[PSUBS-MAILIST] actuators

[Alan via Personal_Submersibles]

Cliff,
the slow stroke of the actuator could have been oil lifting the brushes 
of the actuator motor if it wasn't just through forcing the oil through tubes.
I found my linear actuator motors ran really rough in oil. I think it has
a lot to do with the viscosity of the oil compared with the size of the motor.
Ie. you might compensate a large motor with a certain viscosity of oil
but you would have to reduce the viscosity of the oil in proportion to
the size of the motor for the brushes not to lift!
Can't wait for all the reports & videos once you get over your drive!
Just welding up my motor test jig at the moment, your set up has been
an inspiration.
Cheers Alan

Sent from my iPad

> On 5/07/2018, at 1:29 PM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> I used small plastic accordion shaped reservoirs, one per actuator.  Worked ok but oil seemed to make them stroke slower.  I had them place on control surfaces for first Islamorada psub convention.  Dives were shallow.
> 
> Sent from my iPhone
> 
>> On Jul 4, 2018, at 3:42 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Hi Cliff,
>> At Lake Tahoe, you mentioned that you oil compensated your Lecno actuator.  Did you use a bladder reservoir?  Did you have any time in the water with the actuator under pressure?  
>> thanks'
>> Hank
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