<div dir="auto">Brian, I've been looking at higher current dc-dc converters recently. The brand I've been looking at is "Vicor." Other brands I've used are Pololu and Dimension Engineering. <br><br><div data-smartmail="gmail_signature">River J Dolfi<br><a href="mailto:Rdolfi7@gmail.com" target="_blank">Rdolfi7@gmail.com</a> <br><a href="tel:(412)%20997-2526" value="+14129972526" target="_blank">412-997-2526</a></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Oct 3, 2017 10:11 AM, "via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Personal_Submersibles mailing list submissions to<br>
<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
<br>
To subscribe or unsubscribe via the World Wide Web, visit<br>
<a href="http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.whoweb.com/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
or, via email, send a message with subject or body 'help' to<br>
<a href="mailto:personal_submersibles-request@psubs.org">personal_submersibles-request@<wbr>psubs.org</a><br>
<br>
You can reach the person managing the list at<br>
<a href="mailto:personal_submersibles-owner@psubs.org">personal_submersibles-owner@<wbr>psubs.org</a><br>
<br>
When replying, please edit your Subject line so it is more specific<br>
than "Re: Contents of Personal_Submersibles digest..."<br>
<br>
<br>
Today's Topics:<br>
<br>
1. Re: magnetic linear actuator (Alan via Personal_Submersibles)<br>
2. Blue Robotics (Alan via Personal_Submersibles)<br>
3. 36v to 24v transformer (Brian via Personal_Submersibles)<br>
4. Re: Blue Robotics (Brian via Personal_Submersibles)<br>
5. Re: 36v to 24v transformer (k6fee via Personal_Submersibles)<br>
<br>
<br>
------------------------------<wbr>------------------------------<wbr>----------<br>
<br>
Message: 1<br>
Date: Sun, 1 Oct 2017 04:28:03 +1300<br>
From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
Subject: Re: [PSUBS-MAILIST] magnetic linear actuator<br>
Message-ID: <<a href="mailto:C7B72FE7-BC74-4A9F-95EB-7BD14985E747@yahoo.com">C7B72FE7-BC74-4A9F-95EB-<wbr>7BD14985E747@yahoo.com</a>><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
Hank,<br>
you mean like a solenoid with a long stroke?<br>
I have been designing a solenoid operated ballast valve but haven't got<br>
round to working out how many turns of wire, how much force I need &<br>
how many amps it will draw.<br>
A lot of solenoids have a short duty cycle, as they heat up pretty quick.<br>
I would imagine this could be a problem if you wanted to hold something<br>
in position for a long time.<br>
Alan<br>
<br>
<br>
Sent from my iPad<br>
<br>
> On 30/09/2017, at 10:32 PM, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> wrote:<br>
><br>
> Alan,<br>
> I have not taken one apart yet but it sounds like it is a tricky one. I was hoping there was some sort of magnetic rail actuator. I have been Googling around but have not found anything yet. I have had superb results with electro magnets under water (fresh) and figure that could be the answer. I will keep looking.<br>
> Hank<br>
><br>
> On Friday, September 29, 2017, 8:07:33 PM MDT, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> wrote:<br>
><br>
><br>
> Hank,<br>
> I spent a lot of time investigating oil compensation of linear actuators along<br>
> with Frank.. He was looking at the Lenco trim tab actuators.<br>
> Have several. The motors in them are small & brushed & run rough in<br>
> oil. When the rod extends that leaves a void inside the actuator that needs<br>
> to be filled. So you end up with an external oil reservoir to fill the actuator<br>
> with ambient pressure oil as it extends. ( so why not just push it out with the oil)<br>
> There are micro switches that I drilled with tiny holes, to let ambient pressure<br>
> in so they didn't trigger under pressure. Also there are electronics in some<br>
> actuators that may be effected by pressure. And of course there is the wiring<br>
