Becak Rover

###Design
Design is not tested! Experimenters welcome.

In Indonesia, "becak" is a local human pedal powered, three wheeled vehicle for transporting up to 2 people or goods.

This rover can steer the drive wheel up to 90 degrees, enabling almost zero turn radius.

Overall size is 14 cm long and 11 cm wide.

Sonar sensor mount is from https://www.thingiverse.com/thing:2212833

###Parts needed:
FF280 DC motor, or something with similar size
SG90 or MG90 servo
18650 battery holder, single type, x2
4 mm steel balls x8
A number of m3 screws (examine the blend file)

###Post processing:
Use hand tap to make thread for m3 screws in some holes.
Clean the other holes with 3mm drill.
To assemble the bearing:
1. Orient the chassis vertically.
2. Place all the steel balls, clumped together.
3. Position the inner race (wheelpod).
4. With a toothpick , needle or tweezer, distribute the balls roughly along the circle.
5. Carefully tilt the whole thing into horizontal, the balls will not fall out.
6