Our robot’s mechanism of action is based upon two rows of “teeth” (cardboard, hand-cut) mounted onto a “spine” (MDF, laser-cut) which is mounted onto two radial mounts each (ABS, 3D printed), and all four of those are affixed to the foam-core ceiling of our robot.
There is no point to meticulous design without meticulous measurement.
Here are the mandibles successfully attached to the undercarriage. Note the foam core spacers that ensure even distribution and reinforce the somewhat weak cardboard.
We cannot overstate the value of brainstorming in our prototyping process.
A lot of work in CAD for what is basically a hook for rubber bands.
What’s left: now with one day remaining, we need to build what we affectionately call the “counter-spring mechanism.” We’ve already built the “spring mechanism,” which entails those small hooks connecting to the spines in a way that makes the natural state of the mechanism closed and up against the ceiling rather than open. The counter-spring, as the name implies, will counteract the closing force of the spring mechanism, and through a trigger that will be sprung by the hula-hoop, the counter-spring will detach, allowing the strong force of the spring to quickly and forcefully close the jaws, in such a way, we assume, that will gather ball-pit balls effectively. We expect the counter-spring to take about four hours of team time, sparing at least two after that for fine tuning our car and testing it exhaustively.