Subject:
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Re: Received my RIS 2.0 - the two motors run at different speed! :-(((
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 11 Jan 2003 16:57:48 GMT
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Viewed:
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918 times
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> Well - it's a matter of degree. If one runs half the speed of the other - then
> it's obviously faulty - send it back. If one runs 10% slower than the other,
> then that's just how it is.
>
> Somewhere between 10% slower and half the speed is the point where you'd
> have to regard the thing as 'broken'.
>
> I have a dozen supposedly identical motors - and there is an 11% spread
> between their speeds. (Admittedly, these are the older geared motors -
> I don't have numbers for the newer ones).
It's definitely higher than 10%. When my rover is running far enough, it's
turning right enough to form a triangle whose side ratio is about 1 length
for every 6 traveled, so it's somewhere between 15% and 20% difference.
I will call Lego monday and ask if I can send back *both* motors, to ensure
they will send me back two motors, hopefully they will have tested them.
If they refuse, I guess I'll have to eat my cake and live with it, or buy
some spare motors.
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