[PSUBS-MAILIST] Jon's new penetrators

Tue Feb 9 17:33:47 EST 2016

Alan,I am suggesting the o-rings would be on the shaft, no pre-loading required.  Hank 

    On Tuesday, February 9, 2016 2:48 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,Just thinking of how Jon would compress the o-rings.With the snap ring you could use washers to pack itout to get a bit of compression, if you can find the right size washers & if you made the grove slightly wider than thethrough hull depth. Then you would have to grip & pull the delrinor push it from the outside.Found this article on glueing it & the key is to key it. There are gluesavailable but they only have a 10-20% strength & we need apotting compound that will adhere.http://www.polytechforum.com/cnc/what-epoxy-do-you-use-to-join-delrin-parts-16642-.htm
Alan"Nothing is easy with submarines"

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Wednesday, February 10, 2016 10:13 AM
 Subject: Re: [PSUBS-MAILIST] Jon's new penetrators

Alan,I was thinking snap ring to keep it simple and they are quite reliable, but I am  easy.  Hank 

    On Tuesday, February 9, 2016 1:48 PM, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,if you had a snap ring to retain it, if there were anyslop or the positioning was slightly out it could fail.Would it be better to put an external thread on the delrin(by hand) on the portion that protrudes in to the hull& tighten it up with a nut.Alan

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Wednesday, February 10, 2016 5:42 AM
 Subject: Re: [PSUBS-MAILIST] Jon's new penetrators

Jon,I will have to research drilling size for 1\4 inch, but yes, I will drill under size then run a tap through to make the threads.  To keep it simple, I would like to do two o-rings on the bore with an over size end to create a shoulder and then a snap ring to retain it.  You would get the penetrator with a hole or holes bored through and three grooves, two for o-rings and one for the snap ring.  All you will have to do is cut the rod to length and thread it in with some epoxy on the threads.  Hank 

    On Tuesday, February 9, 2016 8:52 AM, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hank,    so to clarify on the Delrin, a copper threaded rod ( 1/4" for instance) would get threaded into the Delrin?  Would you just make an undersized hole then?  and the copper rod would form a thread all the way through? Brian

--- personal_submersibles at psubs.org wrote:

From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Jon's new penetrators
Date: Tue, 9 Feb 2016 00:03:53 +0000 (UTC)

Jon,Great, if you can give me the measurements I can whip them up for you and you can thread the rods in.  Also let me know the grade of Derlin and I will see if I can get it here.Hank 

    On Monday, February 8, 2016 4:31 PM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Don't have calipers but will get a good one soon so I can get some measurements.

 Jon

 On 2/7/2016 10:27 PM, hank pronk via Personal_Submersibles wrote:

  Jon, I just realized that your penetrator holes are in the aft head, so my last idea is bad!  Derlin is the way to go.  Do you have a caliber to get some accurate measurements?  
  Hank  

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