On-line measurement of machine tools straight-going parts motion error

A novel accurate two-probe method in time domain is put forward to measure the straight-going component motion error in machine tools. The non-periodic and non-closing characteristics in the straightness profile error are liable to bring about higher-order harmonic component distortion in measurement result. However, this distortion can be avoided by the new accurate two-probe method in time domain through the algorithm of symmetry continuation, uniformity and least square. The harmonic suppression is analyzed through modern control theory. Both straight-going component motion error in machine tools and the profile error in workpiece that is manufactured on this machine can be measured at the same time, all of are available to diagnose the fault origin of machine tools. The analysis result is proved to be correct.