[PSUBS-MAILIST] calculation

Tue Jul 7 22:22:49 EDT 2015

Scott, thanks for filling in the details.Hank, all the best with the dive test /diving.Wonder if Vance has experienced those loud noises from shifting view ports?Alan
      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Wednesday, July 8, 2015 10:59 AM
 Subject: Re: [PSUBS-MAILIST] calculation

Alan,
I am starting slip testing tomorrow, I just bonded the gasket to the test chamber.
As for testing the sub, I am using my barge with winch  to lower the sub with my video camera recording.  I will turn the radio on and talk to the sub from the surface.  I will tell the sub the depth constantly and it will be recorded.  
Hope to do this next week, it is a big effort, I have to truck the barge 6 hr to the lake, then drive home, then come the next day with the sub.  Maybe my wife will let me haul her car with the barge on the trailer so I can get home. :-)
Hank --------------------------------------------
On Tue, 7/7/15, swaters at waters-ks.com via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] calculation
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Tuesday, July 7, 2015, 6:01 PM

 Alan,When
 I was down diving with Karl Stanley earlier this year he
 showed me the veiwport that cracked. It was caused by him
 taking his sub to deep and the body warped putting side
 pressure on the veiwport. After that he derated his depth.
 This was on his first sub
 CBUG.Thanks,Scott Waters

 Sent from my U.S.
 Cellular® Smartphone

 -------- Original message
 --------
 From: Alan James via
 Personal_Submersibles
 <personal_submersibles at psubs.org> 
 Date:07/07/2015  4:27 PM  (GMT-06:00) 
 To: Personal Submersibles General Discussion
 <personal_submersibles at psubs.org> 
 Cc:

 Subject: Re: [PSUBS-MAILIST] calculation

 Hank,I remember
 Karl Stanley (or someone else) saying he cracked a dome at
 depthdue to an
 unexpected contraction of the pressure hull.Just in
 case everything is not right; how about an unmanned
 dive!You could
 record any noises by putting something like your cel phone
 in the hullon
 record.Then
 synchronize a watch on the support boat & record what
 depths you havethe sub
 down at at what times. So if you get a big "Crack"
 on your recording you will be
 able to tell at what depth it happened.Easier
 said than done I know, but probably worth it.Cheers
 Alan    
    From: hank pronk via
 Personal_Submersibles
 <personal_submersibles at psubs.org>

 To: Personal
 Submersibles General Discussion
 <personal_submersibles at psubs.org> 

 Sent:
 Wednesday, July 8, 2015 12:26 AM
  Subject: Re:
 [PSUBS-MAILIST] calculation

 Alan,
 When my
 dome made the mystery noise, I was at 100 feet deep. That
 puts about 18 tons on the dome.  I think it was either the
 straps were able to relax and find their happy place, or,
 the super cold water made the dome contract.
 Hank--------------------------------------------
 On Mon, 7/6/15, Alan James via
 Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

  Subject: Re:
 [PSUBS-MAILIST] calculation
  To:
 "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
  Received: Monday, July 6, 2015, 9:00 PM

  Hank,I was

 looking at some Deep Worker photos. The dome retaining
  bandslook like
  they can be
 wound tight from a central point at the

 top.I am
  wondering if they pre stress these
 significantly so that
  there is less
 movementwhen they
  are compressed at
 depth. 
  Also I
  commented
 on your retaining system when I first saw it, that
  I thought thevertical

 floatational force might move it upward, or the dome
 pivot
  out from the bottom.Perhaps
  you could exert more pressure on the dome with
 your clamping
  system?

 Alan

   From:
 Alec Smyth via
  Personal_Submersibles
  <personal_submersibles at psubs.org>

  To: Personal
  Submersibles General Discussion
  <personal_submersibles at psubs.org>

  Sent: Tuesday,
  July 7, 2015 12:31 PM

 Subject: Re:
  [PSUBS-MAILIST] calculation

  Does
 the
  window seat have some sort of inside
 diameter edge? I would
  think if it does
 not, then its pretty much guaranteed to

 slip with or without grease - with grease being the
 quieter
  less-terrifying option.
  Best,
  Alec

  On Mon,

 Jul 6, 2015 at 6:50 PM, hank pronk via
 Personal_Submersibles
  <personal_submersibles at psubs.org>
  wrote:

  Sean,

  Thank
 you for the input, I think I will just use weights
  like Alan says.

