Team 21 - Design Process

The design process of this project was based on the dimensions of the helmet due to the size of the mechanism being limited to the internal volume of the helmet. The helmet itself was found online, we simply modified this to make the faceplate into quarters instead of 1 whole piece. In terms of the mechanism, we thought of a creative way to create both vertical and horizontal movement simultaneously. This was achieved through 3 main parts, a single motor providing rotation, and torque, a gear/bevel gear system that transmits the torque, and  4-bar linkages that satisfy our required motion. We chose gear dimensions that satisfy our requirement of more torque at a low rpm of the motor. We chose a motor that came with a 6mm input shaft, that has a low rotation speed, and one that is small enough to fit within the helmet.  In terms of overall materials, we used PLA for our 3D printing as its simple and sturdy enough for our requirements, we used laser-cut acrylic spur gears as they are both strong and readily accessible, and our four bars were made of laser-cut plastic, and linked with metal bolts, and the bevel gears were 3D printed using PLA.