[PSUBS-MAILIST] cue ball arm

[hank pronk via Personal_Submersibles]

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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