Vertical Axis Unit

The vertical axis unit consists of vertical axis, sheath axis, horizontal raster disk, low cover etc. This unit enables telescope, alidade and horizontal raster disk to rotate horizontally in a vertical way. Vertical axis unit is a half-athletic cylinder with the following advantages:
a. With the same parameters, sway degree of vertical axis is much smaller than that of standard column axis.
b. Vertical axis unit can center automatically with high accuracy.
c. It rotates flexibly and smoothly with small friction torque and high friction performance.
d. The temperature has little effect on axis and it takes little to grind, which is convenient for batch production. Vertical axis, sheath axis and horizontal raster disk are on the same axis structurally, which must remain unchangeable during rotation and must be vertical to horizontal axis simultaneously.