Robotics : 26833


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Subject:	Re: RCX controlled GBC train drawbridge
Newsgroups:	lugnet.robotics, lugnet.org.us.laflrc
Date:	Mon, 5 Feb 2007 20:53:41 GMT
Viewed:	6962 times

In lugnet.robotics, John Brost wrote: > At the bottom it is 10-wide, but the top horizontal > rails are only 8-wide. Ah, OK. No problem then, I was just worrying for a moment that you'd have to further modify the whole thing. > > mass of the counterweight? > > 794 grams... made out of 1/2 used AA batteries of course. Cool. I have an additional 7.73 kg of AA's if we need them :-) > The thing that has been stopping me [from feeding the ball > stream itself] is what to do when the bridge is lifted. Not sure what you mean here. I was just picturing a permenant gently-sloping rail along the entire upper superstructure of the span, fixed in place (it would look something like a loooong shallow diagonal spar or cable span). With the bridge down, the slope is right to carry the balls across. As the bridge tilts up it obviously wouldn't work (wrong angle; any balls that are on it would roll the wrong way), but that's why you'd need the RCX to stop the lift mechanism a little before the actual tilting of the bridge span. I admit I was picturing the ball stream as being "lifted" on the end that has the pivot, and the "low" end to the far side (left, in most of your pictures), but it should work in either case. -- Brian Davis

Message has 3 Replies:

		Re: RCX controlled GBC train drawbridge
On the other hand, why would the bridge need to carry balls at all? Just put the bridge on the section of track that separates the reliable modules from the unreliable modules' loop. But I suppose if the bridge does nothing at all with balls (not (...) (18 years ago, 5-Feb-07, to lugnet.robotics, lugnet.org.us.laflrc)

		Re: RCX controlled GBC train drawbridge
(...) I am 100% thinking along the same line. At first I thought of simply stopping the ball lift and immediately raising the bridge, letting balls along the slope drain backward into a hopper, but after watching the bridge raise and lower, I doubt (...) (18 years ago, 6-Feb-07, to lugnet.robotics, lugnet.org.us.laflrc)

		Re: RCX controlled GBC train drawbridge
(...) Heres a thought. Just have the slope going in the other direction. That way when it lifts, the balls keep rolling the same direction. (Faster and efficient!) If the raising is too bumpy, just find a way to place a third or fourth overhead rail (...) (18 years ago, 7-Feb-07, to lugnet.robotics, lugnet.org.us.laflrc)

Message is in Reply To:

		Re: RCX controlled GBC train drawbridge
(...) Not yet... No train. In fact, all the train track is borrowed from Steve H and Steve's Mom. I've got track on order, but nothing else. Someday maybe I'll buy a train ;) (...) Actually factored that in. At the bottom it is 10-wide, but the top (...) (18 years ago, 5-Feb-07, to lugnet.robotics, lugnet.org.us.laflrc)

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