[PSUBS-MAILIST] PSUBS manipulator

[Alec Smyth via Personal_Submersibles]

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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