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RE: [PSUBS-MAILIST] Very Heavy endcaps
Hi Alec,
Thanks for that. Mine will be the same i suspect. I'll have a look through your pictures on the site and see if i can spot the joint anywhere.
Thanks
James
----- Original Message -----
From: Smyth, Alec [mailto:Alec.Smyth@compuware.com]
To: personal_submersibles@psubs.org
Sent: Wed, 7 Apr 2010 09:01:15 -0400
Subject: RE: [PSUBS-MAILIST] Very Heavy endcaps
At least speaking for my individual K-250, the end caps are thicker than
the cylinder and the step is on the inside. There was no machining done
on the heads, just built up weld.
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From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jon Wallace
Sent: Tuesday, April 06, 2010 11:27 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Very Heavy endcaps
James,
Is the inside diameter of the heads equal to the inside diameter of the
hull? Vice-versa? I'm trying to understand where the excess material
is located geometrically. The end caps are not too heavy and I assume
you ordered a minimum thickness of 3/8 inch which is why the sides are
thicker. Kittredge used thicker heads on the K600 than the hull because
the company he built it for insisted on it. As I recall, the ID of head
and hull were identical and the excess material is on the outside of the
hull, and he did not grind it down as the conning tower is. Looking at
the head to hull connection on the outside, you can imagine there would
be an obvious edge because of the two dissimilar thicknesses. However,
some material was used to flair the transition from the head to the
hull. Now, I have no idea what material was used but I'm sure it wasn't
car body filler or anything like that. Without knowing, I suspect that
area was built up with welding filler material and then ground down as
smooth as they were able. Again, from recollection, the length of the
flair, or transition from head to hull, appeared to be about a 2-3
inches. Also on the K600, the same approach was taken with the conning
tower. Kittredge did not grind down the conning tower thru-hull as he
shows in the K350 plans, but instead used build-up on the outside edge
flaring it to the CT itself.
Jon
James Frankland wrote:
> Hi All,
>
> Ive been making some slow but steady progress on my sub.
>
> Im am at the stage where i am starting work on the endcaps. A few
penetrations to go in and then i am ready to assemble the main parts of
the hull together.
>
> But I have what i think is a problem with the endcaps. I specified
the correct thickness as per the plans (3/8ths) but they are spun so
while they are 3\8ths (10mm approx) at the centre, they are 13mm at the
edge.
>
> I dont know the exact weight but they seem extremely heavy to me.
>
> Questions:
>
> 1. Are they to heavy?
>
> 2. Do i need to machine a taper onto the inside diameter to take the
13mm down to 6mm (hull thickness) in a controlled manner or can i just
bevel it for welding? If i do not machine it, there will be quite a
step from 6 - 13mm. I have a feeling it should have a stress reducing
taper like where the main tower shell joins the hull reinforcement ring.
>
> Endcaps link -
> http://www.guernseysubmarine.com/index_files/Page493.htm
> Taper Example link -
> http://www.guernseysubmarine.com/index_files/Page3975.htm
>
> What have other people done at this point??
>
> Many thanks for your advice.
> James
>
>
>
>
>
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