Design The chassis is carrying all the weight and also taking damages. These robots are moving with a holomonic motion. Since there is a limitation on the dimension of the robot we have to have openings on the chassis for the wheels also to make the robots to move holomonically they have to be placed with angle. Front wheels are placed 30° and back wheels are placed 45° with respect to the horizontal axis. Also the chassis must have screw holes and weight reduction holes since weight is also an important factor for the speed, acceleration and deceleration of the robot.
Material For the first two generation of robots I have used 6060 aluminum it was a soft material for the job after couple of games I started to see some dents also chassis bended dramatically to affect the movement of the robot. On my third generation robots I used 7075 aluminum. After 2 years of using these chassis they also started bend during servicing the robots. On my fourth generation robots I used steel to protect it from rusting also to look good I used phosphoric acid anodizing on them. Since steel is heavier than aluminum I had to add many holes on the chassis to keep the chassis lighter also had to do some bending testings while adding these holes. So far I'm happy with this new chassis, but if I catch something wrong with it I will post it here.