RE: [PSUBS-MAILIST] Aqua Jet Cutting Acrylic

[Brent Hartwig <brenthartwig@hotmail.com>]

Ian, 
 
You make a very good point. My question then would be that since some of the cell cast acrylic I've looked at, states that the acrylic is preannealed at the factory, so does that acrylic need a shrink cycle, if you don't cut it in any way and/or if you aqua jet cut it?

Regards,
Brent Hartwig

> Date: Wed, 22 Aug 2007 12:17:30 -0700
> From: irox@ix.netcom.com
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Aqua Jet Cutting Acrylic
> 
> 
> [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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