[PSUBS-MAILIST] Manipulator

[Alan James via Personal_Submersibles]

Hi Scott,I was more advocating using hydraulic cylinders with a hydraulic system.However Phil had a pneumatically operated manipulator on a K stylesub 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 manipulatorto 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

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-------- 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 strengthwould match the load they can lift with 150 psi also.Is there any advantage other than the o ring working both ways to stop wateringress, as you have said previously. Does anyone else use them in placeof 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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