[PSUBS-MAILIST] annealing acrylic

Thu Apr 3 10:58:13 EDT 2014

Hi Brian,

Ok, thanks.  I'll have to get another lense, ive only got 1, but they are
cheap enough.

Many thanks
James

On 3 April 2014 15:19, Brian Cox <brian at ojaivalleybeefarm.com> wrote:

>  Hi James,
>                    I used a florescent light in a light table that I had.
> The lenses have to be opposing each other and on either side of the
> acrylic.  If you look at your lenses closely you'll see that one side
> is different that the other.  So when they are in line with the light
> source you want them with one " heads and one tails "  .  Then after you
> have them like that then slowly turn the top one you have in your hand to
> reveal the stress layers.  The stress layers are really evident in a piece
> of acrylic that has been drilled, so if you have such a piece try it with
> that .
>
> Brian
>
> --- jamesf at guernseysubmarine.com wrote:
>
> From: James Frankland <jamesf at guernseysubmarine.com>
>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] annealing acrylic
> Date: Thu, 3 Apr 2014 11:35:17 +0100
>
>  Hi Brian,
>
> This might be a dumb question, but how did you manage to get such a nice
> view of the stresses in your viewport?  Ive got a polerizing filer which i
> bought specially, but it didnt seem to work properly.  Are you shining a uv
> light on it or something?
> Thanks
> James
>
> On 1 April 2014 17:01, Brian Cox <brian at ojaivalleybeefarm.com> wrote:
>
>  Hi Doug,
>                     I think I'm going to see what finished windows would
> cost me from Hydrospace.  The chamber for the annealing would need to be
> completely re-thought out.  I was thinking that maybe an enclosed liquid,
> like antifreeze, could be used to circulate through a special chamber that
> would be surrounded with the liquid.  That way you could really get a
> handle on the exact temperature of a circulating liquid. But still you have
> to change the temp, maybe a mixing valve.  But by the time I got through
> with that I could probably buy a number of viewports !
>
> Attached is a shot of the stresses I induced with my bad annealing attempt
>
> Brian
>
>
>
>
>
>
>
>
>  My sympathies Brian. I'm sorry that your experimental annealing didn't
> go well, but as they say, it is always better to try and fail than fail to
> try. It sounds like perhaps you just need to make some modifications to
> your oven to better regulate temperatures, but I'm sure that is easier said
> than done. Are you planning to make another attempt? ~ Douglas S.
>
>
> On Tue, Apr 1, 2014 at 10:49 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 _______________________________________________
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