> <personal_submersibles at psubs.org>
> > wrote:
> >
> > Subject: [PSUBS-MAILIST] Gamma hatch
> > To: "PSubs" <personal_submersibles at psubs.org>
> > Received: Saturday, November 29, 2014,
> 8:30 PM
> >
> >
> Hank,
>
>
> > Do you know how big the shaft is that goes
> through the top
> > of
> your hatch? Have you every had to
>
> disassemble it
> > ? My hatch is
> pretty much identical to
> Gamma's,
> > I'm in the process of cutting in a
> little
> viewport in
> >
> and also that rotating hatch closure shaft /
> thru hull
> >
> deal. Seems like at least a 3/4"
>
> shaft
> > would be in
>
> > order. Brian
> >
>
> > -----Inline Attachment Follows-----
>
> >
> >
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