[PSUBS-MAILIST] annealing acrylic

[Alan]

Brian,
I was going to suggest earlier that you build a larger oven next to your small
oven & use the small oven to heat it. That way the temperature fluctuations
would be less dramatic.  Possibly make it out of insulation batts & aluminium foil.
you could still use the control unit I suggested. 
Alan

Sent from my iPad

> On 2/04/2014, at 3:49 am, "Brian Cox" <brian at ojaivalleybeefarm.com> wrote:
> 
> Epic Fail !    my attempt to anneal a viewport did not go well.   The temps swings were so great that it was impossible to regulate.  The mass in the oven that I had hoped would moderate the swings made it so the lag time between the heating cycle and when the thermometer sensor saw the temperature change uncontrollable.   And the heat was not even though out the oven as well.
>  
> 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: Tue, 25 Mar 2014 05:35:51 -0700 (PDT)
> 
> Brian,
> I say when in doubt, test.  If your not building a test chamber , you can make your sample window to fit my chamber and I will test it for you.
> Hank
> 
> 
> On Monday, March 24, 2014 7:23:18 PM, Brian Cox <brian at ojaivalleybeefarm.com> wrote:
> Hank,
>           I have the book, that's where the annealing schedules are, they vary quite a bit, there is an absolute minimum time and then there is the original recommended time. The recommended time comes out to be around 51 hours where as the shortened time is maybe half that.  I'm just doing one test piece to start off with.  I was also using the same oven ( a toaster oven I got from Sears for $75 bucks) to heat the welding rod to 250 degrees F before we used the rod ( it had been sitting out for a few days).  I was able to keep the temperature fairly even for the welding rod at 250. 
>  
> 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 17:39:27 -0700 (PDT)
> 
> Brian,
> Do you have the Stachiw book of Acrylics, I can send you mine if you don't have a copy.  There is some pretty important stuff in there.
> Hank
> 
> 
> On , hank pronk <hanker_20032000 at yahoo.ca> wrote:
> Brian,
> How thick is your acrylic?  should take more than a night?
> Hank
> 
> 
> On Monday, March 24, 2014 6:33:09 PM, Brian Cox <brian at ojaivalleybeefarm.com> wrote:
> 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 _______________________________________________ Personal_Submersibles mailing list Personal_Submersibles at psubs.org http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
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