[PSUBS-MAILIST] cue ball arm
Hugh Fulton via Personal_Submersibles
personal_submersibles at psubs.org
Fri Nov 28 23:02:38 EST 2014
Hank,
1/2" Tube / rod at 200 ft (approx 100 psi)will require about 20 lbs force to
push out and 5/8" rod will take about 30 lbs. Keep it in mind.
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 2:50 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] cue ball arm
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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