Re: [PSUBS-MAILIST] casting acrylic origins

[Jim Rudholm <jimrudholm@gmail.com>]

I visited Bruce at his studio sometime after he had cast hemispheres
for submersibles. I saw some of the parts that did not make it, one
hemisphere cured at the bottom and top, but the middle 10" did not
polymerize and the liquid drained away when taken out of the mold. As
I recall he mixed batches in 5 gal. plastic buckets, but no mention of
curing cycles, temps, etc. His autoclave must have been 60" in
diameter.
I've looked for resin with no luck also.
Jim R.

On Sat, Jul 17, 2010 at 10:33 PM, Alan James <alanjames@xtra.co.nz> wrote:
> Hi Dariusz,
> I'd like to know all those details also.
> I spent quite a bit of time trying to track down some acrylic resin
> to have a go at casting it. But no luck at the time.
> I guess if you could track down the raw material you could request
> information from the supplier.
> When I was casting polyester resins I had a lot of information from the
> supplier on catalyst percentages, in relation to casting size
> & temperatures at wich the casting was being done.
> I read somewhere that the autoclave pressure was 70psi.
> If you find any information on this I'd be interested to hear.
> Regards Alan
>
> ----- Original Message ----- From: "Dariusz Hoffmann"
> <darekhoffmann@gmail.com>
> To: <personal_submersibles@psubs.org>
> Sent: Sunday, July 18, 2010 12:31 AM
> Subject: Re: [PSUBS-MAILIST] casting acrylic origins
>
>
>> Very interesting, Alan. But this document is lack of details, how to
>> cast it. What temperatures, time and pressure inside the autoclav.
>>
>> This is also explained in Stachiw book, site 707, but also without
>> details I mentioned above. I have a copy without a cd-rom that
>> contains additional documents, maybe the info is on those documents ?
>>
>>
>>
>>
>> 2010/7/17 Alan James <alanjames@xtra.co.nz>:
>>>
>>> Here's another link to the origins of large acrylic castings.
>>> http://www.brucebeasley.com/Apolymon/Apoly.htm
>>> This is a more detailed story than my last post on Bruce Beasley.
>>> It is truly impressive when you look at the scale of what he was doing
>>> & the complex nature of it.
>>> There's even a photo of the autoclave with North West Native American
>>> art on it.
>>> This next link is a paper by Stachiw to the navy outlining the benefits
>>> & problems encountered with casting domes.
>>>
>>> http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2&doc=GetTRDoc.pdf&AD=AD0776587
>>> Regards Alan
>>>
>>
>>
>>
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