Subject:
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Re: The Great Ball Contraption
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 7 Jan 2005 18:10:25 GMT
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Viewed:
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5884 times
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In lugnet.robotics, John Barnes wrote:
> Or someone who owns a soccer ball could measure
> it and publish the size.
Well, it's LEGO - it's just a tad smaller than 2 studs in diameter. If you've
got a marble or wooden ball that will roll between two walls two studs apart
(clearance about 1.5 mm on each side) you've got the size. The only real problem
is weight. Regular (glass) marbles are much denser than ABS (how does wood
compare?), so weight-activated devices (tipping platforms, counterweights) may
be tough.
Another option is the LEGO basketballs - we chose soccer balls because, well,
Steve might have a few extra <cough>. But the basketballs are the same size. And
(thank you SMART!) they can be sorted from the soccer balls by the careful
application of a light sensor...
--
Brian Davis
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Message has 1 Reply:
 | | Re: The Great Ball Contraption
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| (...) I'd really recommend against using anything but LEGO balls. If you just want to play around and test, one good place to get a couple balls are the LEGO NBA sets. I've seen them on sale all over. Using any other type of balls will not give you (...) (20 years ago, 7-Jan-05, to lugnet.robotics)
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Message is in Reply To:
| | Re: The Great Ball Contraption
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| (...) Or someone who owns a soccer ball could measure it and publish the size. Most craft stores sell a selection of little wooden balls. It might be cheaper to buy a few about the right size rather than paying to mail genuine Lego ones? Of course, (...) (20 years ago, 7-Jan-05, to lugnet.robotics)
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