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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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> 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.
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 a good test of exactly how soccer
balls will operate in a machine. I'm 100% sure of that.
Steve
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In lugnet.robotics, Steve Hassenplug wrote:
> > 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.
>
> 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 a good test of exactly how soccer
> balls will operate in a machine. I'm 100% sure of that.
>
> Steve
Over time, as I gaze at my collection of parts, notably as my interests change,
and curiosity is peaked, I realise that the floccinaucinihilipilification
parts, such as soccer/basketballs, now are not only useful but in serious
demand. I guess that also means eventually I will also find uses for all those
wheels, that seem to multiply on their own, as well. Sigh.
Janey "Red Brick"
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