[PSUBS-MAILIST] Manipulator arm

Thu May 29 17:24:45 EDT 2014

Hi Hugh,
The convertible top pumps are about the same size as a wind shield wiper motor.  They are quite small actually.  I would say the motor is about 2.5in dia and 6in tall.  They develop 1,000 psi, at least the one I tested did.  I have only used GM pumps, but I am sure they are all the same more less. Also I have had good success with a common snow plow hyd pump.  You will need a hyd valve bank if you use the snow plow pump.  The beauty of a top pump is that you do not need a valve bank. Gamma has an aircraft pump that according to the maintenance records works best at 1,100 psi when at max depth of 1,000 feet.
That means you only need about 650psi above bottom for the arm to work.  I have the pressure set at 500 psi for shop testing and it seems good already at that pressure.  

Hank
--------------------------------------------
On Thu, 5/29/14, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Manipulator arm 
 To: "'Personal Submersibles General Discussion'" <personal_submersibles at psubs.org>
 Received: Thursday, May 29, 2014, 4:36 PM

 Hank,
 That seems like very good advice.  I am wanting to do a
 manipulator but need
 to get some idea of what lifting or forces are required.
 What are the pumps you have found to work best.  What
 pressure do they
 develop? I had no idea what a top pump was so googled it and
 came up with
 breast pumps!! I didn't want to make a tit of myself so
 chased down some
 more and found that they are for convertible cars. They look
 a bit on the
 large side diameter wise.  Any brand best? 
 Cheers,  Hugh 

 -----Original Message-----
 From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
 On Behalf Of hank pronk via Personal_Submersibles
 Sent: Friday, 30 May 2014 12:21 a.m.
 To: Personal Submersibles General Discussion
 Subject: Re: [PSUBS-MAILIST] Manipulator arm

 Scott,
 No matter how you do it, a manipulator will cost some of
 money.  I have made
 many and the tendency seems to be, to try and make them
 strong to lift a
 lot.  Well first off, I think it was Vance that said it
 best.  A manipulator
 is for manipulating not lifting.  With that in mind,
 large components are
 not needed.  Simple air cylinders from ebay are 
 all that is needed.  A 2in
 bore and depending on manip design, 4in stroke, maybe as
 much as 6in stroke
 is all you need.  Keep the rod size small at 5/8, that
 reduces the back
 pressure.  I have said it before, I love convertible
 top pumps.  Consider
 using one pump per function again purchase from ebay for 125
 bucks.  No need
 for valves, the pump simply runs in reverse to change
 direction of the
 piston. Keep the pumps inside the sub and it is real
 simple.  As for the arm
 itself, if have made them from cardboard first.  You
 can mock it up that way
 and find the best pin locations for the cylinders and ensure
 the  cylinders
 stroke properly without over centering. You can build the
 arm with square
 tubing, use 3 inch aluminum so the cylinders fit inside when
 the arm is
 folded up.  Forget about a wrist until you have lots of
 time to play around.
 Four functions will serve a psubber well and can be built
 for under 1,000
 dollars. I can send you a convertible top pump to play with
 if you like.
 Hank
 --------------------------------------------
 On Wed, 5/28/14, swaters via Personal_Submersibles
 <personal_submersibles at psubs.org>
 wrote:

  Subject: [PSUBS-MAILIST] Manipulator arm
  To: personal_submersibles at psubs.org
  Received: Wednesday, May 28, 2014, 9:31 PM

  Hey guys. I am
  still working on the manipulator arm project for the
 K  boats. I am a
 little overwhelmed as to what direction to  head. I
 really don't know where
 to start because of my  lack of knolwedge. Does anyone
 have any pointers as
 to where  to start? I am thinking about using electric
 motors rather  than
 hydrolics just because of the amount of external 
 operating
 peices. Thanks,Scott  Waters

  Sent
  from my U.S. Cellular© Smartphone

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