I'm working on building a low-cost precision 3 axis stage actuated by small digital RC servos. It seems that the digital servos I'm using (JR DS368's) don't run smoothly between steps. Even when I drive them with a 32 bit PWM controller, the motion appears choppy, and this choppiness is effectively transmitted directly to the stage (current implementation has no damping built in).
My question is, is this jitter/choppiness simply inherent in digital servos because of the fast response time, or is there some way to mitigate it? Has anyone seen a digital RC servo that runs as smoothly as an analog servo? The reason for choosing the DS368 is the high resolution (at relatively low cost) - approximately 5900 steps over 120 degrees.
Thanks, Aaron