Subject:
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Re: running the motors underwater - update
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 13 Jul 2000 15:35:21 GMT
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Viewed:
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622 times
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Just regular Boston water. God knows what is in it.
Anyway, I decided to use the older 4200 motors for the submarine... don't need
to gear up and there aren't as many holes to plug up.
I covered the entire bottom of the motors in sealent/adhesive (after the wire
was plugged onto it, of course). Then I pulled the black axle thing off, and
put more sealent/adhesive on the outer part of the exposed circular area. I
did this because I had previously taken one of these motors all the way apart
and seen that there are 3 little holes at the front end of the motor, and i
didn't want water to get in there. Then I put some vaseline on the bottom of
the motor shaft and put the axle back on. The sub works great. I have only
played with it for a few minutes at a time, so I am not sure about heating
effects. I let the submarine soak in the sink underwater overnight, though,
and it still worked in the morning. no leaks.
this is a temporary solution, until i decide to make something more complicated
that involves some sort of membrane to account for expanding air due to
heating.
In the book "building an underwater robot" that inspired the idea in the first
place, they have a motor inside of a film canister. I might try this next, but
I'm looking for the simplest solution possible... if anyone has any
suggestions...
yay!
-Ben
In lugnet.robotics, "CS Kwok" <yl711@netvigator.com> writes:
> Are your tank filled with salt water? What is the electro-conductivity
> of your water?
>
> By the way, sinking a motor under water will damage lubricant inside
> the motor.
>
> I suggest you to pack the whole mechanic into a metal case, and seal
> the metal case by silicon. As metal can help to heat disposal under water.
>
> Regards
> CS Kwok
>
> > -----Original Message-----
> > From: news-gateway@lugnet.com [mailto:news-gateway@lugnet.com]On Behalf
> > Of Ben Erwin
> > Sent: Thursday, June 29, 2000 6:44 AM
> > To: lego-robotics@crynwr.com
> > Subject: running the motors underwater
> >
> > QUESTION STARTS HERE:
> >
> > But I was wondering if anyone has done any experimentation with blocking • up
> > those holes at the back of the top of the gear motor and doing underwater
> > tests then? These are the holes that allow you to stick in a small
> > screwdriver and pop off the back panel (which doesn't do much good). Do
> > these
> > holes serve any purpose? i.e. if they help cool the motor or something • than
> > perhaps I shouldn't block them up with silicon?
> >
> > Curious,
> >
> > Ben
> >
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Message has 1 Reply:
 | | Re: running the motors underwater - update
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| Hi Ben It's great! It sounds like we both are using the same book... :o) I also did something similar (you can see some pics at brickshelf). When you say that you used the 4200 motor, is it the 'not geared down' motor? Are you using propellers to (...) (24 years ago, 13-Jul-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: running the motors underwater
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| Are your tank filled with salt water? What is the electro-conductivity of your water? By the way, sinking a motor under water will damage lubricant inside the motor. I suggest you to pack the whole mechanic into a metal case, and seal the metal case (...) (24 years ago, 2-Jul-00, to lugnet.robotics)
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