[PSUBS-MAILIST] thru hulls

Tue Mar 17 22:48:06 EDT 2015

Brian, Best to use the largest O'ring cross section you feel comfortable
with.  You have a bigger tolerance then to wear and machining tolerances
etc.
Sorry I don't know what the pressures or diameters are that you are dealing
with.
One of the things that we do is use FS-3452 Fluorosilicon grease which has a
great life but compatibility may be an issue to check.  The other thing is
to use the oxygen grease which is as slippery as.  Hugh

-----Original Message-----
From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
On Behalf Of Brian Cox via Personal_Submersibles
Sent: Wednesday, 18 March 2015 2:52 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] thru hulls

Right Hugh,  sorry about that, that was the reach on a groover I was looking
at.  Hugh do you have any thoughts on whether a smaller size O ring would do
?

Brian

--- personal_submersibles at psubs.org wrote:

From: Hugh Fulton via Personal_Submersibles
<personal_submersibles at psubs.org>
To: "'Personal Submersibles General Discussion'"
<personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] thru hulls
Date: Wed, 18 Mar 2015 13:26:55 +1300

Hank /Brian
1/8 O'ring is 0.121 depth not .143 for an imperial ring.
Make sure you check properly.
Chs Hugh

-----Original Message-----
From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
On Behalf Of Brian Cox via Personal_Submersibles
Sent: Wednesday, 18 March 2015 1:19 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] thru hulls

Hank,
       Actually the 1/8" O ring calls for a .143 gland depth , and that
would be on each side !  The groove cutters I've looked at did not go up
that high considering the shank has to go in the 1/2" hole.  I'm sure it
could be done, and your right about the surface area , but when you consider
the tolerance of the shaft to the bore we're only talking about .005
difference or so.

Brian 

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion
<personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] thru hulls
Date: Tue, 17 Mar 2015 16:03:35 -0700

Brian,
Sorry, my memory failed me, I just measured a spare o ring for the reach rod
and it is .100 not .125 so it is a bit smaller.  
Hank--------------------------------------------
On Tue, 3/17/15, Brian Cox via Personal_Submersibles
<personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] thru hulls
 To: "Personal Submersibles General Discussion"
<personal_submersibles at psubs.org>
 Received: Tuesday, March 17, 2015, 6:34 PM

 Hank,
        That is an incredibly deep
 groove, and I don't see the reason for it.  I was  considering going with
that size but getting a grooving tool  to go .125 thousandths is a long way
to go, especially in a  1/2" hole !

 Brian

 --- personal_submersibles at psubs.org
 wrote:

 From: hank pronk via Personal_Submersibles
<personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion
<personal_submersibles at psubs.org>
 Subject: Re: [PSUBS-MAILIST] thru hulls
 Date: Tue, 17 Mar 2015 13:26:57 -0700

 Brian,
 Gamma has 1/8 orings, I would go with 1/8 might be more  forgiveness.
 Hank
 --------------------------------------------
 On Tue, 3/17/15, Brian Cox via Personal_Submersibles
<personal_submersibles at psubs.org>
 wrote:

  Subject: [PSUBS-MAILIST] thru hulls
  To: "PSubs" <personal_submersibles at psubs.org>
  Received: Tuesday, March 17, 2015, 3:31 PM

  Hi
  All,
  Starting in on thru hull production.  I will need
  probably close to a dozen of them.  I'm making them
  all to accept a 1/2" stainless shaft, and I will be
  using 1/16"  O rings.  I don't see any
  need to use thicker diameter O
  rings ,  since the deeper O ring grooves
  can be a bit more problematic.   By the time my
  welder finishes all the remaining critical welds I should
  have my thru hulls done.   Also working on my
  forward hard ballast tank, approx. 18" in dia X 5'
  long
  .  Cheers, Brian 

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