> going in to the actuator that needs sealing & the seals on the rod that may need replacing.<br>
> Much simpler to use hydraulics. I did see an electric manipulator operating<br>
> at the Underwater Intervention Convention. Can't recall it's name.<br>
> From time to time I have a google on robot sites to see what is new. Or<br>
> Alibaba to see if the Chinese have come up with anything cheap.<br>
> Nearly bought a kids hydraulic arm toy that you assemble, with view to<br>
> scaling up out of aluminium.<br>
> Keep thinking, but the robotics World is big & if there is a new & easier way<br>
> of doing it they'll find it.<br>
> Alan<br>
><br>
><br>
> Sent from my iPad<br>
><br>
>> On 30/09/2017, at 1:08 PM, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> wrote:<br>
>><br>
>> I have been brain storming looking for a less expensive and less complicated means of building manipulators. The obvious choice would be electric liner actuators, oil filled etc. Then I was thinking about a magnetic actuator like a mag lev rail. Is there such a thing? You know, add more voltage and the actuator moves out further. Any ideas?<br>
>> Hank<br>
>> ______________________________<wbr>_________________<br>
>> Personal_Submersibles mailing list<br>
>> <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a><br>
>> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
><br>
> ______________________________<wbr>_________________<br>
> Personal_Submersibles mailing list<br>
> <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a><br>
> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
> ______________________________<wbr>_________________<br>
> Personal_Submersibles mailing list<br>
> <a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a><br>
> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://www.whoweb.com/pipermail/personal_submersibles/attachments/20171001/1eb29d67/attachment-0001.html" rel="noreferrer" target="_blank">http://www.whoweb.com/<wbr>pipermail/personal_<wbr>submersibles/attachments/<wbr>20171001/1eb29d67/attachment-<wbr>0001.html</a>><br>
<br>
------------------------------<br>
<br>
Message: 2<br>
Date: Tue, 3 Oct 2017 16:40:42 +1300<br>
From: Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a><br>
Subject: [PSUBS-MAILIST] Blue Robotics<br>
Message-ID: <<a href="mailto:32A0AFFE-E039-4893-9936-9A7A72522FD7@yahoo.com">32A0AFFE-E039-4893-9936-<wbr>9A7A72522FD7@yahoo.com</a>><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
Wandered on to the Blue Robotics site & saw these reasonably priced<br>
cable penetrators that may be of use to someone.<br>
<a href="https://www.bluerobotics.com/store/connectors/penetrator-10-25-a-8mm-r2/" rel="noreferrer" target="_blank">https://www.bluerobotics.com/<wbr>store/connectors/penetrator-<wbr>10-25-a-8mm-r2/</a><br>
If I used them I would go over the cable jacket with a good pvc glue.<br>
They also have a 1500 lumen light for $99- that is rated to 300 meters.<br>
<a href="https://www.bluerobotics.com/store/electronics/lumen-light-r1/" rel="noreferrer" target="_blank">https://www.bluerobotics.com/<wbr>store/electronics/lumen-light-<wbr>r1/</a><br>
Alan<br>
<br>
<br>
<br>
Sent from my iPad<br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://www.whoweb.com/pipermail/personal_submersibles/attachments/20171003/f459d555/attachment-0001.html" rel="noreferrer" target="_blank">http://www.whoweb.com/<wbr>pipermail/personal_<wbr>submersibles/attachments/<wbr>20171003/f459d555/attachment-<wbr>0001.html</a>><br>
<br>
------------------------------<br>
<br>
Message: 3<br>
Date: Tue, 3 Oct 2017 10:43:26 -0400<br>
From: Brian via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
To: <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
Subject: [PSUBS-MAILIST] 36v to 24v transformer<br>
Message-ID: <002301d33c55$f93dcce0$<wbr>ebb966a0$@<a href="http://gmail.com" rel="noreferrer" target="_blank">gmail.com</a>><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
<br>
<br>
