UPDATE: building instructions are available on the building instructions page!
Double-tracked is my attempt at a robust tank using the rubber treads. I used the rubber treads instead of the hard plastic treads since they have much better grip (and I have no plastic treads). This worked very well. The only down side to this is that there was no suspension. Also, the gears connecting the front and back treads would often catch on the ground. Overall though, I think this could outperform almost any other Lego tank the same size with hard plastic treads.
You’ve probably noticed that I’ve changed the name from racing truck to just truck. this is because there was too much friction and it was too big that having a fast gear ration didn’t work well. So I did a 1:1 gear ration and focus on how controllable it was since the two motors were linked with a differential, so different speeds on the two motors made different gear ratios and speeds. It created smooth moment and power.
2 motors with one to one gear ration – 1 differential to add them together – drive train – differential – differential.
I enjoyed building this since this is my first build with differentials.
Nothing out of the ordinary for the program. It’s controlled by the PSP-NX-V3. When the program first starts, it finds the center for steering using the Hitechnic PID block. R1 turns the steering right, L1 turns it left, R2 returns it to center. The two joysticks control the two drive motors.
You can download it here.
This is my half tracked vehicle. It is remote controlled by the PSP-NX-V3. In “normal” mode it is driven by one joystick, it has no differential but when turning, the back two motors go at different speeds, simulating a differential. When you hold down the R1 button, it goes into “two joystick” mode where the left and right joystick control the treads independently, great for getting around tight corners, the right joystick also controls the front wheels.
You can download the program here.
You can download the instructions here.
And the MLCad files here.
You can also see this on Rebrickable.
I was a little disappointed about my results this year but I still did better than my first year (2011). I only got 1 trial correct but that one trial was the best trial I’ve gotten ever, but, due to chance/human error, trial 2 and 3 were a fail, lowering my score. Trial 2 seemed to fail due to a shake of some sort. I slowed down that part in the video but I’m still confused as to what happened. In trial 3, the table was lower (there was more than one arena), in the rules it did say that it was supposed to deal with a bit of variation (but it also has said that the last 2 years I’ve done this, but never changed the height). Overall, this is still the best robot out of all three years, if i had completed all three trials successively I believe that i would have gotten second again. They have not posted the final results yet, so I just know that i didn’t get 1st, 2nd, or 3rd, since they announced that.
There are two driving motors. One in the front and one in the back. It is 4 wheel drive but it cannot turn. The drive motors are not geared. The third motor is used to control the arm. that is geared down 1:5. The arm lifts up the front wheels, it drives forward to get the front wheels on the next step, then the arm goes back, and lifts up the back wheels and the robot drives forward to get the back wheels on the step.
The program is really simple. The PSP-NX-V3 remote control’s the robot. one joystick turns the drive motors, and the other moves the arm.
This has two main parts (the front and the back) on the front there is the PF battery box, front driving motor, and the steering motor along with PF LED lights. On the back section there is the back driving motor and the NXT. The two parts are connected by one axle, which stays in surprisingly well.
The program was pretty simple. I used ROBOTC again. The program uses the PSP-NX-V3 to control the driving. Right joystick controls the drive motors and the left joystick controls the steering.
You can download the program here (.Zip)(driver is included and has to be in the same folder)
This uses 3 motors and 2 sensors. On the controller it uses the Touch sensor as the trigger button and the color sensor as an indicating light. There is also a motor on the controller that controls the angle of the launcher. It s linked with the motor that moves the launcher up and down. The third motor moves a 5m beam up and down. When the beam is up it holds the rocket back, and when you press the touch sensor, the beam is pulled down and the rocket is released. The rocket is down a ramp by a rubber band and then fly’s of the ramp.
The program is pretty simple. First you pull the rocket back with the rubber band than turn the black knob to move the beam up – as soon as the beam is about halfway up the motor begins to turn to make sure its all the way up then lock. you can then use the motor on the controller to move the launcher up and down. then you press the orange button and the launcher locks its position and waits for you to press the touch sensor – when you press the touch sensor the rocket is released and the program starts over again.
You can download the program here.
You can download the Building instructions here(PDF).
You can download the LDraw files here(Zip).
The redneck rollor coaster didn’t work well because of striping gears and weight issues so I have given up on that for now. You really need to do that with power functions. I haven’t started work on anything else because I’ve been really busy lately but if you have an idea for something that I should build, please share and I will hopefully begin working on projects soon.
Been very busy with different things the past few weeks but have been able to work on this. the idea is that you drive forward and then slam on the brakes and the whole robot tip forward, the person almost hitting the ground, then it pops right back. my problem has been getting a good balance. This is also my first 4×4 vehicle so i can stop the front wheels to make it tip but sometimes that’s not enough so it has to be put into reverse quickly but sometimes that makes it tip forward too much and get stuck. So, basically, it needs work.
So I don’t have time to make a video for this robot because I am leaving for some different camps soon, I will be back in five weeks to make more robots and videos. I will still be available for questions and comments however.
So, yeah, I was bored and made this, and I’m defiantly not the first to make something like this.
Here’s what I’ve got so far – any ideas of what I should do?
2 Years ago, Yesterday (Yep, I’m a day late), I registered for this site…..I feel like I should say something sentimental.
(Note – WordPress only started calculating visitors in December 2012)
Top country is USA, Second is Russian Federation (seriously), Third is Germany.