IS 15635 : Part 6 : 2006 /ISO 10360-6 : 2001 Geometrical Product Specifications (GPS) - Acceptance and Reverification Tests for Coordinate Measuring Machines (CMM) - Part 6 : Estimation of Errors in Computing Gaussian Associated Features

National Foreword

This Indian Standard (Part 6) which is identical with ISO 10360-6 : 2001 Geometrical product Specifications (GPS) - Acceptance and reverification tests for coordinate measuring machines (CMM) - Part 6: Estimation of errors in computing Gaussian associated features issued by the international Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards onthe recommendation of the Engineering Metrology Sectional Committee and approval of the Medical Instruments, General and Production Engineering Division Council.

Coordinate measuring machines (CMMS) are most modern method of dimensional inspection. With the advent of numerically controlled machine tools, demand grew for a means to support this equipment with faster first piece inspection and in many cases 100 percent inspection. To fill this gap CMMS weredeveloped by madifying precision layout machines.

The tests defined in this part are concerned with assessing the correctness of the parameters of computed associated features as measured by a coordinate measuring machine (CMM) or other coordinate measuring system. Although different criteria may be used to compute associated features, for example,by minimizing the Euclidean or Chebyshev norm of residuals, this test is applicable for software designed for unconstrained Gaussian (least-squares) features.

In the case of reverification tests of CMMS, the software test of this part usually does not provide new or different information in comparison with that obtained by an acceptable test, since software is supposed to be stable over time. However, a reverification test of the software may be useful following possiblecorruption or alteration of the software under test.

For software already in existence, the evaluation of the performance may not be obtained only by fulfilling the requirements of this part. However, such cases do not necessarily exclude the ability of the software to perform correct computation of measurement.

This part is applicable to software submitted for test in respect of the values it provides for the parameters of an associated feature. The test procedure is based on applying the software under test to reference date sets, and comparing the results obtained with reference results.

The text of this ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words International Standard appear referring to this standard, they should be read as Indian Standard.

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.

In this adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their places are listed below along with their degree of equivalence for the editions indicated: