I agree 100% with Dan on the thruster pivots, I've used that same simple method without problems. But I'd like to suggest something different for your electrical connectors. Weld in a flat SS ring similar to the seat for a viewport, which mates with a flat SS bulkhead sealed with an o-ring. When you've settled on your penetrators drill appropriate holes in the removable bulkhead. The advantage is that if your penetrator needs change over time, you just drill additional holes or make new bulkheads, without any welding or cutting. Credit for this penetrator bulkhead practice goes to Phil Nuytten!
thanks,
Alec
________________________________
From: owner-personal_submersibles@psubs.org on behalf of Jim Kocourek
Sent: Sun 12/30/2007 12:36 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Hatch fabrication dilemma
Hi Dan,
Thanks for the input. I had thought of that but was worried about o-ring
joint. Since I will be using lipped seals I should have a bit more
tolerance.
Your plan certainly will be a lot less work! Good stuff!
Thanks,
Jim Kocourek
----- Original Message -----
From: " Dan. H." <jumachine@comcast.net>
To: <personal_submersibles@psubs.org>
Sent: Sunday, December 30, 2007 10:00 AM
Subject: Re: [PSUBS-MAILIST] Hatch fabrication dilemma
> Jim,
>
> Your correct to suspect some shrinkage in the welded part. I don't know
> if you have to go through all that though. It may be easier to machine
> the sleeve with maybe .005 clearance, then weld it in place. The majority
> of the shrinkage will be right below the weld area. After it cools get a
> 1.500 reamer and run it through to open the shrunken area back up. That's
> what I did with mine.
>
> Be sure you make your through hulls long enough to handle the over hung
> load of the thrusters. The one on the K-350 plans should have a greater
> length to diameter ratio. If they're to, short the shafts will gaul.
>
> Dan H.
> ----- Original Message -----
> From: "Jim Kocourek" <kocpnt@tds.net>
> To: <personal_submersibles@psubs.org>
> Sent: Sunday, December 30, 2007 9:57 AM
> Subject: 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
>>>
>>>
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>>> 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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