Date: Wed, 22 Aug 2007 16:00:05 -0700
From: noperiscope@yahoo.com
Subject: Re: [PSUBS-MAILIST] Aqua Jet Cutting Acrylic
To: personal_submersibles@psubs.org
This is a good approach. Its very easy to build your own test tool....just build a small pressure vessel that will hold the view port at one end and fill it with water....NOT AIR...NOT AIR..NOT AIR...then put a wall between you and the test port and keep pumping till it breaks....use a gauge that will set a needle at the highest pressure or just watch it....the goofy guys on the discovary channel do this crap all the time and I know you're all smarter then them....use flat 3/4 inch off the shelf acrylic and you'll be amazed how strong it is....or just do what some one else did that I know...keep going till you hear something crack....You guys are making this much harder than it really is...Your not building an ABS classed vessel so let the good times roll....
DJB....
clientes@tolimared.com wrote:
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 :
>
> [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
>> 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>
>
>
>
>
> ************************************************************************
> ************************************************************************
> ************************************************************************
> The personal submersibles mailing list complies with the US Federal
> CAN-SPAM Act of 2003. Your email address appears in our database
> because either you, or someone you know, requested you receive messages
> from our organization.
>
> If you want to be removed from this mailing list simply click on the
> link below or send a blank email message to:
> removeme-personal_submersibles@psubs.org
>
> Removal of your email address from this mailing list occurs by an
> automated process and should be complete within five minutes of
> our server receiving your request.
>
> PSUBS.ORG
> PO Box 53
> Weare, NH 03281
> 603-529-1100
> ************************************************************************
> ************************************************************************
> ************************************************************************
>
>
************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003. Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.
If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
removeme-personal_submersibles@psubs.org
Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.
PSUBS.ORG
PO Box 53
Weare, NH 03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************