[PSUBS-MAILIST] cue ball arm

Fri Nov 28 20:50:27 EST 2014

Hugh,
I have machined the ball to accept a 5/8 rod for testing purposes only.  I am waiting for the plans to arrive before I go further.  I just recently saw that video and was amazed at how well it worked.
Hank--------------------------------------------
On Fri, 11/28/14, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] cue ball arm
 To: "'Personal Submersibles General Discussion'" <personal_submersibles at psubs.org>
 Received: Friday, November 28, 2014, 8:40 PM

 Hank,
 I
 am qualified enough to ask what works the best. Still want
 to hear from
 Lance. 
 There
 is a lot of art as well as science in the building of these
 things. 
 Generally these things have all
 been visited before by someone.  Once we
 understand all the issues then we can look at
 improving it or not.
 As I said this is a
 fascinating project.  I saw the video and the ease that
 the operator was picking up objects on the move
 some time ago and it was
 simple and
 effective.  Anyway What is the diameter of the internal rod
 and
 the OD of the tube you are using? I am
 thinking of a way of pressure
 compensating
 it. Chs, Hugh

 -----Original
 Message-----
 From: Personal_Submersibles
 [mailto:personal_submersibles-bounces at psubs.org]
 On Behalf Of hank pronk via
 Personal_Submersibles
 Sent: Saturday, 29
 November 2014 12:05 p.m.
 To: Personal
 Submersibles General Discussion
 Subject: Re:
 [PSUBS-MAILIST] cue ball arm

 Hugh,
 You are
 likely the most qualified and equipped to figure this out. 
 I must
 say, I am getting good results from
 my setup.
 Hank--------------------------------------------
 On Fri, 11/28/14, Hugh Fulton via
 Personal_Submersibles
 <personal_submersibles at psubs.org>
 wrote:

  Subject: Re:
 [PSUBS-MAILIST] cue ball arm
  To:
 "'Personal Submersibles General
 Discussion'"
 <personal_submersibles at psubs.org>
  Received: Friday, November 28, 2014, 4:03
 PM

  Hank,

 OK
  I never realised that.  Very
 intesting.  The cue ball
  (plastic) on a
  curved SS seat. Reversed SS

 Ball on plastic seat. 
  No doubt there is
 a
  reason behind it all where we need a bit
 of history.
  Vance, are you listening? 
 They will have  tried a ball valve design at
 some  stage most  probably  and found that
 the lowest friction  is from the
 design
 they came up with.  We  usually have a torque of about 5
 ft lbs but
 again it is for 6000 psi 
 service.  I need  to have a play with this as it
 is quite fascinating.  Chs,  Hugh

  -----Original
  Message-----
  From: Personal_Submersibles

 [mailto:personal_submersibles-bounces at psubs.org]
  On Behalf Of hank pronk via

 Personal_Submersibles
  Sent: Saturday, 29
  November 2014 9:42 a.m.
  To:
 Personal
  Submersibles General Discussion
  Subject: Re:
  [PSUBS-MAILIST]
 cue ball arm

  Hugh,
  Now that
  is interesting!  Just so you know, the
 original cue ball  sits on a  ss
 shaped
 seat that matches the  ball perfectly.  The seal is a
 regular 1/8  in
 dia o-ring mounted at the
 equator of the cue  ball.

 Hank--------------------------------------------
  On Fri, 11/28/14, Hugh Fulton via
  Personal_Submersibles
  <personal_submersibles at psubs.org>
  wrote:

 Subject: Re:
  [PSUBS-MAILIST] cue ball
 arm
   To:

 "'Personal Submersibles General

 Discussion'"
  <personal_submersibles at psubs.org>
   Received: Friday, November 28, 2014, 3:27 
 PM

   Hank, A metal
 ball
  is
   fine.  Brass is
 likely to corrode
  faster than 316 SS  if
 it is not looked  after. The harder the  better of
 course but if  it is kept  greased  then
 you  won't  have a problem.  Forget
 the seal having  to be curved  for the
 ball.  We use 45  degree seats at
  6000
 psi.  There is less torque  required on a 45  degree seat
 than a
 fully  shaped one and the  sealing
 is  better.  We  allow  about 3 to
  4
 thou of crush from finger tight to  fully  torqued 
 bolts.
  Because you are only  doing low
  pressure you can get more  angle  with the 
 seat contact to give you a
 greater movement.
 As  I  said before  the secret  is in the  grease
 for 
 ease.  Do you have an oxygen
 grease?  White  stuff.  Will reduce the
 friction by 60%.  Regards,  Hugh     

   -----Original Message-----
   From: Personal_Submersibles

 [mailto:personal_submersibles-bounces at psubs.org]
   On Behalf Of hank pronk via

  Personal_Submersibles

 Sent: Saturday, 29
   November 2014 8:59
 a.m.
   To:
  Personal
   Submersibles General Discussion
   Subject: Re:

 [PSUBS-MAILIST]
  cue ball arm

   Hi
 Hugh,
   I

  don't have the original drawings yet, but
 Vance has  them  and is sending
 them to
 me.
   I
   am going to
 experiment with
  a brass ball to replace the
 cue  ball.  With  the modified ball valve I
 can  use a metal  ball now.  Any thoughts on
 that.

 Hank--------------------------------------------
   On Fri, 11/28/14, Hugh Fulton via
   Personal_Submersibles

 <personal_submersibles at psubs.org>
   wrote:

  Subject: Re:

 [PSUBS-MAILIST] cue ball
  arm
    To:

 "'Personal Submersibles General

  Discussion'"

 <personal_submersibles at psubs.org>
    Received: Friday, November 28, 2014, 2:46 
 PM

    Hi Hank,
    Do you or anyone else, have a cross
  section  of  the cue-ball, glands, and
  arm  mechanism  anywhere?

  I would like to have

 a look at the
    seal side as well.  We
 make
   ball valves  and  have done a lot
 of work  on  different designs of seals.

   Might
 be able to come up with one that is  easier to  move.  We
 use an
 oxygen  grease  which is  magic
 for reducing friction. Goes under  the name
 of  "slippery pooze"
  here in the  workshop.

 Regards, Hugh.

    -----Original

  Message-----
    From:

 Personal_Submersibles
   [mailto:personal_submersibles-bounces at psubs.org]
    On Behalf Of hank pronk via

 Personal_Submersibles

 Sent: Saturday, 29
    November 2014 5:42
  a.m.
    To:
   personal_submersibles at psubs.org
    Subject: [PSUBS-MAILIST] cue ball arm

    Hi Alan,

   I

 just
  added a picture of the cue ball arm, 
 ball assembly,  installed on  Gamma. 
 You  can see the  range  of motion and how
 it mounts to the  sub.
    Hank

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