Through sintering a typical axisymmetric object,the influence of laser power,heating-up temperature and section thickness in SLS on the shape and position tolerance and the errors of diameter and cylindricity is studied in detail.

The mathematical models are established for estimation of cylindricity error.

The space datum line gained in minimum second multiplication or other existing arithmetic fit have practical significance in evaluation of the cylindricity error.

Introduces the technique of virtual instrument and the software development platform LabWindows/CVI and discusses the basic principles and mathematical models for developing the cylindricity error virtual measuring instrument with the sampling technique involved.

According to the characteristics of cylindricity error evaluation, the computation methods of objective functions' mathematic model is established when adopting Minimum Zone Cylinder (MZC), The Least square Cylinder (LSC), Minimum Circumscribed Cylinder (MCC) and Maximum Inscribed Cylinder (MIC) to evaluate cylindricity error in Matlab.

The effect of measurement cylinders diameters on the measuring result of the gears M Value is analysed.

Research on the Distribution of the Fitting Nodes for Roundness Error Based on CMM;

Research on the measurement of roundness error with least fitting nodes;

Fast-accurate algorithm based on roundness error and its realization by software;