A STUDY OF BACKLASH ON THE MOTION ACCURACY OF CNC LATHES

In this paper, an analytical solution is reported to explain the exper imentally observed backlash behaviors on the motion accuracy of CNC la thes. It is found that backlash occurs when the feed direction is reve rsed. Due to the imperfect transient response of the driving mechanism , not only the static backlash error but also the dynamic backlash err or is generated on the contouring profile. A simple control strategy i s then developed to reduce the static and dynamic backlash errors. Com putational simulations and experimental results are presented to illus trate the proposed method.