Re: [PSUBS-MAILIST] how to fit the acrylic dome

Subject: Re: [PSUBS-MAILIST] how to fit the acrylic dome

From: André Eriksen <a.erikse@gmail.com>

Date: Sat, 16 Jun 2012 09:53:22 +0200

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Thank you!

Makes abit more sense now. Looks like I will go with a dome without flanges and O-ring on the edge. And a steel band to hold it down.

Emile: Do you sell a full assembly?

-Andrè

2012/6/15 Alan James <alanjames@xtra.co.nz>

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>
To: personal_submersibles@psubs.org
Sent: Saturday, 16 June 2012 9:07 AM
Subject: RE: [PSUBS-MAILIST] how to fit the acrylic dome

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
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?

-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
Verzonden: vrijdag 15 juni 2012 17:25
Aan: personal_submersibles@psubs.org
Onderwerp: [PSUBS-MAILIST] how to fit the acrylic dome

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