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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Thu, 13 Jan 2000 22:22:21 GMT
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Original-From:
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Jim Thomas <jim.thomas@trw.comIHATESPAM>
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Viewed:
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512 times
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I think both the catapult and slingshot would be very impressive devices.
However, the biggest problem I see with both of these (and particularly with
the catapult) is that they involve significant linear acceleration and
deceleration of structures in addition to the projectile. This means the
base vehicle must be massive enough to absorb the energy of these
mechanisms. If you can keep the mass of moving launch mechanism low
relative to the mass of the base then it should work great. I think the
slingshot (or crossbow) type arrangement has better potential because of
this. Built in automatic reloading is probably the most difficult aspect to
both these designs.
JT
> -----Original Message-----
> From: Dave Johnson [mailto:djohnson@sirius.com]
> Sent: Thursday, January 13, 2000 12:34 PM
> To: lego-robotics@crynwr.com
> Subject: Re: Ping-Pong Ball Shooter
>
>
> The WordMeister wrote:
>
> > I want to thank the list for such excellent suggestions. • Here's a progress
> > report:
> Somehow the original post didn't make it to the list for me,
> and I don't
> see it on lugnet either...but this is a great project!
>
> A couple ideas that may or may not have been put forth yet
> (and may or
> may not be useful):
>
> A catapult sort of thing, either motor-driven or rubberband
> driven (in
> the latter case, you'd need to "cock" it with a motor - a
> "pull back and
> let go" sort of gearing mechanism could work for this, perhaps). This
> would look really cool, but would be bulky, I suspect.
>
> A slingshot. Again, you'd need to use a motor to cock it, but
> you could
> certainly get good ball velocity this way.
>
> Just some thoughts, I'm looking forward to the initial message(s)
> catching up with lugnet.
>
> Dave Johnson
> Still Unbalanced
>
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Message has 1 Reply:
 | | Re: Ping-Pong Ball Shooter
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| (...) I have built a catapult that fired tire rims mounted on short axles. The reloader was the only part of the design that worked reliably, and could probably be used to load ping-pong balls instead with a few modifications. The basic design was (...) (25 years ago, 14-Jan-00, to lugnet.robotics)
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