By placing appropriate recirculating balls between rail and block, friction between the block and the rail changes from slide friction to rolling friction, the latter is less than the former greatly. then:
a. The difference between dynamic and static friction is small. It benefits to raise responsible speed and sensibility of CNC system.
b. Required driving power could be slowed down greatly, compared to the traditional form, which is only 1/0.
c. Compare to type X-Y cross guide, resistance o friction is only 1/40 of the traditional form.
d. Suitable for high-speed linear motion and instantaneous speed is 10 times that of sliding guide.
e. High positioning accuracy and high repetitive positioning accurcy.