[PSUBS-MAILIST] cue ball arm
Hugh Fulton via Personal_Submersibles
personal_submersibles at psubs.org
Fri Nov 28 20:40:19 EST 2014
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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