[PSUBS-MAILIST] Manipulators

[hank pronk]

Dan,
My valve is a 6 bank double acting 24v solenoid valve.  The valve started it's life as a standard valve, then the solenoids were encased in a bolt on box then oil filled and pressure compensated with a bladder(hose)  I also made a hose cutter so I can jettison the arm.   I once built an arm that ran off convertible top hyd pumps.  You can use one pump per function and it is a pump/valve all in one.  They cost about 150 bucks on ebay and come with the cylinders.  That is the way to go in my opinion.  you buy four pumps and your done, the pumps just run in reverse for opposite oil flow,,,very simple.  Oh ya I tested one and it gave me 1,200psi
Hank



On Friday, January 24, 2014 3:15:56 PM, Dan H. <jumachine at comcast.net> wrote:
  
To all. 
A few years back I was working on 
a manipulator design but shelved it for lack of a suitable small multi 
function hydraulic valve.  I was looking for a small manually operated 
valve.  I was going to use air cylinders for their compact design and 
reasonable pressure, plastic hoses rated to around 800 PSI and a multi section 
manual operated control valve.  I didn't want to design a build a valve 
too.  Has any one found something I missed?  Maybe a gallon or less / 
minute flow at maybe 300 to 600 PSI is what I was thinking about.  
  
Hank, The arm you have is a beautiful design.  
What are you using for control valves? 
  
Thanks, Dan H. 
----- Original Message -----  
>From: Vance Bradley  
>To: Personal Submersibles General  Discussion  
>Sent: Friday, January 24, 2014 11:42  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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