[PSUBS-MAILIST] PVHO rules

Sun Apr 21 20:09:41 EDT 2019

 Alan,I talked  with Brian Cox because he annealed his own ports.  He is Brilliant in the way he controls the heat.  He uses a variable voltage supply instead of turning the heating elements on and off with a sensor and relay.  He just pre determines the temperature at given voltages and then controls the voltage for constant temperature control.  Just brilliant!Hank
    On Sunday, April 21, 2019, 5:23:33 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 Hank,that was great of River to help out!If it were me I would definitely machine it seeing you have to machinethe clamping area off on a pressed dome anyway. Way less work inevery way. BTW glass artists can ramp the temperature of their kiln down over2 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 ifyou machined.Just thinking there would be less waste around the perimeter on a machineddome 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 potteror 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" thickcast 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 atforming temperature. Anyway if you are forming a 5" block the pressureRequired is going to be used.When I had a 1" thick dome blown for me they had to stop & get thickerClamping 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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<20ID dome conical seat 3523fsw Rev1.1.PDF>

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