Human robot head I modeled, and rigged in blender.
I started the project with the intention of rigging different mechanical pieces in one bigger cohesive project, the human head with full range of motion for the jaw, neck, eyes, etc. I also aimed to have it be relatively easily animated by controlling all the sub-rigs for the different mechanical parts with an external face rig / mocap animation. The animations above is from Unreal's metahuman default range of movement animations for face and neck.
Rendered face range of movement turntable
Side by side rendered and clay-render face, and neck range of movement
Armature has control bones to control the different mechanical parts from a "normal" face rig that can in turn be controlled by a livelink or mocapped animation
Eyes specifically modeled to function realistically, and being inspired by Will Cogley's human animatronic