Subject:
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Re: lego Technic "class"
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 14 Sep 2001 18:54:06 GMT
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Viewed:
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4851 times
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Ken wrote:
>
> > As an aside, has anyone had trouble with motors seizing up? I have had 4 of
> > the geared motors before the two in RIS and one in Cybermaster. One is ok, two
> > cannot be turned by hand and one has stopped altogether. Having completely
> > dismantled the seized motor I discovered a fine black magnetic powder inside.
> > Taking the motors apart is not to be recommended. Even popping the back off
> > carefully can make a mess of the case.
>
> Actually, the reason I'm looking here is because I had a motor die recently
> for no apparent reason. It's become really difficult to turn the spindle by
> hand and it only gives about 100 RPM instead of the nominal 360.
>
> I HAVE found a good way to get the back off the motor without scoring the
> four pins at the top. If you stick a thumbnail in the BOTTOM of the back
> closure, the two retaining lugs there are easier to remove than the big ones
> at the top.
>
> I remember seeing a site recently that described the internals of the motor
> very well and I've ben searching for it for ages! Anybody got any pointers?
>
> I have 6 of these motors and all of them turn at different speeds from the
> same battery. I have testing this with a Mindstorms RCX and an angle sensor.
> I attach the motor to the sensor via a 3:1 gear and switch it on for 10
> seconds counting the revolutions on the angle sensor. They do anything from
> 290 to 340 RPM. I tested them 6 months ago and the speed of each has
> decreased by about 7% on average. I'm not discounting the possibility that
> this could be battery fatigue.
I've had 6 bad motors out of 15 or so. Some out of the RoboSports sets
but non from an actual RIS or RDS. LEGO will replace the motors are no
cost. Sometimes you must send in the bad motors in their return
envelope.
I had one motor that would spin normal until torqued. Then it would just
spin inside and not the shaft. LEGO didn't want that one back and I use
it as a power generator. Wind power.
Dean
--
Dean Husby
LUGNET Member #320
TFM's LEGO Workshop - http://www.akasa.bc.ca/tfm
The Vancouver LEGO Club - http://www.akasa.bc.ca/vlc/
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Message has 1 Reply:
Message is in Reply To:
 | | Re: lego Technic "class"
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| (...) Actually, the reason I'm looking here is because I had a motor die recently for no apparent reason. It's become really difficult to turn the spindle by hand and it only gives about 100 RPM instead of the nominal 360. I HAVE found a good way to (...) (23 years ago, 14-Sep-01, to lugnet.robotics)
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