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.JoeFrom: 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 EDTRegarding "big machining".......yes, it was expensive. To cut the bands forthe 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 domelid ring at 1 inch by 2 inch.The water jet went through that steel like butter, no heat applied, and thecut is amazingly smooth.Total for material and labor for the three window tubes, one band at 84 inchdiameter, 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 edgesfor several days and the steel edges would have had a lot of heat stress addedto them. Bottom line......Pricey but worth every cent.Frank D.************************************** See what's free at http://www.aol.com.************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. Your email address appears in our database because either you, or someone you know, requested you receive messages from our organization. If you want to be removed from this mailing list simply click on the link below or send a blank email message to: removeme-personal_submersibles@psubs.org Removal of your email address from this mailing list occurs by an automated process and should be complete within five minutes of our server receiving your request. PSUBS.ORG PO Box 53 Weare, NH 03281 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************
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