We have developed a compact high-precision rotary stage for use in ult
rahigh vacuum. Its drive mechanism incorporates along its circumferenc
e two sets of diametrically opposed piezoelectric devices with combine
d clamping and pushing action. The maximum torque load is 0.7 Nm. The
rotation is bidirectional over 360 degrees and proceeds in steps down
to 1 mdeg at a maximum speed of one revolution per 2 min. (C) 1996 Ame
rican Institute of Physics.