Tolerance detection method and tolerance detection device for shape measuring apparatus

摘要

When detecting a tolerance of a shape of a measured object having a complicated shape that makes it difficult to perform a continued measurement, a plurality of partial measurement data that are set are retrieved. Next, a reference position is set from first partial measurement data. Then, each of the partial measurement data is combined into one data using the reference position. Further, the tolerance is calculated using the combined data.

主权项

1. A shape detection method to detect a circularity of an object with a circularity measuring apparatus having a stylus that is continuously displaced and spring biased in a predetermined constant direction, the method comprising:
retrieving a plurality of sequential sets of partial measurement data defining corresponding parts of a surface of a circular measured object having circularity, each set of partial measurement data being determined with respect to one or two corresponding reference positions; setting a reference position as one of the corresponding reference positions of a first set of the partial measurement data of the plurality of partial measurement data; copying data from a sequence of the partial measurement data to an index corresponding to a measurement location of a cross sectional data sequence for combining into one cross sectional data; combining each of the sets of the plurality of partial measurement data into one data set using the set reference position and taking account of differences between the set reference position of the first set of partial measurement data and reference positions of other sets of partial measurement data so that the one data set is defined with respect to the set reference position; and calculating a geometric tolerance of the shape of the surface of the measured object using the one cross sectional data, configured by circumferential data based on the combined data set, to obtain the geometric tolerance of a cross section of the measured object at one time.