Re: [PSUBS-MAILIST] Viewport Question.

["Peter Madsen" <peter@submarines.dk>]

Hi James,

0.5 mm is tight, the window frame will shrink during welding, leaving you 
with very small clearance. Do you gain anything by making it that tight ? 
Does it affect burst pressure or tightness if you increase the tolerance ? - 
if not do it. Just my humble opinion.

Regards,

Peter Madsen



----- Original Message ----- 
From: "James Frankland" <james@guernseysubmarine.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, December 11, 2007 12:02 PM
Subject: [PSUBS-MAILIST] Viewport Question.


Hello All.

Quick question regarding viewports tolerance.

Ive started machining and have done 2 at the moment.  Ive machined the depth 
of the bore to be exactly 1.25 inches as per the plans, and the inside 
diameter i have machined to 8 inches plus a clearance of 0.5 mm to allow the 
lense to drop in.  (sorry, the plans are imperial but we're metric here, so 
its a bit of both).

Im not making the acrylic lenses myself, i will buy them (probably from 
psubs store).  Assuming they come in exactly at 8 inches OD, as things are 
they should slot in nice and tight.

But Dan H mentioned to me that he got some slight distortion on the ports 
after welding.

So the question is, do you think 0.5 mm clearance is enough?  Obviously i 
cannot alter the ports once they are welded in, and don't want to have to 
start machining the lenses, they must fit.

You can have a look here as usual.  Some of the text titles are wrong.  I'll 
change them later.

http://www.guernseysubmarine.com/index_files/Page7497.htm

Any thoughts?

Thanks
James




----- Original Message -----
From: Jay K. Jeffries [mailto:bottomgun@mindspring.com]
To: personal_submersibles@psubs.org
Sent: Mon, 10 Dec 2007 20:16:42 -0500
Subject: [PSUBS-MAILIST] Digital Multi-Frequency Scanning Sonar

Here is what looks like a great scanning sonar for a PSUB.  If it is priced
like some of their other products, it should be a great deal.



http://www.imagenex.com/html/881l_imaging.html



R/Jay





Respectfully,

Jay K. Jeffries

Andros Is., Bahamas



A skimmer afloat is but a submarine, so poorly built it will not plunge.





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