[PSUBS-MAILIST] home made actuator

Sun Aug 12 19:23:57 EDT 2018

Hank, 
more thoughts that you may not necessarily want to incorporate at 
this stage. The linear actuator is just a turning threaded rod; if we
used an exposed underwater motor like the blue robotics item & corrosion
resistant gear box to drive a threaded stainless shaft, you wouldn't need
to oil compensate & seal the actuator & could have as much travel as you 
wanted. You could even have enough travel to push the 400lb weight off 
the end of it's track, making it a drop weight.
Alan

> On 13/08/2018, at 10:56 AM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hank,
> ok I follow now. The suggestion was just in line with my
> " keep it simple" policy.
> Cheers Alan
> 
> 
>> On 13/08/2018, at 10:48 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> Alan,
>> Yes for sure, except I want to be able to tip the sub up or down to improve the visibility.
>> Hank
>> 
>> On Sunday, August 12, 2018, 3:42:56 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> Hank,
>> maybe Brian is right! Once the trim is adjusted correctly you wouldn't need
>> to touch it again would you? Unless you took your manipulators off
>> or something major like that.
>> You could dive just under the surface & get a diver to wind it, or
>> resurface, wind a bit & try it again.
>> Alan
>> 
>>> On 13/08/2018, at 5:29 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> 
>>> Brian,
>>> Yes that is a great idea, just put the crank by the arm and use the arm to wind it in and out lol
>>> Or I can just open a window and reach out. LOL
>>> Hank
>>> On Sunday, August 12, 2018, 7:42:27 AM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> 
>>> 
>>> Hank,         
>>>             You could always put a hand crank on it !   that would keep it simple ;-)   
>>> 
>>> Brian
>>> 
>>> 
>>> 
>>> --- personal_submersibles at psubs.org wrote:
>>> 
>>> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
>>> To: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
>>> Subject: Re: [PSUBS-MAILIST] home made actuator
>>> Date: Sun, 12 Aug 2018 11:51:48 +0000 (UTC)
>>> 
>>> Brian,
>>> I agree the acme thread rod would work well.  In fact, that is where I started with the idea.  I would need a gear box to up the torque and I am trying to keep it simple to build.  If the other two options don't work out, I will be back to the acme rod.
>>> Hank
>>> 
>>> On Sunday, August 12, 2018, 5:05:26 AM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>> 
>>> 
>>> 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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