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 19:17:21 GMT
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Original-From:
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Rob Limbaugh <{rlimbaugh@greenfieldgroup.}Spamless{com}>
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Viewed:
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848 times
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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, I'm not a purist :) Would a wooden ball start to
> infect the rest of the contraption's Lego parts I wonder .....
I happen to have a LEGO basketball set on my desk... Eyeing it up
against a ruler, it is 14mm in diameter.
Depending on design choice, one might consider using only LEGO
basketballs or soccer balls because other materials would have different
physical properties. Wood will have a different rolling friction
characteristic than LEGO plastic. It would also be a different density.
Also (possibly worth noting), the LEGO basketballs are NOT perfectly
round: the stripes on the ball are recessed grooves. I do not have a
soccer ball handy to compare, so I'm not sure if that is a sphere with a
painted on soccer ball pattern or if it has ridges for the polygon
shapes.
- Rob
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