[PSUBS-MAILIST] K-sub hatch o-ring

[James Frankland via Personal_Submersibles]

Hi Jon

I measured the inside diameter of the hatch O ring groove.

I measured it at 588mm or 23.14"

Its difficult to measure super accurately due to the paint thickness but I
know It was made it exactly to the plans, including the bevel.  I had an
engineering company skim it and put the groove in as I couldnt fit it on my
machine.

The O ring I am using is 0.25" 60D one that I made out of cord.  I went for
60D as opposed to 70 on advice as its easier to crank the hatch down
tight.  I experimented with different cords of very slightly different
thicknesses and then just went for the one I felt was right.  I glued it
together with "special" glue that the company I got the cord from sold me.
Later I discovered that its just superglue if you check the ingredients.

I always take the hatch O ring off after diving to make sure I dont get
corrosion in the groove.

Its the only one ive ever used on the sub and its never leaked, not even a
bit.

Not sure thats much help, but my 1p's worth.

Regards
James



On Thu, 10 Jun 2021 at 22:41, James Frankland <jamesf at guernseysubmarine.com>
wrote:

> I will measure and check on sat.   I made my own o ring from cord but I
> did it all to the plans as I can remember.  I was very careful to follow
> the instructions properly.
> Will get back to you with measurements.
> Regards
> James
>
> On Thursday, 10 June 2021, Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> James, if you can measure it please do.  I've only got the numbers that I
>> calculated from drawings.  Also interested in size of the o-ring,
>> diameter/thickness.  Did you purchase one or did you make your own?
>>
>> Jon
>>
>>
>>
>> On Thursday, June 10, 2021, 09:54:54 AM EDT, James Frankland via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> Hi Jon,
>>
>> Do you have the info you need on the K-350 hatch dimentions?   I can
>> measure mine this weekend if required, i just missed the email threads on
>> this one, but happy to assist with any requests if need be.
>>
>> Regards
>> James
>>
>>
>>
>> On Thu, 10 Jun 2021 at 01:53, Rick Patton via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> Jon
>> I’ll be home in a couple of hours and I’ll let you know.
>>
>> Rick
>>
>> Sent from my iPhone
>>
>> On Jun 9, 2021, at 9:21 AM, Jon Wallace via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> 
>> Can someone with a K-350 measure the ID of the hatch o-ring channel and
>> report back on it?  The K350 plans specify a 2-471 O-ring which has an ID
>> of 21.995 inches but I'm measuring an ID of 23.25 on the K600 and I'm
>> thinking the K350 also has an ID of 23.25.  That would seem like a bit of a
>> "stretch" installing the 2-471.
>>
>> There's a 2-472 O-ring that has an ID of 22.995 inches which would
>> require less stretching, but...???
>>
>> Will post on FB as well.
>>
>> Jon
>>
>>
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