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, 29 Oct 1999 19:37:33 GMT
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Original-From:
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alex wetmore <alex@phred=AntiSpam=.org>
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Viewed:
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3421 times
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From: "Chris Phillips" <chris.phillips@computerboards.com>
> In lugnet.edu, Scott Arthur writes:
> > I've thought about using two motors for steering.
> >
> > Do they turn at exectly the same rate?
>
> Generally not. I've built robotic platforms that use a pair of motors to
> drive the wheels so that the robot can move "straight" or turn in place. • I've
> found that the motors typically have large variations in speed that make • the
> robot veer to one side or the other when it is trying to go straight. • I've
> done experiments with angle sensors to try to detect navigation errors and
> modulate the motor speeds accordingly, but haven't had much success so
far.
The adder/subtractor is an all mechincal design which handles this flaw.
Take a look at http://www.phred.org/~alex/lego. I'm sure that others will
chime in with their designs as well.
It does have a few disadvantages:
1) More mechanical complexity
2) Generally only one motor is in use at a time. This makes your robot a
little less wimpy when going straight.
On the other hand it is such a cool design that it is worth building just to
play with it.
alex
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Message is in Reply To:
 | | Re: lego Technic "class"
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| (...) Generally not. I've built robotic platforms that use a pair of motors to drive the wheels so that the robot can move "straight" or turn in place. I've found that the motors typically have large variations in speed that make the robot veer to (...) (25 years ago, 29-Oct-99, to lugnet.edu, lugnet.technic, lugnet.robotics)
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