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Re: [PSUBS-MAILIST] Aqua Jet Cutting Acrylic
"Don't tell me for what it was desigend for, tell me what it can do in this situation.."
- Apollo13 Flightdirector -
Most things on board Kraka, Nemo and even Euronaut are never designed for using in submarines.
My Diesel is from a Rescue-boat, the maingear from a work boat the
propeller from a Fishing vesel, the underwater Dc motor from a CNC-milling machine.
The shaft seal from a pump. And so on - I can calculate the function of the most things, or my friends can do. But I fell much more safer for example in Peppers sub in greater deep after the unmanned deep test. And in the diver chamber after the unmanned and one day later manned test.
I give her my own private opinon of saftey factors:
01) Calculate it, build it to the rules, double it and test it. 100%
02) Calculate it and test it. 90%
03) Just Calculate it. 30%
04) Just Test it with double force. 80 %
05) Just build it in and dive 10-40%
Number fife depents clear on your personal skill.
regards carsten
<clientes@tolimared.com> schrieb:
> Hello Carsten, folks...
>
> Risking that i get a lot of fire from our acrylics schoolastics
> here...i admit i did it too ...i simply got my viewports, mounted
> them, tested them, and considered them safe to 1/3 of testing depth.
> (less than Carsten feel save with the diver chamber).
>
> I really apreciate stachiws work - but what concerns safety my aproach
> is: no text - recommended and citated it may be - is the final word in
> my submarine. My own testing is. - ABS, GL, ASME, The Professor... -
> all valuable suggestions - a point to start...
>
> When i hear: "the world is flat and if you sail out there you fall
> over the edge..." - i want to know - and where exactly IS the edge and
> how does it look like? (the chineese have not seen it, the arab have
> not seen it...)
>
> I see it a good scientific approach to take all tensions out of a
> material to get a good baseline for scientific experiments especially
> if you have a lot of money to be scientific correct...
>
> I am not so fine with the aproach that what is excommunicated from
> ASME church (like sheet material) is of devilish nature and unsafe by
> definition of WHAT? - ...the text ?...
>
> Carsten, I see with amusement that you have one of those devilish
> things on your boat too..., Peter, Emile and Reinhard did the same...
>
> Finally ...anyone has his own philosophy...what is safe. Is it safe if
> authorities aprove it - if text about it exist - if you test it out
> personally? Is anything in life save anyhow? What kind of safety rule
> apply here?
>
> We discussed it earlier, even classification organisations have
> different philosopy on that. ABS going for paper - GL for test.
>
> Comming back to baseline - apply 1/3 rule and keep cycle problem in
> mind do a regular testing - you might - possibly - survive... or is it
> uncorrect to say this on this forum because you might trigger
> unresponible engineering behavior...
>
> Kindest Regards,
> Wil
>
>
>
>
>
>
> Quoting MerlinSub@t-online.de:
>
> >
> > My two flat water cut acrylic windows in the bulkhead
> > to the diver lock out chamebr just resistant
> > and pass the 320 meter (1000 feet) pressure test.
> >
> > In manned operation they will not see more than 250 m deep.
> >
> > Ist maybe whise to purchase the raw material in a industrial
> > shop with some description - not nessesary in the small shop
> > at the corner.
> >
> > I test my windows and I know that Peter, Emile
> > and Reinhard did the same.
> >
> > And milling acrilic is nearly same cheap as water cutting.
> >
> > regards Carsten
> >
> >
> > <clientes@tolimared.com> schrieb:
> >> May i suggest a practical approach on this...
> >>
> >> The core of the problems seems to be that many of us just want to use
> >> a simple acrylic disc piece that you can get in a normal acrylic store
> >> - where they do decorative items more than submarines - and use it as
> >> a viewport. The truth is when you get your arcylic disk you do not
> >> know exactly what process it is trough or not - it looks good - and
> >> you do not want to build a computerized heating facility just to be in
> >> peace with the Professor or ABS you also do not want to convert in
> >> acrylic scientific you just want to know what is safe.
> >>
> >> The question that arises is : IF they did NOT anything right in the
> >> factory - (which is a remote or not so remote posibility) what is the
> >> depth i can do with this - and still be on safe side. Is it fine to do
> >> half of stachiew and ABS and forget about all those complicated
> >> proeedings? - or should it be 1/3 ?
> >>
> >> So i would suggest somebody who has a water yet and a hydraulic pump
> >> available cuts out a model series 1:2 from sheet material and tests it
> >> to destruction in a simple mounting inside a hydraulics cylinder -
> >> with and without annealing...shrinking...
> >>
> >> And hopefully publishes this - of course no guarantee - on this forum.
> >>
> >> What is of interest for us all is what is the DIFFERENCE - and a
> >> educated guess on that.
> >>
> >>
> >> Cheers Wil
> >> (concretesubmarine.com)
> >>
> >>
> >>
> >>
> >>
> >
> >> Quoting irox <irox@ix.netcom.com>:
> >>
> >> >
> >> > [I have to admit I'm a little shy about posting to this thread given
> >> > some of the things people have said recently, but, here goes anyway...]
> >> >
> >> > Other than Dr. Stachiw stating in his book that all Acrylic viewports
> >> > require annealing, there are some other things I would consider when
> >> > thinking about this question.
> >> >
> >> > Cast Acrylic viewports require annealing. I expect cast Acrylic to be
> >> > closer to 'prefect' than any form of cut Acrylic, but it still requires
> >> > annealing.
> >> >
> >> > Other than annealing, you are also required (by ABS[1]) to preform
> >> > a shrink cycle. The equipment and effort required for the shrink
> >> > cycle is pretty close to what you need for annealing, so skipping
> >> > the annealing process wouldn't save much anyway.
> >> >
> >> > Ian.
> >> >
> >> > [1] - Yes, yes, I know, psub builders are not required to conform to
> >> > any ABS standards...
> >> >
> >> > -----Original Message-----
> >> >> From: Brent Hartwig <brenthartwig@hotmail.com>
> >> >> Sent: Aug 22, 2007 10:49 AM
> >> >> To: personal_submersibles@psubs.org
> >> >> Subject: [PSUBS-MAILIST] Aqua Jet Cutting Acrylic
> >> >>
> >> >>
> >> >>
> >> >> Hello Joe,
> >> >>
> >> >> I agree with your approach. I was pursuing information to prove it
> >> >> or not, if the information was to be had from the groups knowledge
> >> >> base. I plan to anneal my aqua jet cut view ports, unless I get
> >> >> good solid data otherwise. I was just interested in finding out if
> >> >> I had found a way to cut out one step out of the process.Brent
> >> >>
> >> >> P.S. It looks like Frappr.com is down for a bit.
> >> >>
> >> >>> From: joeperkel@hotmail.com> To: personal_submersibles@psubs.org>
> >> >>> Subject: RE: [PSUBS-MAILIST] Open Discussion's Allowed in PSUB's
> >> >>> Mailing List> Date: Wed, 22 Aug 2007 10:57:43 +0000> > Brent,> >
> >> >>> Something like the acrylics issue, my approach is to consider all
> >> >>> ideas > "suspect" until proven otherwise.> > If there is no
> >> >>> reference to the "non-annealing" of water jet cut acrylics in > a
> >> >>> highly specialized and expert Stachiw type reference, then it is
> >> >>> best to > "assume" it to be a required process based upon the
> >> >>> previously existing > processes.> > Joe>
> >> >
> >> >
> >> >
> >> >
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