[PSUBS-MAILIST] PSUBS manipulator

Wed Sep 23 14:13:32 EDT 2020

Very interesting. I have a mix of extreme duty and standard duty, but all
mine are plastic!

On Wed, Sep 23, 2020 at 1:49 PM hank pronk via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alec, I have an actuator with a metal end cap.  I think it is the extreme
> duty model
> Hank
>
> On Wednesday, September 23, 2020, 6:55:22 AM MDT, Alec Smyth via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Oh, that's a good find Alan, I was unaware of the second O ring. My
> suggestion would be to remove the outer one if going very deep, or drilling
> a tiny hole between the two. Else the O-ring would tend to squeeze the
> shaft at depth, freezing it up or increasing current draw. My impression of
> these actuators is that the likely failure point is the top cap (the
> disc-shaped piece that ends the main cylinder). Not that pressure would be
> a problem, but it's a plastic piece and includes the pivot point of the
> actuator, so is subject to significant mechanical stress.
>
>
> On Tue, Sep 22, 2020 at 8:17 PM Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Thanks Alec & Hank.
> I found the diagram below that doesn't show any switches.
> I like the idea of air compensating them, perhaps with an over pressure
> from
> a regulator as Cliff is using on his thrusters.
> The two shaft O-rings are as per the Minnkota, with the outer O-ring doomed
> to fail when the pressure gets high enough. If there was an overpressure
>  the
> inner O-ring would fail first (hopefully)  leaving the cavity between the
> two with air.
> Or is it filled with Greece?
> Alan
> [image: image1.PNG]
>
>
> On 23/09/2020, at 10:49 AM, Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi Alan,
>
> I don't think there are any microswitches in these. Nor in fact any sealed
> components at all that I saw.
>
> Best,
> Alec
>
> On Tue, Sep 22, 2020 at 5:24 PM Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Alec & Hank,
> when I was compensating linear actuators ( a long time ago ) mine had
> micro switches in them that stopped the travel.
> I am not sure whether the Lenco has them or not!
> I was sticking a hot needle through the plastic housing of the micro
> switch to
> help compensate them, as it was pretty well sealed & I feared it would
> randomly
> be switched because of the oil compensation pressure at depth.
> Also the brushed motors were sealed. This again may be a problem if the
> compensating oil hasn't fully filled the cavities inside the motor housing
> &
> suddenly experiences pressure as you descend. The small brushed motors
> can have what Phil describes as a "herky jerky" action when oil compensated
> due to the oil lifting the brushes off as they spin fast.
> Mentioning this in case you encounter problems operating them at depth!
> Alan
>
> On 4/09/2020, at 9:59 AM, Alec Smyth via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
> Hi friends,
>
> The PSUBS Community Projects page (
> http://www.psubs.org/community/projects/
> <https://l.facebook.com/l.php?u=http%3A%2F%2Fwww.psubs.org%2Fcommunity%2Fprojects%2F%3Ffbclid%3DIwAR0h2tBfXPDrd1-qg5NcZGBCqXXe-SKQZMxFCDCBBtSNnaZx42iOOmuBdoc&h=AT3eqKa9glmfxaDQHOwwOXbznLIfHpxLe5qW-frl6GayEG2OzsaSaxmS_Lvj8sXs-zLUYglsW2tGlIPlmjmFChFQaJrsRSDyDSjP67nMCWAbJVXw5DZhN8Yvuy2Lo7fTILWUn7Zl_yu7bz745aO0H2hQ8vlO11fvzI6KwLZjoR3NwjUToX81HiSAaM1PZIXKrGrmU052uyrhlWmYSJvAuvs6-p6qLb1DUxTxVjW3bV4I6um6t4a5ug0bACMZ6jRKmjrNrd2v8l_3IpweTripbVuMdD8-Tc2exR8k4WwugJbNH1vY0vmMP-uhazz1sbpYLw9mAmjxHGux3_adPYa01oDxd8JWplw5ucnC9jWUhQI-5XlHQzPGSFeYRl2u5QAGl8p_K2Fllv8DobTp1wUCZ-TrgDFKgeiAscI18UrCE60RnkfHK8al3tGWM4ZnQ-P_vS02FdO4qiC5gReo23KUQ0yrJoUn5iNnF24W07kMUkDpp4JLTdT-WODzylg-xWTxnsScWBnllTV7BkUe3QwkIq_1NHXX9QPl6kmaL8b4QpNb1KtjXN3oLdkiC3JN0B3TAch0mA3yRZaEsJSG07y8j6RemPfbNs0-LHZh5j4EK7Sw_j6CWmJwViWoS5TPftPt0tsz7hg>
> ) now features an "open source manipulator" developed by Hank Pronk and me.
> This is an intentionally simple manipulator built using only a drill press
> and an angle grinder, except for a few plastic bushings that were turned on
> a lathe for expedience. We purposely avoided things like aluminum welding,
> to keep it's fabrication as accessible as possible. The page contains
> blueprints, photos, and a bill of materials - but I recommend beginning at
> the "Start Here" document in the ZIP file. Please don't hesitate to reach
> out if you have any questions, or if you have any suggested improvements.
>
> Best,
> Alec
>
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