[PSUBS-MAILIST] Manipulators

Fri Jan 24 16:50:42 EST 2014

I can't answer, as I have precisely zero experience with pneumo manips. Nuytco did in fact cook one up for the Sea Urchin, which seemed to work okay, but I don't know anything about it. Sorry. That said, if it's cheap and it works (even if it's a pain in the ass) then it's worth having. Subs should be able to DO something, not just cruise around like an oversized camera housing with motors. I'd give serious consideration to the ball and socket arm, which functions adequately down to about 600 feet (according to the boys who have used them). We figure one would cost about $500-600 USD to machine, plus material and welding. A thousand bucks or a little more isn't bad, considering there are exactly three moving parts in the whole thing (as opposed to a hydraulic system which has about 3 moving parts to the running inch).
Vance

-----Original Message-----
From: Alan <alanlindsayjames at yahoo.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Fri, Jan 24, 2014 3:12 pm
Subject: Re: [PSUBS-MAILIST] Manipulators

One more question Vance & I'll leave you in peace
for a week.
For a small non commercial submersible operating to 500 ft
that has a very limited use for a manipulator other than it being there 
just in case we come across some item of value. Is a pneumatic manipulator a good
option? Air is already there & wouldn't be consumed much because
of the limited use. No noise & expensive space consuming hydraulic system.
And as you say there are options for lifting heavier items.
Thanks,
Alan

Sent from my iPad

On 25/01/2014, at 8:01 am, Joe Perkel <josephperkel at yahoo.com> wrote:

I particularly liked the PVC tube with the furled lift bag and air source, now that's got real "get work done" utility.

It seems to me that a permanently mounted air source terminating just aft of the claw is a natural companion set-up for anyone with a manipulator on a PSUB. 

Joe

Sent from Yahoo Mail for iPad

                                                            From:                                                        Alan James <alanlindsayjames at yahoo.com>;                            
                                                            To:                                                        Personal Submersibles General Discussion <personal_submersibles at psubs.org>;                                                                                                     
                                                            Subject:                                                        Re: [PSUBS-MAILIST] Manipulators                            
                                                            Sent:                                                        Fri, Jan 24, 2014 6:09:42 PM                            

Thanks Vance,
that's shed some light on the subject.
Alan

   From: Vance Bradley <Vbra676539 at AOL.com>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Saturday, January 25, 2014 5:42 AM
 Subject: Re: [PSUBS-MAILIST] Manipulators

Alan,
I've seen the discussion. The smallest sub I know of with a manipulator on board is the Deepworker. No exfra tanks there. Metacentric vs CG works in all directions. Yes, you get movement and no it's not a problem in my experience. I did operate the bigger subs but also smaller ones, to include Aquarius, briefly in a DW, plus three different K-boats, so speak with some experience. You put everything you imagine on a small sub, you get a big sub. In any case, It's probably best to think of a psub as a work in progress. Get the boat done, go play, scratch head, get more work done, go play, scratch head......and so it goes.
Vance

Sent from my iPhone

On Jan 24, 2014, at 3:20 AM, Alan James <alanlindsayjames at yahoo.com> wrote:

Vance,
a couple of people have mentioned lately the problem of the shifting of
balance as you reach out with a manipulator & have talked about countering it with
trim tanks. Is it a big deal if you go nose down, tail up? Possibly more of a problem working on a 
vertical face than picking something up off the bottom. 
Some of our subs will be a lot smaller than the working subs you were in so the problem would be 
accentuated in our case.
Can you give us some of your experience on this thanks & in your opinion is it worth messing
about with the trim while operating the manipulator.
Alan

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