Subject:
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Re: Question Burst
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 25 Jan 2006 22:54:14 GMT
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Viewed:
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1589 times
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In lugnet.robotics, Andrew Meyer wrote:
> To the GBC guys: How do you efficiently project a ball from a
> Lego robot several feet?
Well, there's a few methods that have been tried. The first was just to have
two closely-spaced wheels spinning rapidly - when a ball falls between them,
it's shot out. This seems to require heavy wheels and RC motors (gear motors
have been burned out this way - but they work for a while ;-). Another is to use
a "cannon" or tube with an arm that can swing rapidly up, usually driven by LEGO
springs. This seems to be much more accurate (I'll have to reverse-engineer
yours, Chris, but it looks like it's built along these lines?). Another
variation that I've prototyped is to use a rubber-band powered paddle mounted on
a turning axle to fling the balls up a curve. For the GBC, repetition rate
(meeting the 1 bps criterion) is tough, but that might not be the case for your
application.
> Anyone ever build a robot driven by a ball of any size?
I've not, but it's an interesting idea. The soccer balls seem kinda small,
but LEGO does make some bigger ones. Turning the chassis vs. turning the ball
might be an issue.
--
Brian Davis
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Message has 1 Reply:
 | | Re: Question Burst
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| (...) Brian missed a method that worked for me. I put a 14 long lift arm on an RC Buggy motor and created a feed mechanism to put in one ball at a time. The resulting distance was about 25-30 feet. Ultimately, Steve threatened me with the addition (...) (18 years ago, 26-Jan-06, to lugnet.robotics)
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Message is in Reply To:
| | Question Burst
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| As usual, I've stored up a bunch of questions, and I'm sending them out into the great beyond in the hopes that, amidst NXT battles, they will find their answers and return to me ;-) Question 1: Are the omniwheels at (URL) worth US$9.00? I am (...) (18 years ago, 25-Jan-06, to lugnet.robotics)
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