Abstract: On the basis of analyzing the original errors in a screw machining system, the mathematical model between travel deviation and original errors is proposed. The measurement principle of the error relativity and error separation is described. Multiple layer error separate processing of original errors in the system is discussed, for which we use work piece screw as a test component and a microcomputer as a data processor.A example is given in this paper.

Key words: Axial velocity, Instantaneous vortex, Large structure vortex ring, Pulse rate, Self-excited oscillation chamber