[PSUBS-MAILIST] home made actuator

Sun Aug 12 18:48:37 EDT 2018

 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 needto touch it again would you? Unless you took your manipulators offor something major like that.You could dive just under the surface & get a diver to wind it, orresurface, 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 lolOr I can just open a window and reach out. LOLHank    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 wouldprobably have to gear it anyway, or buy a motor controller that couldhandle a lot of amps. They sell motor controllers for that motor. The only thingthat can be a bit problematic with the brushless motor controllers is that if they are designed for the hobby market they are normally operatedvia a transmitter & receiver not a potentiometer. There are electronicsto get round that.  I just bought a pressure sensor / temperature sensor & underwater switchoff 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 motorsfrom 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 propcould drive sand etc in to the sealed windings & possibly wear through theinsulation. But for turning a threaded rod that moved your trim weight theymight be fine. Certainly save a lot of stuffing round modifying a linearactuator. 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-/271574942987But you wouldn't need that with horizontal travel. Any idea what force ittakes 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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