Subject:
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RE: Ping-Pong Ball Shooter
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 12 Jan 2000 21:13:41 GMT
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Original-From:
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Jim Thomas <jim.thomas@%AvoidSpam%trw.com>
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Viewed:
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852 times
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> -----Original Message-----
> From: The WordMeister [mailto:dwilcox@wordsmithdigital.com]
> Sent: Wednesday, January 12, 2000 12:21 PM
> To: Lego Robotics List
> Subject: Ping-Pong Ball Shooter
>
>
> Okay, I promise not to mention my rack-and-pinion steering
> model in this
> post ... [Rats, I've blown it already.]
>
> Our current family robotics project is to develop a robot
> that will shoot
> ping-pong balls, as well as hunt them down and reload 'em
> (that part I can
> handle).
Sounds like a fun project...
> What other mechanisms have been tried or could be tried? Just
> looking for
> some additional design inspiration and ideas. I'd like to try a
> pinball-plunger-type mechanism, but haven't figured out a
> good way to build
> it and motorize it yet.
What about a series of drive wheels each set geared at increasing RPMs? You
could use two wheels per stage opposite of each other to squeeze the ball
through and accelerate it since the ball is so light. An alternative might
only need one wheel per stage (at the bottom would give it backspin for more
distance) and you would only need a track on the top (possibly with a rubber
band to supply tension and a tacky surface to work against. This is kind of
like what they use for moving roller coasters in the station. This might
not work at all but if it did you could really have fun with it. There
might be some problems transferring the ball from one stage to the next. It
might be possible to offset stagger the wheels so you could put them closer
together or use pairs of the very narrow pulley-wheels and interleave them.
The ideas are endless...
> I'm pretty well set for pieces as well, having the RIS and
> the Code Pilot,
> plus 1 extra motor, plus lots more Technic pieces. So I have two
> differentials, two clutch gears, and four motors--if any of
> that helps.
>
> --Doug Wilcox
[snip]
Good luck with your design and don't put anyone's eye out... ;-)
JT
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