EVA
EVA is the second robot built by our 4008B subteam, created for the VEX Tower Takeover game. It consists of a drivetrain, a vertical intake system, and a claw, allowing it to stack cubes and place them in towers.
Chassis/drivetrain
The drivetrain contains 4 omni-wheels which are each powered by a motor, allowing EVA to move extremely quickly. For the chassis, instead of being 18 by 18" as we've done in the past, we opted for a shorter chassis, causing the claw to extend past the frame and help EVA place cubes in the protected zone without interference from the front wheels of the chassis. Later in the season, we added a small stopper at the back to prevent tilting.
Vertical intake/elevator
The elevator is a key function of our robot. It allows EVA to easily reach up at different heights for stacking cubes or placing them in towers.
There are two stages of the elevator which are able to smoothly slide against each other using linear sliders, sprockets, and chain. The stages are also connected by rubber bands, creating enough tension to hold the stages in place when extended.
Claw
EVA's claw was built with a square-like shape to best fit the shape of the cubes used in the game challenge. The arms of the claw would form 90 degree angles and were lined with anti-slip mat, providing friction and allowing the claw easily grip the sides of a cube.
