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Re: [PSUBS-MAILIST] extendair
Title: Re: [PSUBS-MAILIST] extendair
Dave,
With the high cost of steel these days, especially SA 516 GR 70 can you justify that much scrap ? You still have to shear the strips for the flange part of the "T" and roll them. It doesn't take that much more time to shear & roll 6 pcs the hard way ?
DL
From: Dave Banks <noperiscope@yahoo.com>
Reply-To: personal_submersibles@psubs.org
Date: Fri, 12 Aug 2005 12:16:08 -0700 (PDT)
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] extendair
Cliff,,,
You really don't need to build a rolling machine for 1.5 by .25 steel. I'm sure there are a few weld shops near you that have one and just have them roll the flat bar for you. Yes, you have it cut long and then trim the ends. But you also need to understand that having them cut in a circular form and welding them together will give you truer circles. This is very important to the integrity of the pressure vessel. I do this for a living and you don't need to have the web rolled on edge, the flange, yes, but not the web. I would not roll them, I would have them water jet cut and then weld them together. Then they would be within 5 or 6 thousands of an inch true. 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
Hello psubbers,
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
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