Validation Of CMM Form And Tolerance Assessment Software
Author(s)
M.G. Cox, M.P. Dainton, A.B. Forbes & P.M. Harris
Abstract
Validation of CMM form and tolerance
assessment software
M.G. Cox, M.P. Dainton, A.B. Forbes & P.M. Harris
Certfre /or Ma^ema^cs oW
National Physical Laboratory, UK
Abstract
While the verification of the performance of coordinate measuring machines
(CMMs) is self-evidently important, the point coordinates they provide are
usually the input to form and tolerance assessment software that calculate
associated geometric features, such as a best fit cylinder to the data. For
the measurement result to be reliable, it is also necessary to ensure that the
calculations performed by this software are fit for purpose. The forthcoming
standard ISO 10360-6:2001 [1] specifies the procedure by which Gaussian
(least-squares) form assessment software should be tested.
Many tolerance assessment problems relate to Chebyshev (minimum-
zone) fitting criteria in which the maximum error is minimized. These
criteria lead to nonlinearly constrained optimization problems that are dif-
ficult to solve rel
Keywords
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