The initial idea was to make a robot explorer. However, I encountered some technical difficulties as the inaccuracy in the cut pieces and imperfect alignment between the wheels and tracks. Still, it was an enjoyable project and it worked satisfactorily.
If I had a laser cutting machine ... (Got it?)
Step 1: Materials
- A cardboard box;
- 3 sheets of A4 paper;
- 2 screw rods (easily found at hardware stores);
- 16 nuts and 16 washers (same diameter of screw);
- White glue;
- Hot glue;
- 2 servomotors -2Kg of torque (adapted for continuous rotation);
- Radio and receiver 2-channel (minimum);
- Plastic tube;
Step 2: Wheels
I did the first drive wheels as the construction of the mat would depend on them.
They were carried out as shown with 12 divisions on both sides.
The smaller circles, which are at the center, were made to hold the arm of the servo and had this hole in the middle in order to tighten the screw on the arm of the servomotor.
Step 3: The Mat
The mat gave-me a little more work.
The cardboard was crushed on the inside to allow make the circular movement with less resistance. I made a template by measuring the distance that each of the divisions of the wheel. After that, it was enough to cut and paste these boxes.
Note: Use white glue because it is stronger. If you use hot glue will loosen and give a hell of a headache, believe me! At this time, have to be patient.
Step 4: Support Wheels
The distance between the walls was so that my laptop would fit between them as he had in mind creating an autonomous vehicle.
Screws were used to separate the side wheels and to support the same time. Once placed in the correct place, I used a drop of glue on each nut to lock them.
In place of servos, put a piece of cardboard on the outside, as the image, so that the wheels were a little further away from the sides of the vehicle.
Step 5: Preparing the Wheels
Within the wheel, put a piece of plastic. This was necessary because the the screw was holding the wheel and sometimes wearing the center of it, causing her to be unbalanced. After that, a washer pasted on each side of the wheel.
In the drive wheels, I fixed an arm of the servomotor with bolts and kept the center screw in order to hold the wheel on the servo.
Step 6: Mounting the Servos and Wheels
To align the servo, I used three pieces of the screw, as shown in figure.
After assembling the wheels and set the Track with the traction wheels, I noticed that the rear wheels caught on the sides. Was just enough to round the corners.
Step 7: Final Assembly
Here, I show in more detail how the wheels were placed.
The track has to get a little traction but not so much.
After setting the size of the mat, put together with the traction wheel and screw.
To control, used a radio control with the receiver connected to a "mixer" which allowed control it with only two radio channels.
Hope you enjoy.