Before I start scouring the web and before I make any moves - can anyone<br>
recommend a 36v to 24v transformer that supports enough amps to run a<br>
trolling motor or two? Just musing here for now. Thanks.<br>
<br>
<br>
<br>
<br>
<br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://www.whoweb.com/pipermail/personal_submersibles/attachments/20171003/1708d744/attachment-0001.html" rel="noreferrer" target="_blank">http://www.whoweb.com/<wbr>pipermail/personal_<wbr>submersibles/attachments/<wbr>20171003/1708d744/attachment-<wbr>0001.html</a>><br>
<br>
------------------------------<br>
<br>
Message: 4<br>
Date: Tue, 3 Oct 2017 10:59:38 -0400<br>
From: Brian via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
To: <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
Subject: Re: [PSUBS-MAILIST] Blue Robotics<br>
Message-ID: <002801d33c58$3c7251f0$<wbr>b556f5d0$@<a href="http://gmail.com" rel="noreferrer" target="_blank">gmail.com</a>><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
What a great site!!! All sorts of ways for me to spend money. Servos . hmmm<br>
.. Might be small, but maybe one of them could be powerful enough to work as<br>
an external rear thruster actuator . Hmmm .. Mount the new motor on Delrin<br>
bearings so basically frictionless in water .. Hmmm ..<br>
<br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://www.whoweb.com/pipermail/personal_submersibles/attachments/20171003/e99d6268/attachment-0001.html" rel="noreferrer" target="_blank">http://www.whoweb.com/<wbr>pipermail/personal_<wbr>submersibles/attachments/<wbr>20171003/e99d6268/attachment-<wbr>0001.html</a>><br>
<br>
------------------------------<br>
<br>
Message: 5<br>
Date: Tue, 03 Oct 2017 08:07:38 -0700<br>
From: k6fee via Personal_Submersibles<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
To: Personal Submersibles General Discussion<br>
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>><br>
Subject: Re: [PSUBS-MAILIST] 36v to 24v transformer<br>
Message-ID: <<a href="mailto:831527.5364.bm@smtp210.mail.ne1.yahoo.com">831527.5364.bm@smtp210.mail.<wbr>ne1.yahoo.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Brian,<br>
It will need to be a converter as transformers only work on AC not DC voltage.<br>
The difference is a converter uses a chopper circuit to convert the DC to AC so it can then raise or lower the voltage to the desired value then rectifies it back to DC.<br>
Keith T?<br>
<br>
<br>
Sent from my Verizon, Samsung Galaxy smartphone<br>
-------- Original message --------From: Brian via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a>> Date: 10/3/17 7:43 AM (GMT-08:00) To: <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.<wbr>org</a> Subject: [PSUBS-MAILIST] 36v to 24v transformer<br>
?? Before I start scouring the web and before I make any moves ? can anyone recommend a 36v to 24v transformer that supports enough amps to run a trolling motor or two?? Just musing here for now.? Thanks.??<br>
-------------- next part --------------<br>
An HTML attachment was scrubbed...<br>
URL: <<a href="http://www.whoweb.com/pipermail/personal_submersibles/attachments/20171003/76f6725e/attachment.html" rel="noreferrer" target="_blank">http://www.whoweb.com/<wbr>pipermail/personal_<wbr>submersibles/attachments/<wbr>20171003/76f6725e/attachment.<wbr>html</a>><br>
<br>
------------------------------<br>
<br>
Subject: Digest Footer<br>
<br>
______________________________<wbr>_________________<br>
Personal_Submersibles mailing list<br>
<a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.<wbr>org</a><br>
<a href="http://www.whoweb.com/mailman/listinfo.cgi/personal_submersibles" rel="noreferrer" target="_blank">http://www.whoweb.com/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br>
<br>
<br>
------------------------------<br>
<br>
End of Personal_Submersibles Digest, Vol 52, Issue 1<br>
******************************<wbr>**********************<br>
</blockquote></div></div>