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Re: [PSUBS-MAILIST] Viewport Question.
Hi Alec,
This may sound a bit wierd, but I think that I have a reasonable solution
for determining the flatness of your viewport seats.
Since I assume that the inside of the port is mot machined and/or may also
be distorted finding a stable and centered manderal to mount a dial
indicater to will probably be difficult.
In engine assembly sometimes we use Plastigauge. It is a precisely sized
thread of plastic and is used to determine bearing clearances. By assembling
a bearing with plastigauge in place, then disassembling you can determine
the clearance by measuring how wide the squashed thread is. The wider the
thread, the tighter the clearance. This product is available in several
sizes.
You may be able to machine a plate to be clamped into the port as the window
is and place an array of these plastigauge pieces around the seat, then
measure the results.
The product is available in any decent automotive store.
I hope this helps.
Best Regards,
Jim Kocourek
----- Original Message -----
From: "Smyth, Alec" <Alec.Smyth@compuware.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, December 11, 2007 12:17 PM
Subject: RE: [PSUBS-MAILIST] Viewport Question.
Hi Dan,
I noted your comment about the slight distortion of the viewport seats
after welding. I've made mine rather massive in an effort to avoid that,
but d'you have a tip regarding how I can check whether it worked? I'd
love to get a dial indicator on them, but don't see an obvious way to do
that since they're welded into the coning tower. I'd really like to
check whether they're still flat before the tower goes on the sub, since
it should be possible (though admittedly hard), to refinish them by
turning the whole coning tower on a lathe.
Thanks,
Alec
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From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Dan. H.
Sent: Tuesday, December 11, 2007 8:31 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Viewport Question.
James,
Also be aware that acrylic thickness isn't constant even when cut from
the same sheet. It may be wise to have your acrylic parts in hand
before machining your rings.
The only way to get a truly good fit between the lenses and housing
rings is to do a final machining after the rings are welded into the
hull, but most of us don't have that option. Anything else is just
doing the bet you can do with what happens after welding and the
tolerance of the acrylic you get.
Hey! Nice web site!
Dan H.
----- Original Message -----
From: "James Frankland" <james@guernseysubmarine.com>
To: <personal_submersibles@psubs.org>
Sent: Tuesday, December 11, 2007 6:02 AM
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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