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Alan The recess was needed to fit the dome in the ring. Is
not exactly round after thermoforming so machining is needed anyway. The bigger the base the better but the thickness on
the apex is only I also used a radius mill to reduce stress. Emile Hi
Emile, It looks like
you have a 28mm base to the dome & have eliminated 8mm with the 4mm angled
cut away for the O
ring & the additional recess for the retaining ring around the
perimeter. I thought the
base contained most of the stress & you would want to retain as much of it
as possible? Are you still
pressing domes? Regards Alan From: Emile
<emile@airesearch.nl> Not bad. But it is also
not done to machine a o-ring groove in the dome. Nemo’s first dome
cracked when the water o-ring froze! Attached my
solution. Green is o-ring Emile Van:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] Namens André Eriksen From what you
said I made this sketch (attached). Is this a good way to fasten the dome? -Andrè 2012/6/15
Emile <emile@airesearch.nl> Hi Andre, It is not done
to drill / tap any holes in a acrylic dome. Stressraiser! For shallow
divers you can glue . Under high
pressures the dome contracts more than the ring I use a o-ring
on the edge and stainless steel bands hold down the dome. Flange also possible
for shallow divers. In the handbook of acrylics are some examples. Emile Van: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]
Namens André Eriksen Hi, I`m new to
this forum, and are planning to build a 3 person sub. I can`t seem
to find any plans or pictures on how to fit the acrylic dome for the
hatch. Is it screwed down on flanges with an o-ring underneath, or liquid
gasket/glue? I`ve seen some domes without flanges, how do they attach them? thank you. -Andrè
Eriksen, Norway |