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"David Eaton" <deaton@intdata.com> wrote in message
news:I8DHDr.u1s@lugnet.com...
> In lugnet.technic, Rob Hendrix wrote:
> > Instead of having the bucket grab a ball from the bin, why not have a bin
> > feed into a gravity tube that is ball sized. Then simply pick up a ball
> > at
> > the other end of the tube.
>
> So, what exactly is a gravity tube? Maybe you mean something like:
>
> Empty Full Half-full
> | | |o| | |
> | | |o| | |
> | | |o| |o|
> | |___ |o|___ |o|___
> |_____ |o____ |o____
>
> Hence, when a ball comes in (from bottom right of the tube), it pushes a
> ball
> out from the top? In which case, I don't think it would quite work since
> the
> number of balls in the reservoir isn't constant, a varying number being
> otherwise occupied on the time-telling ramps.
>
> Or maybe you mean something different? Perhaps something like a
> swing-arm/tube
> that only has room for 1 ball, that flips around? Hm.
>
> Now if only there were a way to create sufficient Lego-suction to suck a
> ball
> all the way up the tube! That'd be pretty sweet... :)
>
> You could also try and prep a ball by using an extra sensor, motor, and
> lift
> timing. Basically pre-emptively lift a ball up the conveyor, use (say) a
> light
> sensor to detect whether you actually GOT the ball up the conveyor, then
> do the
> actual release exactly when the minute is up. If it missed the ball, it
> can just
> try again.
>
> DaveE
Not exactly what I was thinking, but you're close. If you stick your bendy
straw in your 1/2 pint chocolate milk and then turn it upside-down, that's
more of what I had in mind. The tube should always have balls in it due to
the sloped design of the bin forcing balls into the tube (which goes down
and then "bends" more towards level to an end platform where the bucket
mechanism
can pick up a ball. I could draw a picture for reference or build a mock up
if desired...
Rob
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Message has 2 Replies:
 | | Re: Rolling ball clock revisited
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| Hi Rob, (...) I tried a similar mechanism (a large inclined plane with a width reduction in the end), the problem is that LEGO balls are somewhat rough, and they tend to form a locked arch above width shrinking. I even tried to add a stirring (...) (20 years ago, 8-Dec-04, to lugnet.technic, lugnet.robotics)
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Message is in Reply To:
| | Re: Rolling ball clock revisited
|
| (...) So, what exactly is a gravity tube? Maybe you mean something like: Empty Full Half-full | | |o| | | | | |o| | | | | |o| |o| | |___ |o|___ |o|___ |_____ |o____ |o____ Hence, when a ball comes in (from bottom right of the tube), it pushes a ball (...) (20 years ago, 7-Dec-04, to lugnet.technic, lugnet.robotics)
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