Thanks
everyone for the replies. I’ll go
with the rings one way or another.
I have a question about making them. When you start with the flat bar, how do you get the ends to
curl on the same radius as the rest of the band? I’m thinking I will have to come up with rollers at least 6”
OD. That would mean both ends of
the bar will have a couple of inches that aren’t rolled. Do you cut the bar extra long, roll it
to desired radius and then trim it to length to get a fully rolled piece? Daniel I sure would appreciate any
pictures you may have of the rings, especially if you took any during the
process of making them. Also would
appreciate anyone with pictures or dimensions and specifications on the rolling
fixtures. This sounds like
something that’s going to take a little time to put together and get used to
working with. Of course, it would
have to be something that has to be done early in the project and can’t wait
till later. I do, however, appreciate the fact that I will be doing
it myself and learning another aspect of metal-smithing in the process.
Thanks as
Always and Kind Regards,
Cliff
McDonald
-----Original
Message-----
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On
Behalf Of daniel@tordaca.com
Sent: Thursday, August 11, 2005
9:57 PM
To:
personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST]
Lengthwise internal supports
I've
got another mechanical engineering question for you:
I've
been trying to think of a way to simplify the internal bracing on a cylindrical
pressure hull. The 'T" rings
that are commonly used for internal stiffening seem to be a difficult part to
make and I can't find a good (cheap) source for them. There are plenty of fabricators that would love to make
several of them when I'm ready but the cost for this is greater than the total
cost of a rolled cylinder and the endcap / bulkheads (which I can fab
myself). I could reduce cost by
cutting small sections of the 'flat ring" portion out of sheet steel, and
try to roll the bands myself but this is going to take a lot of cutting,
welding and piecing together. I
think the total strength of a pieced together T-stiffener would be compromised
as well.
Has
anyone ever run the majority of internal bracing lengthwise through a
cylinder? Since the main portion
of the pressure hull is a straight cylinder, it would be pretty easy to run
some ordinary channel or angle iron the length of the cylinder. Spaced about a foot apart and with
internal bulkheads spaced at reasonable distances (for example, one bulkhead
centered in a 48" OD by 96" long cylinder), I think this would be as strong
as T-rings spaced every foot. It
would be much easier to build and weld, should reduce flexing and twisting, and
would make length wise tubing and wiring runs tuck away a little neater.
Thoughts?
Thanks
and Kind Regards,
Cliff
McDonald
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