[PSUBS-MAILIST] Clearances

[Rick Patton via Personal_Submersibles]

Hi Jon
The viewport is 15" OD and the machined receiver is 14 3/4" heavy.
I had machined a groove in all my viewport receivers for a rubber O ring
but then heard that it created a point loading situation so I then filled
the groove with weld metal so then planned to use a Sikaflex like a lot of
the guys had.

Rick

On Tue, Dec 10, 2024 at 3:12 AM Jon Wallace via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Rick,
>
> Hopefully Alec Smyth will see your post and comment.  Also, Dave Colombo
> just went through using caulking to re-mount his K-250 dome in the field at
> Block Island and can be another good resource.
>
> How round is your viewport thru-hull?  If it's close to perfect why not
> reduce the viewport diameter just enough to get a tight clearance and stick
> with a gasket seal?
>
> If you decide to use sikaflex, a loose clearance (1/8 to 3/16) should work
> I suspect.  You don't want too large of a gap because geometrically it will
> negatively affect the required seat width for the acrylic.
>
> Jon
>
>
>
> On Monday, December 9, 2024 at 08:24:23 PM EST, Rick Patton via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
>
> Sent from my iPhone
> I got a real surprise yesterday, I went to fit my large viewport in front
> on my K-350 and it wouldn’t slide inside the receiver that I had machined
> for it. They made it about 1/4” too small!
> I should have double checked it before welding it into the front head but
> didn’t.
> I had the viewports cut in California and is to speck, 15”.  Kitteredge
> called out using gasket but a lot of you I believe used Silaflex that comes
> out of a tube.
> I found someone who can chuck up something that is 16” in diameter so will
> have him turn it down 1/4” or so, so it will fit in the receptacle but I
> need enough of a gap on the edges for the Sikaflex to ooze out.
> Your thoughts?
> Rick
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