[PSUBS-MAILIST] electric manipulator

[Rick Patton via Personal_Submersibles]

Hank
Simple is good. looking forward to following this as I might be paying you
to build me one if it works out well. Did you ever locate any one to UT
your welds yet and did you get your floor fixed from the weight of that
giant milling machine?
Rick


On Sun, Nov 12, 2017 at 10:49 AM hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Rick, you can use sea water in an aluminum or composite  cylinder  if you
> use a water pump for generating the pressure.  There are water pressure
> manipulators out there.  I am building a full electric manipulator to
> reduce weight and I think it will be much simpler than a hydraulic
> manipulator.
> Hank
>
> On Sunday, November 12, 2017, 11:34:23 AM MST, Rick Patton via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Hank,
> I was told that I could use the power tilt rams for an outboard motor on a
> manipulator and replace the oil with salt water but have not pursued it
> further as that project is still a ways away.
> Rick
>
> On Sun, Nov 12, 2017 at 1:36 AM, hank pronk via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi All,
> The electric manipulator project is on hold because I am not happy with
> the home built actuators.  I made two, one is linear and the other is
> rotary.  They work just fine but are under powered.  I thought I could
> compensate for the low power by spring loading the members.  This helps a
> lot, but in testing I find it inadequate.  I bought a trim tab  actuator
> that is fully submersible that I can experiment with.  I hope to simply
> remove one o-ring from the shaft and air compensate it.  One nice feature
> is the screw system requires no limit switches.  The actuator is cheaper to
> buy than build from scratch.  Luckily the new actuator is the same size as
> what I built, so they will fit the manipulator.
> Hank
>
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