Thanks Emile,
what sort of crush depth do you think you would have with the 27mm apex?
I noticed you weren't selling domes on your site. What are you doing
with all the domes you have been pressing?
I see you've been gaining the attention of the media with your turbine powered motorbike.
Regards Alan
From: Emile <emile@airesearch.nl>
To: personal_submersibles@psubs.org
Sent: Sunday, 17 June 2012 12:10 AM
Subject: RE: [PSUBS-MAILIST] how to fit the acrylic dome
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 27 mm .
We should calculate with the thinnest spot.
I also used a radius mill to reduce stress.
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?
From: Emile
<emile@airesearch.nl>
To: personal_submersibles@psubs.org
Sent: Saturday, 16 June 2012 9:07
AM
Subject: RE: [PSUBS-MAILIST] how
to fit the acrylic dome
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
Van:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] Namens André Eriksen
Verzonden: vrijdag 15 juni 2012
22:16
Aan:
personal_submersibles@psubs.org
Onderwerp: Re: [PSUBS-MAILIST] how
to fit the acrylic dome
From what you
said I made this sketch (attached). Is this a good way to fasten the dome?
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.
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?