[PSUBS-MAILIST] annealing acrylic

[Alan James]

Brian, 
what sort of an electric oven?
I formed some thick acrylic & had to raise the temperature by 1C every 10 minutes
& drop the temperature by 1C every 15 minutes & yes it took all night.
The thermostat on a normal kitchen oven doesn't have enough accuracy & the elements
are too high powered for subtle changes in temperature. I ended up cutting a hole out between
the warmer draw & oven & using the warmer draw element to heat the oven.
There are kiln temperature control units on ebay that are a reasonable price.
Alan


________________________________
 From: Brian Cox <brian at ojaivalleybeefarm.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Tuesday, March 25, 2014 1:32 PM
Subject: Re: [PSUBS-MAILIST] annealing acrylic
 


Yes, I have the annealing schedules.  I have an electric oven and two digital thermometers, one I'm going to put in a piece of acrylic and the other one I'm going to use to monitor the oven temperature itself .  I'm worried that the thermometer in the acrylic won't register until it gets heated throughout, and so then the oven temp might go higher than it should.  So between the two readouts I can heat it gradually up.  It'll be a long night.
 
Brian

--- hanker_20032000 at yahoo.ca wrote:

From: hank pronk <hanker_20032000 at yahoo.ca>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] annealing acrylic
Date: Mon, 24 Mar 2014 17:22:32 -0700 (PDT)


Brian,
Are you going to anneal your windows yourself?  
Hank 



On Monday, March 24, 2014 6:03:10 PM, Brian Cox <brian at ojaivalleybeefarm.com> wrote:
 
Used my polarized lenses on the newly cut piece and it appears clouded throughout the whole piece.  Where as another piece I have, you can clearly see a stress area around where it has been drilled. 
 
Brian
 

--- emile at airesearch.nl wrote:

From: "Emile van Essen" <emile at airesearch.nl>
To: "'Personal Submersibles General Discussion'" <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] annealing acrylic
Date: Mon, 24 Mar 2014 22:40:46 +0100


As far as I know it is
only cast.
 
Regards, Emile 
  
Van:Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] Namens Brian Cox
Verzonden: maandag 24 maart 2014
20:37
Aan: PSubs 
Onderwerp: [PSUBS-MAILIST]
annealing acrylic
  
I'm planning on annealing my viewports,  does anyone
know if the acrylic from the factory is pre-shrunk ? 
  
Brian _______________________________________________
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