LegoBNX

I bought two yesterday to make Lego GBC modules out of it (comes with basically all the things you need). They are separate though so in the future I can disassemble the GBC and build the excavators themselves. It really is a wonderful set but the arm of the excavator is said to work slow.

Yes, some motors sometimes work on different speeds however the difference shouldn't be serious. I have personally experienced two identical Lego City trains ran by the same, brand new batteries and one was going slightly faster. You can easily test it by creating a "conveyor belt" with a marker on it. Set a timer for ex. 30 seconds and count how many times the marker passes a fixed point you establish. If the difference is less than one rotation then I suppose it is negligible. If it is more than one then you can ask for a refund or warranty change.

Well, thanks for all the positive feedback so far. I am currently planning four more modules: - spiral lift module - chain link lift - perpendicular connector lift - marble tower/shovel/two layer sweeper The latter is still undecided and I will go for what will fit in to the whole thing perfectly.

Hey there! I'm Binx and recently I have started my own Lego Great Ball Contraption. Since this is my first attempt, the contraption isn't that complex and I also had limited resources (now resolved with a visit on bricklink). The great ball contraption consists of 3 modules in series: 1. Archimedes screw 2. Jigsaw 3. Sweeper There is currently no "bring back" as I am developing one now. The parts I have purchased will make up for a spiral lift module, a lift and a ramp that will be the "bring back". I also bought more balls since I could only find two in my Lego boxes (never really was a fan of Lego football/basketball). Just one more thing. I once saw people frequently asking how to reduce the motor speed of the electrical motors used in GBC's. This is done by gears. Speed can be both increased and decreased by editing the gears. For example, we have a PF motor and want to decrease the speed. We insert the axle and then the smallest Lego gear, the 8 tooth. From then we can vary the speed by applying other gears. The more teeth the second gear has the slower it goes. The reverse action increses the speed, i.e. attaching a 40 teeth gear to the PF motor and then connecting it to a 8 tooth gear (torque ratio 1:5 {1 turn of the big gear makes the small one turn 5 times}). So please rate, give feedback and share your ideas. I am really planning to expand this GBC to at least 6 modules. http://www.youtube.com/watch?v=i8U82ydYj48