This is my Lego Technic cube.
It has exciting features, read the review for the details. Watch the video at the bottom of this page!
About this creation
Way of movement: Power Functions, 2 PF M Other functions: PF LED, yellow cover lifting by one PF M Dimensions: 15x15x15
After building nice-looking MOCs, I also liked to build a MOC with no much design, but with a high technical complexity. Then I hit upon the idea of building a cube, really a CUBE . What you see here, is the consequence of this idea: a full-remote-controlled 15x15x15 Lego Technic cube with spy cam(era) and a complete wheel-hiding system.
The upside: of course 15x15. I had to add recievers, they couldn't be located under the yellow panels because then the panels would reflect the infra red waves from the PF controller. Therefore, I decided to build them at the top, with their tops as part of the yellow cover.
The drive system: due to the minimal space available (a 15x15x15 cube has only 13x13x13 inner space!) I had to be careful with space, therefore choose for a simple transmission. The transmission contains two 20-12 gear combinations, transferring power in an angle of 90 degrees to the side. The speed delivered by this system was very good. I choose for small wheels, but not too small, to guarantee minimal wheel slip, also on a deep-pile floor covering. The M-motors where in up-lifted positon still only 4 millimeters (!) from the floor.
Of course, there were practical problems. How do you put on the batterybox? To give access to the batterybox, I have chosen for an invisible small cover. It worked well, it can only be discovered when you know where to search, when you don't know it, you won't find it.
In the same way, I created a small cover to put the spy cam on. This cover was located at the 'back'. Actually, this vehicle has no front, no sides, no back!!
The cube lifts itself to drive. You can see here the wheels. I didn't use the non-axle version, but added an axle version into 4 non-axle version tires. When lifting, the yellow cover, including the recievers is lifted up by one a href=http://http://www.bricklink.com/catalogList.asp?q=gear+rack> gear rack, driven by one extra PF m-motor located under the recievers. The wheels, including batterybox and the three PF-m-motors are always standing on the floor (in practice, the wheels could be lifted higher than the cover!).
Of course, also the camera needs a hole. But the inside of the yellow 15x15x15 cover is not lifted, and due to the limited inside space, it was too difficult to connect the camera to the moving yellow cover. The solution was simple: most times a camera only films when the cube is driving. Therefore, when the wheels were 'up', the camera was not before the hole, but above it. When the wheels are down, the pinhole cam is before the opening and is able to spy! Below you see the spy cam's lens, when the wheels are down (you could also say, when the cover is up!).
Above of the batterybox, a small space was left, exactly fit for the large block of the PF LEDs. Therefore, this cube is equipped with LEDs, to give signs. In the video, examples of it are given.
You might have become curious about the inside of this mysterious cube. Therefore I added this photo. Clearly to see: the pinhole lighter CAM, the batterybox and the recievers.