[PSUBS-MAILIST] thru hulls

Wed Mar 18 15:47:50 EDT 2015

Brian,
If you have not already done so, you might want to get some silicone  
plumber's grease for the o-rings.
Jim

In a message dated 3/18/2015 2:21:20 P.M. Central Daylight Time,  
personal_submersibles at psubs.org writes:

Concur with this. Larger cross sectional diameters offer improved  sealing 
to rougher surfaces, scratches, etc.  The tradeoff is just the  depth needed 
for the gland and consequent size of parts, machining cost,  etc. 
Sean

On March 17, 2015 8:48:06 PM MDT, Hugh Fulton via  Personal_Submersibles 
<personal_submersibles at psubs.org> wrote:  
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 Discus!

 sion"
<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-MAI!

 LIST]

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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