[PSUBS-MAILIST] Manipulator Hydrolic question

[hank pronk via Personal_Submersibles]

Alan, the volume difference would be the volume of the rods, typically 5/8 dia and maybe 6 in long max.  That is very little.  You could use a solid tank with a truck air bag. 
Hank --------------------------------------------
On Mon, 1/12/15, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Manipulator Hydrolic question
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Monday, January 12, 2015, 7:53 PM
 
 Is it that
 easy Hank,Wouldn't
 the oil in the reservoir change volume too
 much?You would
 have to allow for a worst case scenario of all the
 manipulatorcylinders
 being at full extension.Alan
     
    From: hank pronk via
 Personal_Submersibles
 <personal_submersibles at psubs.org>
 
 To: Personal
 Submersibles General Discussion
 <personal_submersibles at psubs.org> 
 
 Sent: Tuesday,
 January 13, 2015 1:29 PM
  Subject: Re:
 [PSUBS-MAILIST] Manipulator Hydrolic question
    
 
 Scott,
 If you
 can submerge the pump motor in the oil then you can have a
 square hyd reservoir with a rubber lid and your done, like
 the old school battery box.
 Hank--------------------------------------------
 On Mon, 1/12/15, hank pronk via
 Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:
 
  Subject: Re:
 [PSUBS-MAILIST] Manipulator Hydrolic question
  To: "Personal Submersibles General
 Discussion" <personal_submersibles at psubs.org>
  Received: Monday, January 12, 2015, 7:26 PM
  
  Scott, that is a GREAT
  idea, particularly in your deep sub.
  Hank
 
 --------------------------------------------
  On Mon, 1/12/15, via Personal_Submersibles
  <personal_submersibles at psubs.org>
  wrote:
  
  
 Subject: Re:
  [PSUBS-MAILIST] Manipulator
 Hydrolic question
   To: "Personal
 Submersibles General
  Discussion"
 <personal_submersibles at psubs.org>
   Received: Monday, January 12, 2015, 7:13
 PM
   
   Hank,
    
   My thought was to have
 no
  hydraulic penetrators
   into the sub and to
  only
 have a subconn to run
  
 
 the manipulator. The pumps would be submerged in the
   hydraulic reservoir outside of the sub
 and
  would be pressure
  
 compensated.  Good or
  bad idea?
    
   Thanks,
   Scott Waters  
    
   
   -------- Original
   Message --------
   Subject:
 Re:
  [PSUBS-MAILIST] Manipulator Hydrolic
 question
   From: hank pronk via
 Personal_Submersibles
   <personal_submersibles at psubs.org>
   Date: Mon, January 12, 2015 4:46 pm
   To: Personal Submersibles General
  Discussion
   <personal_submersibles at psubs.org>
   
   Scott,
   The
  pump runs the whole
 time the arm is in use. When you
   want to
 grab the gold filled chest, turn on
  the
 pump and use
   the arm then turn it off
  when your done. I would keep it
   simple,
  besides the arm
 functions are continuous. It
   probably
 takes less power to keep the pump
  running
 rather
   than start and stop
  constantly. You could use multiple small
  
  pumps that activate with
 each function, might be simpler
  in
   the end. No valve bank and less
  complicated.
   Hank
  
 
 --------------------------------------------
   On Mon, 1/12/15, via
 Personal_Submersibles
  <personal_submersibles at psubs.org>
   wrote:
   
 
 
  Subject: [PSUBS-MAILIST] Manipulator
 Hydrolic question
   To: "psubs"
 <personal_submersibles at psubs.org>
   Received: Monday, January 12, 2015, 5:54
 PM
   
   Do
   most
  submarine manipulator
 arms have a pump for each
   cylinder
 controlled electronically from the
  inside
 of the
   sub or do they have one pump
  that is continuously running
   and hoses go
  in the sub and
 controlled with valves? Or
  
  perhaps another way? 
    
  
  My excavators in my company
 have one pump that is
   engine driven and
 it runs continuously an the
  cylinders
 are
   actuated by valves. Seems
  impractical to me to have a
  
 battery driven
  pump that runs continuously.
 
    
   Thanks,
   Scott Waters
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