14

Would this solve your problem? Depending on the direction of the input, only one axle will turn.


8

The biggest difference I can think of that would impact my choice would be that the standard linear actuator is much more sturdy. The standard linear actuator has a metal pole and is very rigid. The mini linear actuators are made all of plastic, wiggle quite a bit, and whatever mechanism is inside will skip fairly easily.


8

You can use a large gear (3649) with connector pegs (970607) attached like this: Then you can attach the 6x6 plate on top.


7

There's actually a specialized part to accomplish this task. Take a look at the Technic Turntable (2855): This part can be used to create sturdy rotating platforms that can be controlled by gears. It consists of two parts (2855 and 2856) that snap together to allow for smooth rotation about the center. Here's an example from the classic Mobile Crane set: ...


7

Okay, it seems I indeed made a mistake during building, which I solved afterwards: When assembling the rear mudguard, I noticed that the rear wheel had quite a bit more variability in its sideways adjustment and was quite a bit off center, specifically too far to the left. This caused the chain belt to either run slightly skewed or have friction on some ...


7

The large linear actuator extends 5 studs (from 11 retracted to 16 fully extended) The small one extends 3 studs (from 7 retracted to 10 fully extended) That's a large functional difference.


6

I've seen this done in a GBC module that counts the balls that pass by. It worked with scales that eventually tipped over, each scale representing a decimal of the total number of balls that passed by. Can't exactly find the GBC module but found this clock from jkbrickworks that uses the same principle.


5

It sounds like you need a stronger differential. Might I suggest this design by Nazgarot: If you make two, you can build a big and sturdy subtractor like this (probably customizing the gear ratios to your requirements, the right gearing could also remove the need for a PF switch): Here's a video of it in action:


3

Here is a possible implementation using this exact part: Video . There are also several other solutions with different pieces if you need more inspiration or explanation: Animated GIF, 4 wheel steering, Top-down view.


3

Ok, I have managed to build a working cam mechanism using LEGO Technic. Only thing missing is a big enough spring or elastic band to pull the entire assembly upwards - Still thinking through that part but sharing in the hopes that others can take my idea further (My current best thought is to have rubber bands on the outside of the mechanism pulling the "...


2

I don't know if this is practical, and I can't test it as I don't have enough compatible balls to build GBC type mechanisms, but what comes to mind is: Have the balls run down a trough. The trough ends in a segment of trough which is 10 balls long and pivoted about the long axis. The triggering ball causes the trough to spin about that axis, dumping the ...


2

What you can do is use an old-style spring loaded missile, the rubber tip is soft enough to let you trigger the launcher without putting the missile back in, and you don't need to trigger the launcher to lock the missile. I you press the flat bar at the top it works about 90% of the time.


1

Yes, of course, you can As jncraton mentioned in a comment: The answer to whether this is possible is definitely "yes". NAND gates can be built, and the required logic can be implemented using NAND gates. The questions is primarily about how this can be achieved. Logic gates in LEGO As you can see here folks have put extensive work into creating logic ...


1

In the Ackermann system the lines through the rotating point of the wheel hub and the trackrod joint intersect on the rear axle. This works when the trackrod lenght is shorter than the hub turning point distance. For this part to work, you need to have a fixed ratio between axle track and wheelbase. So a long narrow car won't work and a short, wide car won'...


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