[PSUBS-MAILIST] PSUBS manipulator

[Alan via Personal_Submersibles]

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



> 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/ ) 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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