All the r/c type servos I have are rotational. Do they make a small linear servo that is driven like a r/c servo? JOn In a message dated 9/17/99 11:43:07 AM US Mountain Standard Time, mrjones@NORTELNETWORKS.COM writes: << Linear servo motor? Seriously, if you are expecting some kind of external influence that can disturb the stepper position and you can't re calibrate by moving to a reference position periodically, then some kind of positional feedback is needed. >>