[PSUBS-MAILIST] cue ball arm

Fri Nov 28 19:16:50 EST 2014

Brian,
I am looking at brass because it is available and easy to machine.  The brass never touches the stainless because the ball sits on plastic seats(seals).  I agree about the plastic balls, it bothers me how brittle they are.  But we can't argue the track record.
Hank
--------------------------------------------
On Fri, 11/28/14, Brian Cox 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, 6:28 PM

 Hank,
          I like the idea of a
 bronze ball ( bronze not brass)  because is works with
 stainless very well.  Stainless to stainless will have
 a tendency to gall.  And I'm not sure of the properties
 of a cue ball.   You said you cracked one,
 that would bother me, metal is not going to crack. I'm
 planning to use one of my viewports as a possible place to
 mount a ball and socket arm.

 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] cue ball arm
 Date: Fri, 28 Nov 2014 15:04:45 -0800

 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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