[PSUBS-MAILIST] thru hulls

Wed Mar 18 15:20:46 EDT 2015

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 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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