Theoretical studies and experiment analysis of the time domain symmetrical configuration two-probe method for roundness error

Theoretical studies and experiment analysis of time-domain symmetrical configuration two-probe method are provided in this paper, and the method´s feasibility and error separation´s precision are discussed. Conclusions can be drawn from the results of simulation and experiment that measurement precision and repeat precision of two-probe method is a little higher that of single-probe method. Though radial random errors can not be separated entirely, the measurement theory of symmetrical configuration two-probe method is simple, and the measurement equipments´ precision can be easily ensured. In addition, the data processing can be done directly in time-domain, which is more practicable. Two-probe method is useful in practical measurement. High accuracy can be ensured, especially in the case of measuring the shape errors of big parts with general precision.