Subject:
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Re: High Failure Rate of New Type 9V Geared Motor
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Newsgroups:
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lugnet.robotics, lugnet.technic
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Date:
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Mon, 17 Oct 2005 19:27:02 GMT
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Viewed:
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2728 times
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In lugnet.robotics, Chio Siong Soh wrote:
> Bad tidings! I'm experiencing a rather high failure rate with the new type 9V
> geared motor (#43362). This motor has been discussed before
> (http://news.lugnet.com/robotics/?n=19204&t=i&v=a)
>
> This motor can be easily recognised: when you twirl the shaft it turns very
> little and quickly comes to a halt. And it is lousy for doing the Magic Motor
> Test - connect an electric wire from one motor to the other. Twirl the shaft of
> one motor, the other motor should turn at almost the same speed.
>
> Out of 20 of these motors from 10 brand new RIS 2.0 sets, 6 motors have failed
> on me within less than a year. Some failed within just a couple of weeks. The
> common pattern of failure was that the motors will begin to turn slowly with a
> grinding sound, stiffened up and eventually will get jammed.
>
> A possible cause for this behaviour was given at
> http://news.lugnet.com/robotics/?n=19212
>
> I'm beginning to suspect that there is a design and/or manufacturing fault in
> these new type motors that should be drawn to TLC's attention. Or are they
> already aware of this? If so, why are they still putting them out?
>
> Would appreciate to know what is the experience of others just to be sure I'm
> not jinxed!
>
> C S Soh
I had the same problem with one of mine. Using them in a fast RC car might do
this if it gets slammed into something. I will inform Nathanael Kuipers of the
problem since he works at TLC and can tell the proper person.
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