[PSUBS-MAILIST] cue ball arm

[Stephen Fordyce via Personal_Submersibles]

Excellent:)
On 30/11/2014 8:55 AM, "hank pronk via Personal_Submersibles" <
personal_submersibles at psubs.org> wrote:

>
> Steve,
> That is a brilliant idea!  I think it would be pretty simple really, just
> undersize the cylinder a bit so there is always weight on the arm to keep
> the cable tight.  The water pressure is free for the taking, I like it!
> Hank--------------------------------------------
> On Sat, 11/29/14, Stephen Fordyce 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: Saturday, November 29, 2014, 4:36 PM
>
>  Hi Hank,
>
>  Instead of an air cylinder with pneumatic supply, what about
>  a small hydraulic cylinder powered by the pressure outside?
>  If you match the cross sectional area of the rod through cue
>  ball and the hydraulic cylinder (I guess it would be the top
>  end, so have to subtract hydraulic rod area from piston
>  area) it should be more or less self compensating at any
>  depth.
>  Fair amount of messing around to do it with
>  maybe an oil bladder outside, through-hull, etc., but saves
>  you having to deal with increased cabin pressure due to
>  release of spent air from the pneumatic system, especially
>  if you're adjusting a lot.
>  Cheers,
>
>  Steve
>  On 30/11/2014 5:52 AM,
>  "hank pronk via Personal_Submersibles" <personal_submersibles at psubs.org>
>  wrote:
>  Alan,
>
>  Have a look at my cue ball arm assembly at Gamma
>  restoration.  I repaired the original seat for the cue
>  ball.  After Hugh said to forget about making a curved
>  seat, I realized I could make my own seat on a 45 degree
>  angle.  I made the second half of the assembly with a home
>  made plastic seat machined from ABS.  I installed it in
>  Gamma and it turns smooth as glass and has the original
>  amount of range.  With home made plastic seats, it is a
>  breeze to make this because the o-ring still does the
>  sealing.
>
>  Now I just need the plans and my new cue ball to finish the
>  arm.
>
>  Vance,
>
>  I was thinking about mounting an air cylinder horizontal
>  inside the sub to pull on the block and tackle cable.  The
>  deeper I go the more air pressure I add, it will be like an
>  adjustable spring.
>
>  Hank
>
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