Re: [PSUBS-MAILIST] Stiffener question

[MerlinSub@t-online.de (Carsten Standfuß)]

Hmmm - maybe I am not so much familar with scientific terms.. 
but description seems right - more familar with drawings..  

What I mean looks more or less like: 
    
     hole          hole         mouse cut
==========================================  Hull
IIII________IIIII________IIIIII________III  30% high
IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII  30% high	
IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII  30% high	
=========================================== frame end
    60% long  40%   60%    40%    60%  

Just imagine that the frame is turned around inside 
a cylinder - or turn one of the button on you monitor heavy 
to the end left (or right) scale.. 

I would like a forum which can exchange CAD Drawings.. 

Carsten

Alec Smyth schrieb:
> 
> Uhmmm... on second thought there is one sentence I don't get. "The Length of
> the hole is clear greater as the length of the rest frame between them,
> about 40/60 I think."
> 
> Let me describe what I'm talking about in very scientific terms. Imagine the
> stiffener is made of cheese and has a height of 3 cm. A large mouse comes
> along. The mouse's mouth is about 2 cm wide, and semi-circular. The mouse
> takes a bite off the edge.
> 
> If the result is one of your "long-holes", then it would have a diameter of
> 2 cm. But because its a semi-circle, it would reach only 1 cm towards the
> center of the stiffener. So if I understood your description, the cheese
> might still be classifiable since 1 cm is a third of the frame depth.
> 
> Now to the sentence above that I didn't understand; are you referring to the
> distance between successive bites if the mouse rotates the cheese and bites
> off another bit?
> 
> thanks,
> 
> - Alec
> 
> -----Original Message-----
> From: MerlinSub@t-online.de [mailto:MerlinSub@t-online.de]
> Sent: Monday, August 20, 2001 12:43 PM
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Stiffener question
> 
> Hi Alec - semicircular nicks  means lonh-holes right ?
> I look to my rules book - and surprice - no description -
> only the term "has to be calculate".
> 
> But than I look to the internal pictures of the Seahorse Offshore
> sub - a Boat with classefication. The long-holes have about 30
> Percent of the stiffteners high. The Length of the hole is clear greater
> as the length of the rest frame between them, about 40/60 I think.
> 
> The problem is that the welding frame/shell has to be of the close type
> - means has to go inside the longhole to the other side - this indicate
> that the hole must have a size so you can work with the stick or pistol.
> Indicate a hole high of at least 1 inch minimum - and thats indicates
> a frame high of about 3 inch at least.
> 
> Maybe on smaller frames it is better to drill holes in the stiffteners
> quite near the shell and before you weld them into the shell.
> The distance "near the shell" means there should still stay of about
> a half inch of the stiffteners - so you can make easy a close weld.
> 
> Hope the language was not to funny..
> Carsten
> 
> > Alec Smyth schrieb:
> >
> > SOMEWHERE I once read you could machine semicircular nicks on
> > the external radius of internal stiffener rings. These are useful for
> > running longitudinal wires or piping while keeping things protected. I
> > think the allowable radius of these semicircles was expressed in terms
> > of the of the stiffener diameter.
> >
> > Problem is, I can't find where I read this. Does anyone have this
> > info, or at least some rule of thumb?
> >
> > thanks!
> >
> > - Alec
> >
> >