[PSUBS-MAILIST] home made actuator

Sun Aug 12 07:05:00 EDT 2018

Hank,
that blue robotics motor was 4.5 in lbs torque. (.38 ft lbs) So you would
probably have to gear it anyway, or buy a motor controller that could
handle a lot of amps. They sell motor controllers for that motor. The only thing
that can be a bit problematic with the brushless motor controllers is that 
if they are designed for the hobby market they are normally operated
via a transmitter & receiver not a potentiometer. There are electronics
to get round that.  
I just bought a pressure sensor / temperature sensor & underwater switch
off Blue Robotics. 
I am sure that actuator motor will be DC.
I will be interested to hear how you get on with it.
Alan

> On 12/08/2018, at 10:33 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan,
> That is a very slick motor alright, but it needs a controller.  You know how I try to avoid electronic components whenever possible.  Also i am trying to keep the cost down by using parts that I already have.  I have a satellite dish actuator and I have a trolling motor on the shelf.  I am picking up the actuator today from the shop and bringing it home to tear down.  I am quite excited that it might be DC.
> Hank
> 
> On Sunday, August 12, 2018, 3:57:07 AM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> 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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>> 
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