[PSUBS-MAILIST] information on viewports

[Alan James via Personal_Submersibles]

Hi Jeff, welcome along. Keep the questions coming and if you dont get a satisfactory reply try again. This is a helpful and experienced group. I have never heard of any home builder casting their own acrylic domes or view ports. It could be happening with the improvements in technology and products available.You would need to build an inner & outer mold & let it set very slowly for the thickness involved. When they pioneered acrylic dome casting they had a sprue at the apex of the dome for sucking material from during its shinkage while setting. And a lot of failures.It also involves post molding machining & clean up. Also you will need a large enough computer controlled oven to ramp up & down the temperature at around 1 degree per hour.Most people that attempt a home made dome will have it blown. But again you need to control the temperature increase.Regards Alan.
 
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