[PSUBS-MAILIST] cue ball arm

Fri Nov 28 18:28:21 EST 2014

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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