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 23:34:47 GMT
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Viewed:
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732 times
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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 move the sub (up and down, and steering)?
Since I don't have battery box, I'm plugging the motors on my rcx and using
the remote control to test them. If I plug them to the battery box, with no
rcx in between, are they going to work faster?
If you have some pic I'd love to take a look.
Ricardo
In lugnet.robotics, Ben Erwin writes:
>
> 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 is in Reply To:
 | | Re: running the motors underwater - update
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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 (...) (24 years ago, 13-Jul-00, to lugnet.robotics)
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