[PSUBS-MAILIST] Manipulator arm

Thu May 29 17:30:50 EDT 2014

Alan,
The arm is very smooth on Gamma except for the swing.  The reason it is smooth is the extreme low flow rate with 1/8in lines.  The swing is jerky because the swing cylinder is to short making the swing to fast.  I presume in the water it will be a bit better due to water resistance, like an oar on a boat.  The valve bank does not need to be near the pilot, Gamma has the valve outside the hull.  
Hank
--------------------------------------------
On Thu, 5/29/14, Alan James 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, 5:18 PM

 Hank,Firstly I'm just learning
 about this stuff.I
 came across these control valves that looked reasonably
 priced.Directional Hydraulic Control
 Valves | Hydraulic Control Valves | Hydraulics | Northern
 Tool + Equipment
 With the convertible pump idea you
 would save space around the pilot control area by having
 small electricswitches instead of large valves, but
 wouldn't you lose the ability to slow the movement down.
 It wouldjust be an on / off jerky
 movement.They do have reasonably
 priced solenoids on this site  with
 "soft shift" which I presume means a degree
 ofcontrol rather than
  full on / full off.http://www.northerntool.com/shop/tools/category_hydraulics+hydraulic-valves+power-solenoid
 For $139- per degree of movement plus
 the price of one power unit, (round $500-) you could have
 electric control.Power
  units-http://www.northerntool.com/shop/tools/category_hydraulics+hydraulic-power-units
 Alan  Directional
 Hydraulic Control Valves | Hydraulic
 Control...Directional Hydraulic Control
 ValvesView
 on www.northerntool.comPreview
 by Yahoo

 From: Hugh Fulton via
 Personal_Submersibles
 <personal_submersibles at psubs.org>
  To: 'Personal
 Submersibles General Discussion'
 <personal_submersibles at psubs.org> 
  Sent: Friday, May 30, 2014
 8:36 AM
  Subject: Re:
 [PSUBS-MAILIST] Manipulator arm

 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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