Subject:
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Re: broken motor, how to take apart?
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 23 Jan 2002 04:14:54 GMT
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Viewed:
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1054 times
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This thread encouraged me to investigate a couple of jammed motors that came
with "new" kits I purchased on e-Bay. None of the suggestions for unjamming
a motor worked. I then decided to take one of the motors apart (this
destroys the motor and is also not an easy task!) to see what was causing
the motor to jam. In my case ferrite dust from the motor's magnet was
jamming the armature and preventing it from turning. I see no easy way of
removing this dust. I can also confirm the comment from John Barnes that
even minor pressure on the jammed shaft will damage the internal gearing.
In lugnet.robotics, Robb Greathouse <r_greathouse@yahoo.com> writes:
> I have had luck bringing motors of all sizes back to
> life, by soaking them in WD-40 overnight and then
> spinning them up with an electric drill.
>
> Robb,
>
> --- John Barnes <barnes@sensors.com> wrote:
> > This general subject has been discussed here before.
> > I'm sure you can search
> > the lugnet archives for more info.
> >
> > However, as my supply of motors has aged, I too have
> > noted that they do tend
> > to seize or at least stiffen up with lack of use.
> >
> > I have rejuvinated a few in that state by
> > momentarily applying 9 - 10 volts
> > from a fairly stiff source like a lab power supply.
> > If you apply power in
> > the forward and then reverse direction a few times,
> > you may well find you
> > can "jerk" the motor back to life.
> >
> > The really bad thing to do is to atemppt to force it
> > by turning the shaft.
> > The internal gearing up is so extreme, that in all
> > likelyhood, you will
> > irrepairably damage something. It is much better to
> > try and free the gear
> > train from within!
> >
> > JB
> >
> > In lugnet.robotics, Mike Barrett writes:
> > > Not sure if this is the right group...anyway
> > > Just got back into Lego robot and rebuilt one of my • bots. But one of the
> > > motors has become very tight, will just about • turn. The motor was left
> > > unused for a bout 9 months in a dry room so not • sure what has happened to
> > > it. As it came from my RIS set (brought when they • first came out) I guess
> > > its not under guarantee any more.
> > > I would like to find out what it wrong with it so • has anyone taken one
> > > apart? If so how?
> > > thanks
> > > mike barrett
> > --
> > Did you check the web site first?:
> http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Re: broken motor, how to take apart?
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| hi list! i once got a completely jammed motor from a brickbay seller. i took it apart and found a similiar situation. i was confused very much by the (ferrite?) magnet which isn't a solid block of metal, but some kind of debris which only holds (...) (23 years ago, 23-Jan-02, to lugnet.robotics)
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