[PSUBS-MAILIST] home made actuator

[Alan via Personal_Submersibles]

Hank,
what about using one of these 350W brushless underwater motors
from blue robotics!
https://www.bluerobotics.com/store/thrusters/m200-motor-r1/
They sell them as rov motors & for that use I have reservations, as the prop
could drive sand etc in to the sealed windings & possibly wear through the
insulation. But for turning a threaded rod that moved your trim weight they
might be fine. Certainly save a lot of stuffing round modifying a linear
actuator. I saw these motors on a reasonably expensive rov recently.
Cheers Alan

> On 12/08/2018, at 9:45 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> I just had a look at the one you found, and I did not realize they were DC.  I thought they were AC, well that is awesome!
> Thanks"
> Hank
> 
> On Saturday, August 11, 2018, 3:40:12 PM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Alan,  
> I think they are probably song enough, I just swap the AC motor out.  I don't need 400 lbs to do the job but I need 400 lbs of ballast.  I am actually planning to make a moving cradle that also carries the oil filled batteries.  I don't know how much force it will require, but, the cradle will be on rollers to make it easy.
> I am ready to test for balance, so I will have to switch over to building a test pool.  My plan to put an in ground pool in my new shop is out now because there is a giant lathe in the way.
> Hank
> 
> On Saturday, August 11, 2018, 3:34:01 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hank,
> my first thought was satellite dish actuator.
> This one is claiming 500lb capacity.
> https://www.ebay.com/itm/Venture-18-Inch-Linear-Actuator-36V-Jack-Arm-with-Saddle-Clamp-Satellite-Dish-/271574942987
> But you wouldn't need that with horizontal travel. Any idea what force it
> takes to pull / push it? I assume it is external.
> Just wondering why you need 400lb!  
> Cheers Alan
> 
> 
>> On 12/08/2018, at 8:54 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Hi All,
>> I am in need of a long stroke electric actuator to move my 400 lb trim weight.  Of coarse I want to make one.  I am planning to either add a oil filled trolling motor to a trailer jack or mount the trolling motor to a satellite dish actuator.  I have not dismantled the satellite dish actuator yet to see if it can handle the job.  I think it can but I will see.  
>> Anyone have another idea?
>> Hank
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