Re: [CAD_CAM_EDM_DRO] Re: servo driver on a chip ?

> This is called an RC-servo. They are generally plastic boxes with an
> actuator arm that is driven by a geared DC motor. They are open
> loop and do not include position feedback within the control loop.
> The units were initially used in RC-remote controlled aircraft, cars
> and other models, and are now finding many uses in robotics.
>

huh ? normal RC-servos are most definitely closed loop - there's a
potentiometer that measures where the arm is and the difference between
the measurement and the command is used to drive the motor.
Newer RC-servos use digital feedback loops and are very accurate and strong.