Wie ist das denn mit den Drehwinkeln?
120° erscheint mir etwas wenig.
Manfred

http://www.seattlerobotics.org/guide/servos.html
The output shaft of the servo is capable of travelling somewhere around 180 degrees. Usually, its somewhere in the 210 degree range, but it varies by manufacturer. A normal servo is used to control an angular motion of between 0 and 180 degrees.