[PSUBS-MAILIST] PVHO rules

Sun Apr 21 19:23:10 EDT 2019

Hank,
that was great of River to help out!
If it were me I would definitely machine it seeing you have to machine
the clamping area off on a pressed dome anyway. Way less work in
every way. 
BTW glass artists can ramp the temperature of their kiln down over
2 weeks with thick art work. May be ideal to find a local one.
I am full of suggestions lol.
Alan

> On 22/04/2019, at 10:49 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan, here is the drawing of the window, big thanks to River for helping with that.  I think it may be easier to just machine it also .  I have sourced the acrylic at 8 inches think already.  I am just waiting to finalize the frame seat design before I pull the trigger.
> Hank
> On Sunday, April 21, 2019, 4:33:47 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hank,
> If it is just 3" deflection then you would need to go to a 8" thick acrylic if
> you machined.
> Just thinking there would be less waste around the perimeter on a machined
> dome as apposed to a pressed dome & you would need to do some machining
> & polishing on a pressed dome anyway.
> Might be a lot easier to machine it & build a small oven, or if you know a potter
> or glass blower with a suitable kiln, get them to anneal it.
> Alan
> 
>> On 22/04/2019, at 9:40 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Alan,
>> The lucky thing is it only has approximately 3 inch deflection and I will use hydraulic pressure.
>> Hank
>> 
>> On Sunday, April 21, 2019, 2:31:25 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> Hank,
>> Spelling mistake. Pressure is going to be HUGE.
>> Alan
>> 
>>> On 22/04/2019, at 8:28 AM, Alan <alanlindsayjames at yahoo.com> wrote:
>>> 
>> 
>> Hank,
>> I had a go at forming an acrylic ring out of a straight piece of 1" thick
>> cast acrylic, using a modified kitchen oven.
>> At forming temperature the acrylic was like the hardness of eraser rubber.
>> Maybe there is technical literature on what shore hardness it actually is at
>> forming temperature. Anyway if you are forming a 5" block the pressure
>> Required is going to be used.
>> When I had a 1" thick dome blown for me they had to stop & get thicker
>> Clamping rings made.
>> Emile or Greg may like to comment on this as they have had a lot more experience.
>> You will need a temperature controller for a kiln, & program it for your requirements.
>> It will be a few days in the oven I would imagine.
>> If you machine it, can you get away with not heat treating it afterward?
>> I would imagine the stress would only be superficial.
>> Alan
>> 
>> 
>>> On 22/04/2019, at 2:11 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> 
>>> Hi All,
>>> I am looking for the actual PVHO rules for Acrylic forming.  I can find all the references to the rules but not the rules.  I am planning to make a 5 inch thick 60 degree Hemispherical segment either from forming  or from machining out of a thick slab.  I prefer to form it because I will need an oven to heat treat it after anyways, but I don't want to form it without the rules.
>>> Hank
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>> 
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