Torso

The torso of Dropbear is a key structural component that integrates several functional elements, providing both support and housing for essential systems. It contains the main battery pack, which powers the robot’s operations. The battery is centrally located to maintain an even weight distribution, aiding in balance and reducing strain on the actuators.

The torso also supports the Stewart platform mounted at the neck, allowing the head to have full articulation. Structural stability is achieved through extruded aluminum links, which form the main frame of the torso. These links provide rigidity and durability while keeping the overall weight manageable.

At critical connection points, the extruded links are joined using 3D-printed parts, which act as hubs for linking components. These hubs serve multiple purposes, including providing anchor points for the shoulder actuators that drive the arms, as well as connecting to the pelvis girdle below. This configuration ensures that the upper body has both the flexibility and strength needed for movement, while also maintaining a cohesive structure to support the robot’s weight and dynamic motions.