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Re: [PSUBS-MAILIST] Aqua Jet Cutting Acrylic

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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