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All right, here's a tough one for ya'll.

How can I built a marble pump out of LEGO bricks? What would the mechanism which pushes the marbles up need to look like?

Here's an example in this video: http://www.youtube.com/watch?v=OBb-qyXFb5E&feature=youtube_gdata_player

Unfortunately, one cannot see the mechanism which pushes the marbles upward very well. I couldn't determine what pieces he was using - I think there was a slope, but I'm not sure as to how it moves the marbles up the pipe.

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It sounds like you're looking for a lift. A pump is used to displace fluids. –  Ambo100 Nov 27 '11 at 14:49
    
@Ambo100 Sorry if I used the wrong term - the guy in the video calls it a marble pump. If anyone can confirm that the correct term is something else, I'll be happy to change it! –  Peter Cassetta Nov 28 '11 at 3:06
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GBC'ers always call that "pump". Tha main characteristic of it is that balls are pushed (pumped) through a column, so the mechanism has to support the weight of a whole column of balls. A lift usually only supports the balls it's lifting. And for all intents and purposes, a stream of balls could even be considered as a fluid. –  Joubarc Nov 28 '11 at 7:50
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2 Answers 2

up vote 7 down vote accepted

A pump is one of the most classic GBC (Great Ball Contraption) modules but is indeed difficult to get right.

One of the best illustrations I know is on this site:

ball pump mechanism

Unfortunately, most of the site is in German, but the pictures are usually illustrative enough and I think it's a good source of information for ball machines in general, not only LEGO ones. The best is of course to get in touch with one GBC builder at events and ask for information. EDIT:

Here is a picture based on the model at aforementioned site: marble pump image

Here is a video showing the mechanism in action.

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I'm sure it would be a good source of information if you can read German on a primarily English speaking site. –  Ambo100 Nov 28 '11 at 8:51
    
You're right, the warning about that is in order, I rewrote it a little accordingly. The image would be much clearer on a black background, however, no idea if that's feasible here. –  Joubarc Nov 28 '11 at 12:20
    
does reading it with Google translate help at all? –  Larry Pieniazek Nov 28 '11 at 22:57
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I created a short animation which demonstrates the marble pump in action and added a link to it in the answer. –  Peter Cassetta Dec 14 '11 at 23:57
    
@PeterDC Nice! Frankly, you could have made you own answer with that, considering the effort you put in making this. –  Joubarc Dec 15 '11 at 4:57
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Marbles weigh more than LEGO soccer balls but there is a thriving community of avid "Great Ball Contraption" builders... these move soccer balls from their (standardized) input to their (standardized) output.

They use various techniques including stairstep, conveyor, helix, scoops, and every other motion technique imaginable.

I think looking through their designs will give you lots of ideas

This great site by Phillipe Hurbain ("Philo") should get you started, In particular look at the Ball Pump and Jigsaw module, which has instructions included

Ball Pump GBC module by Philo Hurbain

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Philo's pump is great but blocks now and then, but that's part of the GBC joy, and considering it's one of the oldest GBC modules in existence (that hasn't had parts replaced), it's actually quite resilient. By the way, if you want to see Philo or a great GBC display, I heartily recommend Fana'Briques, end of June in Rosheim (France). –  Joubarc Nov 28 '11 at 7:55
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