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Re: [PSUBS-MAILIST] Hatch fabrication dilemma

I'm hoping for some design input. I am doing final design on the sleeve assemblies that the forward thrusters will pivot on. I plan on a final ID of 1.5 inches and an OD of about 2.5 inches. This will allow adequate space to machine a seal chamber as well as provide more than adequate strength. Because the welding will shrink and distort the tube I plan on doing final machining after welding. I plan on welding the sleeve into a 3/4 inch thick and 5 inch diameter flat disc prior to machining. after this I plan on cutting a five inch hole in the hull and welding the disc in place. I feel that this method will put the final weld distortion far enough away so as to not cause distortion of the sleeve. My hull is 48 inches in diameter and 1/2 inch thick.
Does this sound reasonable to those of you who have been there before or do you have better ideas. 

Thanks in advance!

Best Regards,
Jim Kocourek
----- Original Message ----- From: "James Frankland" <james@guernseysubmarine.com> 
To: <personal_submersibles@psubs.org>
Sent: Wednesday, October 17, 2007 2:46 PM
Subject: Re: [PSUBS-MAILIST] Hatch fabrication dilemma



Hello Alec.
I dont suppose you have any pictures of the hatch dilemma you could share with us? Im particually interested in seeing how you get on as im going to be doing my own hatch very soon.
Did you make a jig or cramps of any sort to hold the ring and dish together for welding?
I was thinking of making a jig that would hold the ring down tight and cramp the dish on top to keep it all rigid to minimise distortion. But im not sure if thats needed. What do you think? 

Anyway, good luck.  i hope it doesnt take to much fixing.

James
----- Original Message ----- From: "Smyth, Alec" <Alec.Smyth@compuware.com> 
To: <personal_submersibles@psubs.org>
Sent: Wednesday, October 17, 2007 5:22 PM
Subject: RE: [PSUBS-MAILIST] Hatch fabrication dilemma


Phil, you apparently replied but didn't type anything?

Thanks,

Alec
The contents of this e-mail are intended for the named addressee only. It contains information that may be confidential. Unless you are the named addressee or an authorized designee, you may not copy or use it, or disclose it to anyone else. If you received it in error please notify us immediately and then destroy it. 

From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Phil Nuytten
Sent: Wednesday, October 17, 2007 11:22 AM
To: INTERNET:personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] Hatch fabrication dilemma






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