From: "Peter Madsen" <peter@submarines.dk>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: [PSUBS-MAILIST] Metal Fabrication
Date: Tue, 17 Jul 2007 14:55:13 +0200
Sirs,
For the UC3 I make use of a mix of ox acetylene cutting done by hand by my
self - and a company cutting with the same technique but in a CNC machine.
With practice cutting steal by hand can be very precise - not CNC but nice
- and very cheap. Most parts like the bulkheads and frames was hand cut for
UC3 - and it was the least of my problems. I often mark up the plates using
models cut from cardboard or drawings made by chalk directly on the raw
steal plates.
For hull welding I use a type of MIG welding with cord this is filled with
a protective material - and with Ar - CO2 mix gas protection. This method I
exceptionally productive and an important reason that the project can be
made. I often have to make very big welds - fusing 15 mm and 20 mm steal -
and I don't have all that much time.
With these two tools - the big welder and the hand held ox acetylene
cutting burner - I guess anyone can make his own IOWA class battleship - it
just a matter of determination.
I must stress - that in my humble opnion - learning the basics of steal
constrution is a must for a person who wish to make a submarine. To bye
that service - is simply too expensive for anyone but millionaires. Its not
just a pressurehull - it is hundereds of small thing that needs this
kind of qualifications.
Best Regards,
Peter Madsen
----- Original Message ----- From: "Joseph Perkel" <joeperkel@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Sunday, June 17, 2007 2:03 PM
Subject: Re: [PSUBS-MAILIST] Metal Fabrication
Frank,
Thanks.....I believe this is worth it, particularly the smooth /
non-stressed cuts. If I read you correctly, that $5,200 was total for the
material, cold forming, and cuts to date for your main pieces....not too
bad!
Tell me please, what does all that weigh approximately at this point? From
that, I will do a rough....very rough extrapolation of what I might expect
to get to that point.....better than blind guessing.
Joe
From: ShellyDalg@aol.com
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Metal Fabrication
Date: Sat, 16 Jun 2007 19:37:16 EDT
Regarding "big machining".......yes, it was expensive. To cut the bands
for
the hatch and three windows with the water jet was $610, but only $200 to
roll them into circles. I had already purchased the steel sheet.
I could have cut the bands myself with the torch for next to no cost (
just
oxy and acetylene ) or had them sheared, but I couldn't find a shear to
cut
3/8 steel of this type. Although the AS 516-70 steel isn't that hard, no
one
wanted to risk breaking their shear. The shop also cut the circle
flanges for
these parts. One inch thick and 2 inches wide, 2 at 24 inch O.D. and 2
at 16
inch O.D. plus the hatch ring at 1-1/2 inch thick by 2 inch wide and the
dome
lid ring at 1 inch by 2 inch.
The water jet went through that steel like butter, no heat applied, and
the
cut is amazingly smooth.
Total for material and labor for the three window tubes, one band at 84
inch
diameter, hatch tube, and five thick rings was $2800.
Still, with all the steel here now, my total cost for the pressure hull
pieces is $5200.
That is right where I had budgeted, and the quality is great.
If I had cut all this steel with my torch, I'd still be grinding the
edges
for several days and the steel edges would have had a lot of heat stress
added
to them.
Bottom line......Pricey but worth every cent.Frank D.
************************************** See what's free at
http://www.aol.com.
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