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

Tue Jun 15 08:02:16 EDT 2021

 Thank you for the info James.  I got my #472 o-ring which is .275 cross-section and it seems way too fat for the channel.
Jon

    On Saturday, June 12, 2021, 01:20:37 PM EDT, James Frankland via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 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.
RegardsJames

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.RegardsJames

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.
RegardsJames

On Thu, 10 Jun 2021 at 01:53, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

JonI’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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