Questions tagged [gbc]

Questions related to Great Ball Contraption, a ball transporting machine seen at a lot of LEGO events.

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8 votes
3 answers
1k views

Is there a true ball/sphere LEGO piece (or pieces that together form a ball/sphere)?

I recently started experimenting with GBC machines build out of LEGO. Ball bearings are ideal as balls (have a lot of momentum due to their weight), but are also impacting on the LEGO bricks hard ...
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5 votes
1 answer
382 views

Continuous power supply for the SPIKE Prime or Robot Inventor hubs?

The hubs present in the Mindstorms Robot Inventor or SPIKE Prime sets have 2100mAh lithium-ion batteries which can be charged with the accompanied cable with a micro USB connector on one end and a ...
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4 votes
1 answer
381 views

Mounting 'shelves' on a 57518 Lego conveyor belt

For a school project I'm trying to build a conveyor belt out of LEGO. I'm currently just working on the design so I haven't ordered anything yet. I think that for my build the 57518 pieces are perfect....
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6 votes
1 answer
487 views

Any build instructions for vertical Technic/Lego conveyor belts?

I'm trying to figure out how to continuously lift a stream of incoming pieces up vertically, at least 10cm. This is my first real custom build attempt, so I'm very much at a loss on how to go about it....
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9 votes
3 answers
1k views

How can I get a Powered Up motor to run without using a hub?

I'm mainly taking part in LEGO events as part of a Great Ball Contraption exhibit. Most of the modules I make, and that's true for a lot of other builders, are purely mechanical in nature and driven ...
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5 votes
1 answer
387 views

Any cheap Technic sets with a good variety of parts?

I want to start building a module like GBC Miniloop 01, but when I check the part list some are very hard to find. How should I get started with miniloops? BTW, I got a very big set, Bucket Wheel ...
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  • 235
9 votes
3 answers
6k views

How to run "Power Functions" devices from an electric wall plug?

In this video showing an example of Great Ball Contraption (GBC), we can see (at 1:35) that some trains powers are used to run Power Functions motors: That must be more convenient than having to ...
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  • 447
13 votes
1 answer
1k views

Mechanical auto-unblocking mechanism

I have a GBC module1 which is quite simple but blocks regularly because a ball happens to be at just the wrong place at the wrong moment. Per se, it's not a problem as a Technic Gear 24 Tooth Clutch ...
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