Re: [PSUBS-MAILIST] thru hull fittings

["Brian Cox" <ojaibees@ojai.net>]

Thanks Alec,   I read a few posts back that your drop weight shaft was like 2" or something,  it seamed rather large was there some reason for that?

Brian
----- Original Message ----- 
From: "Alec Smyth" <Asmyth@changepoint.com>
To: <personal_submersibles@psubs.org>
Sent: Friday, February 27, 2004 1:28 PM
Subject: RE: [PSUBS-MAILIST] thru hull fittings


> With a 1.25" insert, you have added much more reinforcement than the material you removed with a 0.5" shaft hole. If I remember right, the rule of thumb is that you should add twice as much as the hole removed. So it should be sufficient.
>  
> Alec
> 
> -----Original Message----- 
> From: Brian Cox [mailto:ojaibees@ojai.net] 
> Sent: Fri 2/27/2004 3:51 PM 
> To: Personal_Submersibles@psubs.org 
> Cc: 
> Subject: [PSUBS-MAILIST] thru hull fittings
> 
> 
> Hi All,    I am in the process of machining thru hull fittings (316L ss) that will have 1/2" shafts running through them to turn valves, turn rudders, and other functions as well, drop weight, and possibly move trim ballast ;-)     .  The fittings that I am machining at the moment are 1 1/4" od  with the 1/2" id ( for the shaft)  is that 1 1/4"  a big enough chunk of steel to be welded through 1/4" A516 70   or should that OD be larger for some reason?
> 
> Thank You
> 
> Brian Cox
> 
>