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Re: [PSUBS-MAILIST] Stainless hatch ring

Title: Message
Alec,
            Now is that aluminum 6061 an excellent grade for the ocean salt water?  I was thinking of using aluminum "rails" to secure my pressure hull and other components to the main body of my sub.  I will have to be careful to insolate inbetween dissimilar metals but I'm thinking that the aluminum might be a better alterative to stainless in this case since I would not be having to weld the rails to anything,  they would be through bolted to the ferro-cement.  I would probably use stainless bolts however.  The aluminum would no doubt be cheaper than the stainless also.
 
Brian
----- Original Message -----
From: Alec Smyth
Sent: Friday, November 11, 2005 07:55
Subject: RE: [PSUBS-MAILIST] Stainless hatch ring

The aluminum is 6061, and the land is not epoxied, unless you consider epoxy paint.
-----Original Message-----
From: Brian Cox [mailto:ojaivalleybeefarm@dslextreme.com]
Sent: Friday, November 11, 2005 1:55 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Stainless hatch ring

Alec,
         What grade aluminum is that hatch ring?   And is the steel land epoxyed?
 
Thanks
 
Brian
----- Original Message -----
From: Alec Smyth
Sent: Thursday, November 10, 2005 14:03
Subject: RE: [PSUBS-MAILIST] Stainless hatch ring

I'm afraid not, my hatch ring is aluminum and the land is steel. On the K-250 they are both steel.
-----Original Message-----
From: Brian Cox [mailto:ojaivalleybeefarm@dslextreme.com]
Sent: Thursday, November 10, 2005 4:20 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Stainless hatch ring

I guess that would work, just do the part that is on the sub stainless.  On Solo both your mating pieces are stainless aren't they?
 
Thanks
 
Brian
----- Original Message -----
From: Alec Smyth
Sent: Thursday, November 10, 2005 12:59
Subject: RE: [PSUBS-MAILIST] Stainless hatch ring

Brian,
 
I think you're fine as is. The one that's really nice to have in stainless is the ring that your hatch lands on, because in getting in and out you scratch tha paint very easily there. But that said, all the home built subs I've seen so far have steel lands due to the cost of a large stainless ring. The "pro" subs have SS there, we just repaint. 
 
rgds,
 
Alec
-----Original Message-----
From: Brian Cox [mailto:OjaiValleyBeeFarm@dslextreme.com]
Sent: Thursday, November 10, 2005 2:00 PM
To: Personal_Submersibles@psubs.org
Subject: [PSUBS-MAILIST] Stainless hatch ring

When I put together my domed hatch ( in my machining class)  I first had the hemisphere fabricated and then I had a 2" ring welded to the edge of the hemisphere.    At the time I was not really clear on how everything was going to come together and now in hind sight I realize that the 2" ring that I welded on should have been stainless steel instead of what I used. 
 
My question is,  can I fabricate a stainless ring and connect it to what I have now ?   I could remove some of that material ( the ring part ) which is 3/4" thick so as to reduce the weight.  I'm afraid if I don't make that ring part thinner the hatch will be too dam heavy.
 
If I do add this new stainless ring should I just weld it to the existing ring?  and then put it in a giant lathe and machine it true?
 
Here is a picture of the hatch cover:
 
 
Thanks
 
Brian