Assessment of flatness error by regression analysis

The geometric tolerancing (GPS or GD&T) has increasing importance in machine design, manufacturing and measuring. The geometric tolerances define the deviation of the different kinds of geometric elements in more sophisticated way, than dimensional tolerances. Nevertheless, the application of them requires more wariness in design process, manufacturing process planning and measuring. The key element is the measuring, when the requirements have to be inspected according to the standards, and striving to the maximal productivity and accuracy. The paper presents a new method to evaluate the flatness deviation by limited number of measured points and it uses regression analysis based on partial point sets. The method considers the observation, than the number of measured points increases the evaluated flatness values. The article presents the new method, the results of test, which support it and the result of verification tests also.