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RE: <SPAM> RE: [PSUBS-MAILIST] acrylic viewport thickness



Think about what you just wrote.... you're saying that is easier to cut several pentagobal sections, make sure they have the same circularity within certain deviation, make sure they are the exact same measurements, then glue each of the 5 sides on each section and make sure it's in place correctly ....
 
Is this really easier than two hemispherical sections??? I disagree with you, but you are entitled to your opinion....
 
Hugo
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What about the sub that was made by bonding curved pentagonal sections of acrylic together? Wouldn't it be more economical to make a few dozen smaller identical sections that assemble into a sphere or dome? If you mess something up, you're out one fairly small piece instead of an entire unit.
 
Also, wouldn't vacuum-forming over a mold be more consistent? A good mold of fired ceramic or perhaps carbon fiber could be made with the desired curve and a few small vent holes drilled into it. Set a square of acrylic into a box, set the mold over the acrylic and seal it to the box. Heat the acrylic and when everything reaches the desired temp, apply vacuum above the mold to pull the acrylic to shape.
 
Then set the curved sheet of acrylic onto a second mold with an identical curve, but with the sides cut to a pentagonal shape. Cut the acrylic to match that mold, then anneal it.
 
Repeat.
 
What epoxy will bond acrylic together though, and is there a special bonding method required?

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