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Rick,
Your kidding about the landing gear, aren't you
?? ....I did not know that and I'm going to wish I hadn't the next time
I'm on a plane. I wonder why they would do that ? I am going to
assume it's a much better way of going it than your average truck
bumper.
Myles.
----- Original Message -----
Sent: Sunday, November 13, 2005 11:25
PM
Subject: Re: [PSUBS-MAILIST] Stainless
hatch ring
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 -----
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
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
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