Joints
I had several different notions about how to best create pivoting joints.
- Live hinges, flexures made of plastic, would be too inaccurate
- Monolithic creation of all pivots during growth in the SLS machine would be too innacurate
- bearings would be really cool, but too expensive
I finally settled on making the pivots out of stock shoulder screws, and reaming out the parts to a proper fit, and relying on the porous, lubricious nature of the SLS nylon as a bearing surface.
Linkages
Presently the linkages are a work in progress. Standard R/C equipment will be used wherever possible to keep costs under control, but the eyebrows are proving to be difficult, as they’re in close proximity to the eyelids.
Motors
Motors will be R/C servo motors, the kind in small aircraft, boats and cars. The smaller the better, so long as they have the torque.
Presently i am using two types. A vary small one for the eyebrows, eyelids, eye pan and tilt, and slightly larger ones for the face actuation of pan, tilt and roll.