[Frank Herrmann] had an interesting idea to turn a geared DC motor into a servo motor assembly ... pins hooked up to the motion controller upstream. The Arduino source for this can be found ...

[Cameron] has been hard at work at a low cost, closed-loop controller for the robotics community that will take a conventional BLDC airplane motor and transform it into a high end servo motor.

Even once the mechanical considerations are addressed, the following are needed: power distribution to all motion controllers power and control wiring for the motion controller, the servo motor, and ...