Take the 2-minute tour ×  I once tried to make a 4 wheeled Lego
robot using a pivot arm suspension system. The robot was
motorized using 2 Mindstorm (2.0) motors (one one each side). I
can't find and original picture but it looked like this big
black one:  enter image description here  I used a Lego Technic
turntable as the single point of rotation between the two robot
sides bu the robot sagged a lot and there was so much pressure
on that piece that it would not rotate well.  enter image
description here  Q: How would you build a 4 wheels rover pivot
arm suspension system? Considering that it needs to be motorized
thus adding the weight of two motors.  Note: The pivot arm
design can be one of those two: enter image description here
Edit 1: To give an idea of the size, I'm using this Technic
wheels. The final model is about 20cm long and 20cm wide.  enter
image description here  share|improve this question Some
versions of the Technic turntable have more friction than
others. If yours doesn't rotate freely,