[PSUBS-MAILIST] Manipulator

Wed Feb 11 16:33:28 EST 2015

I think Alan may be right about the bounciness, but the real charm for that system is that you can run it with 3-way valves and not have the added charms of a hydraulic system. That was the idea with the Nuytco sub. Simplicity and low cost.
Vance

-----Original Message-----
From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Wed, Feb 11, 2015 4:11 pm
Subject: Re: [PSUBS-MAILIST] Manipulator

Hi Scott,
I was more advocating using hydraulic cylinders with a hydraulic system.
However Phil had a pneumatically operated manipulator on a K style
sub he manufactured. Mainly I think for simplicity & cost.
For commercial use maybe the pneumatics would be limited; but there 
would be plenty of air if you just wanted to pick up a gold bar if you 
happened upon one.
A divers regulator gives you 130psi above ambient so compensating is not a 
problem. Perhaps some overpressure valves for expansion on ascent.
I would think the pneumatics would be OK moving your manipulator
to the target, but bouncy once you picked up a load & were moving it.
Vance would know.
Alan

   From: "swaters at waters-ks.com via Personal_Submersibles" <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Thursday, February 12, 2015 8:17 AM
 Subject: Re: [PSUBS-MAILIST] Manipulator

Alan, 
I looked into air, but it presents some problems. One is compensating it otherwise you will get less preformance based on depth. Two is they are not as stiff and have give as well as less fine control. Also another problem is if you used compressed air, you have a limiting factor or you could use a compressor, but have to have a bank to draw from.
The main draw back of hydraulic for me was the mess and polution factor. Otherwise, hydraulic seems to be the way to go.
I am hoping to come up with a manipulator design that can be used on most psubs that is easy and affordable.
Thanks,
Scott Waters

Sent from my U.S. Cellular® Smartphone

-------- Original message --------
From: Alan James via Personal_Submersibles <personal_submersibles at psubs.org> 
Date:02/11/2015  12:52 PM  (GMT-06:00) 
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Cc:  
Subject: Re: [PSUBS-MAILIST] Manipulator 

Hank,
why not just use air if the pneumatic cylinders are rated for 150 psi.
If they are rated for 150 psi it would be assumed that their mechanical strength
would match the load they can lift with 150 psi also.
Is there any advantage other than the o ring working both ways to stop water
ingress, as you have said previously. Does anyone else use them in place
of hydraulic cylinders?
Alan

   From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Thursday, February 12, 2015 7:21 AM
 Subject: Re: [PSUBS-MAILIST] Manipulator

No problems, Gamma has air cylinders and at 1,000 feet the hydraulic pump is set at 1,100 psi.  Your K sub can have a pressure setting of 500 or less and work just fine. Remember, your not lifting a lot just the arm plus a bit.
Hank--------------------------------------------
On Wed, 2/11/15, swaters at waters-ks.com via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Manipulator
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Wednesday, February 11, 2015, 12:23 PM

 Do you
 have any problem with over pressure though? The pnuematic
 cylinders are rated to 150psi with air and 1000 psi with
 oil. Thanks,Scott
 Waters

 Sent from my U.S.
 Cellular® Smartphone

 -------- Original message
 --------
 From: hank pronk via
 Personal_Submersibles
 <personal_submersibles at psubs.org> 
 Date:02/11/2015  11:12 AM  (GMT-06:00) 
 To: personal_submersibles
 <personal_submersibles at psubs.org> 
 Cc:

 Subject: Re: [PSUBS-MAILIST] Manipulator

 hi Scott
 use a
 hydraulic pump just the same as if you used hydraulic
 cylinders
 Hank           

                                 From:

                             swaters at waters-ks.com via
 Personal_Submersibles
 <personal_submersibles at psubs.org>;                    

                                 To:

                             psubs
 <personal_submersibles at psubs.org>;                    

                                 Subject:

                             [PSUBS-MAILIST] Manipulator     

                                 Sent:

                             Wed, Feb 11, 2015 3:39:07 PM    

                             Hank,I know you
 said to use pnumatic cylinders  for the manipulator arm.
 What kind of pump do you
 use?Thanks,Scott Waters

 Sent from my U.S.
 Cellular®
 Smartphone

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