<p dir="ltr">Excellent:)</p>
<div class="gmail_quote">On 30/11/2014 8:55 AM, "hank pronk via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Steve,<br>
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!<br>
Hank--------------------------------------------<br>
On Sat, 11/29/14, Stephen Fordyce via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br>
<br>
Subject: Re: [PSUBS-MAILIST] cue ball arm<br>
To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Received: Saturday, November 29, 2014, 4:36 PM<br>
<br>
Hi Hank,<br>
<br>
Instead of an air cylinder with pneumatic supply, what about<br>
a small hydraulic cylinder powered by the pressure outside?<br>
If you match the cross sectional area of the rod through cue<br>
ball and the hydraulic cylinder (I guess it would be the top<br>
end, so have to subtract hydraulic rod area from piston<br>
area) it should be more or less self compensating at any<br>
depth.<br>
Fair amount of messing around to do it with<br>
maybe an oil bladder outside, through-hull, etc., but saves<br>
you having to deal with increased cabin pressure due to<br>
release of spent air from the pneumatic system, especially<br>
if you're adjusting a lot.<br>
Cheers,<br>
<br>
Steve<br>
On 30/11/2014 5:52 AM,<br>
"hank pronk via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
wrote:<br>
Alan,<br>
<br>
Have a look at my cue ball arm assembly at Gamma<br>
restoration. I repaired the original seat for the cue<br>
ball. After Hugh said to forget about making a curved<br>
seat, I realized I could make my own seat on a 45 degree<br>
angle. I made the second half of the assembly with a home<br>
made plastic seat machined from ABS. I installed it in<br>
Gamma and it turns smooth as glass and has the original<br>
amount of range. With home made plastic seats, it is a<br>
breeze to make this because the o-ring still does the<br>
sealing.<br>
<br>
Now I just need the plans and my new cue ball to finish the<br>
arm.<br>
<br>
Vance,<br>
<br>
I was thinking about mounting an air cylinder horizontal<br>
inside the sub to pull on the block and tackle cable. The<br>
deeper I go the more air pressure I add, it will be like an<br>
adjustable spring.<br>
<br>
Hank<br>
<br>
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