  I am making a fixture to simulate the EPDM
 gasket compressed
  under my dome.  I want
 to test it with grease and
  without.  I
 will squeeze the gasket in the fixture then

 push the top plate sideways with a pusher bolt to see if
 the
  gasket allows movement.  I want to
 make sure my dome can
  expand and contract
 at depth.

  Hank

 --------------------------------------------

  On Mon, 7/6/15, Sean T.
 Stevenson via Personal_Submersibles
  <personal_submersibles at psubs.org>
  wrote:

   Subject: Re:
 [PSUBS-MAILIST] calculation

   To: "Personal Submersibles General
 Discussion"
  <personal_submersibles at psubs.org>

   Received: Monday, July 6,
 2015, 9:08 AM

   Hank - the force developed
 is dependent on the

  stiffness of both the bolt material and of the specimen

   you're pushing on. 
 You can't necessarily
  equate

   this directly to torque
 because of friction in the bolt

   threads and at the bolt end contact, and of
 course the

   elasticity
 of the bolt itself. You can only estimate

 it. 

   There are many
 online tools for calculating the

 developed

   tensile force
 in a bolted connection, for example, but

 these

   consider only the
 bolt as the deformable element, and

   require an accurate estimate of coefficients
 of
  friction,

   and this will change with lubrication. As
 you complicate
  the

   system, it becomes more geometry
 dependent.

   A 1" -
 8 UNC 2A thread is 8 threads per

   inch, so a set number of turns will give you
 the
  approximate

   axial displacement (0.125" per
 revolution -
  approximate

   because the bolt will change length
 under load). If you

  assume a rigid fixture, then your strain is equal to
  the

  overall change in length (calculated from # of bolt
  turns),

  divided by the gauge length (distance over which the
  length

  change occurs, which would be the length of your
  specimen

  measured between the rigid fixture and the end of your
  jack

  bolt). Compressive or tensile load is then calculated
  based

   on
 the modulus of elasticity of the specimen. 

   Alternatively, you can
 measure the load (make the bolt
  or

   fixture into a load cell
 or strain gauge the specimen)
  and

   calculate the material
 properties.

   Load, axial
 displacement, modulus. You need any

   two to calculate the third.

   What are you making / testing?

   Sean

   On July
 6, 2015 6:26:49 AM

   MDT,
 hank pronk via Personal_Submersibles

   <personal_submersibles at psubs.org>
  wrote:

   Hi
 all,

   I

   need help, can anyone tell me how to
 calculate how much

  force a bolt can push or pull using a torque wrench to
  turn

   the
 bolt. So how many foot pounds of torque does it take
  to

   rotate
 a bolt to  create 250 lbs push with a 1 in

 coarse

   thread bolt.  I
 need to make a test fixture.

   Hank

   Personal_Submersibles
 mailing
  list

   Personal_Submersibles at psubs.org

   http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

   -----Inline Attachment Follows-----

  _______________________________________________

   Personal_Submersibles
 mailing
  list

   Personal_Submersibles at psubs.org

   http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

 _______________________________________________

  Personal_Submersibles
 mailing
  list

  Personal_Submersibles at psubs.org

  http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

 _______________________________________________
  Personal_Submersibles mailing list
  Personal_Submersibles at psubs.org
  http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

  -----Inline Attachment
 Follows-----

 _______________________________________________
  Personal_Submersibles mailing list
  Personal_Submersibles at psubs.org
  http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

 _______________________________________________
 Personal_Submersibles mailing list
 Personal_Submersibles at psubs.org
 http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

 -----Inline Attachment Follows-----

 _______________________________________________
 Personal_Submersibles mailing list
 Personal_Submersibles at psubs.org
 http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20150708/c0bd1ad8/attachment-0001.html>