Improved Mars Rover

I noticed one particular gear causing a lot of slipping, the large one driving the bogie. It misbehaved in two ways:

The large gear was pushed sideways by the force of the motor, pushing apart the frame and causing the top gear to slip.

The large gear exerted force on the bogie, pushing one wheel off the ground under force.

To solve these issues, I used a smaller gear and reinforced the frame. This helps keep all the gears together and all the wheels on the ground. The robot can now climb much bigger obstacles.

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EV3 Mars Rover

I have tried before to make a Rocker-Bogie robot, similar to NASA’s Mars rovers. But with the NXT I always had a shortage of structural parts, leading to incomplete and unstable constructions.

With the EV3 it works surprisingly well, and I was able to power all the wheels with two motors, and leave enough parts to make a robotic arm.

It looks lovely, and the principle works, but the actual capabilities are slightly disappointing as the torque is very limited. Climbing any large obstacles pushes the bogie off the ground and rattles some of the many gears.