[PSUBS-MAILIST] Manipulator arm

Thu May 29 18:22:54 EDT 2014

Hank,
Do you have any pictures of your manipulator arm?
Thanks,
Scott Waters

Sent from my U.S. Cellular© Smartphonehank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote: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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