Robotics : 26828


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Subject:	Re: RCX controlled GBC train drawbridge
Newsgroups:	lugnet.robotics, lugnet.org.us.laflrc
Date:	Mon, 5 Feb 2007 04:49:16 GMT
Viewed:	7008 times

In lugnet.robotics, Brian Davis wrote: > In lugnet.robotics, John Brost wrote: > > Very slick-looking John. It seems odd that one of the neatest attractions in the > GBC may be only tangentially related to soccer balls, but that is a very nice > design. I especially like the electrical cutouts at both ends. I have to ask, > have you tested it with a train? 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 ;) > > ...it is designed for 6-wide trains. > > ...especially since the GBC cars have a bump-out below the baseplate? Actually factored that in. At the bottom it is 10-wide, but the top horizontal rails are only 8-wide. > What is the mass of the counterweight? And what did you make it out of? 794 grams... made out of 1/2 used AA batteries of course. > That would be wonderful to see, although it implies a way cut off the ball flow > (gravity driven) over the span before the bridge is actually lifted. Manually, a > simple switch throw, wait for the balls to drain from the span, and then lift > the span would work... but since the bridge is key-activated, if the RCX could > be driving the ball lift, upon key insert it could shut off the ball lift and > wait for the balls to drain away, before then lifting the bridge proper. > > > Oh, almost forgot, now with youtube video goodness! > > http://www.youtube.com/watch?v=Yi9e82UC6WY > > http://www.youtube.com/watch?v=xvHrUY5Lw0E > > Very cool. I think it should be pretty easy (if not as pretty) to thread a ball > stream across it. At BF'06 I had a long (more than 3') double-rail of inverted > Technic 16L beams that worked great, with a little sag. Feeding balls onto it > would be the only tricky part (off the other end should by much easier). That was sort of my thought. The thing that has been stopping me is what to do when the bridge is lifted. > Nice work, John! Thanks, John

Message has 2 Replies:

		Re: RCX controlled GBC train drawbridge
(...) You'd need a hopper to store balls that arrive while the bridge is raised. You could probably rig a gate/door onto it that is open when the bridge is down and closed when the bridge is up. Or the entire hopper could tilt backwards with the (...) (18 years ago, 5-Feb-07, to lugnet.robotics, lugnet.org.us.laflrc)

		Re: RCX controlled GBC train drawbridge
(...) Ah, OK. No problem then, I was just worrying for a moment that you'd have to further modify the whole thing. (...) Cool. I have an additional 7.73 kg of AA's if we need them :-) (...) Not sure what you mean here. I was just picturing a (...) (18 years ago, 5-Feb-07, to lugnet.robotics, lugnet.org.us.laflrc)

Message is in Reply To:

		Re: RCX controlled GBC train drawbridge
(...) Very slick-looking John. It seems odd that one of the neatest attractions in the GBC may be only tangentially related to soccer balls, but that is a very nice design. I especially like the electrical cutouts at both ends. I have to ask, have (...) (18 years ago, 4-Feb-07, to lugnet.robotics, lugnet.org.us.laflrc)

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