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Re: [PSUBS-MAILIST] Stainless hatch ring

Title: Message
the main landing gear pistons of all flying commercial aircraft are plated with hard chrome. it would seem the hydrogen embritttlement problem has been solved there. the question is how much verses stainless. most hydrogen embrilltement can be solved by prolonged bheating at 400 f
rick m
 
----- Original Message -----
Sent: Sunday, November 13, 2005 8:58 PM
Subject: Re: [PSUBS-MAILIST] Stainless hatch ring

Wouldn't chrome plating, in addition to brittleness, hide signs of incipient metal fatigue?
 
Rick
Vancouver
 
 
----- Original Message -----
Sent: Friday, November 11, 2005 12:10 PM
Subject: Re: [PSUBS-MAILIST] Stainless hatch ring

Myles,
 
What is the mechanism of the embrittlement after chrome plating?
Hydrogen ingress?
 I know anodising propagate "kerfwerking" (dont know the english word), it has to do with a little notch that causes a crack,  but that does corrosion too.
 
About chrome and cruiser bikes: "it has to shine, it dont have to work" 
 
Regards emile
Gents,
 
   The chrome plating process makes the metal more brittle.  Brittle in sub = bad.  Save the shiny stuff for other things.
 
Myles.
----- Original Message -----
Sent: Thursday, November 10, 2005 3:17 PM
Subject: Re: [PSUBS-MAILIST] Stainless hatch ring

brian how about just plate the ring with chrome.
rick m
----- Original Message -----
From: Alec Smyth
Sent: Thursday, November 10, 2005 12:59 PM
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