ISO 10360-6:2001

Overview

ISO 10360-6:2001 is part of the ISO 10360 series on Geometrical Product Specifications (GPS) for acceptance and reverification tests of coordinate measuring machines (CMM). This part specifies a software-only test method to estimate errors in computing Gaussian (least-squares) associated features from coordinate measurements. It covers associated features such as line (2D/3D), plane, circle (2D/3D), sphere, cylinder, cone and torus. The procedure uses synthetic reference data sets (Annex A) and reference parameter values to assess the correctness of computed feature parameters.

Key topics and requirements

• Software scope: Tests apply to the computing software alone and are independent of the CMM hardware. Software must be uniquely identified (e.g., release number).
• Reference data sets: Generated per Annex A to simulate sizes, shapes, orientations, sampling, probing errors and form deviations. Each reference data set and its reference parameter values are intended for one-time use for verification.
• Input/output capability: Software must accept direct input of reference data sets and output test parameter values with adequate numerical precision (see clause 8). For 2D features, if direct 2D input is unavailable, a dummy null z-coordinate may be used.
• Parametrization and conversion: Because suppliers may use different parametrizations, test parameter values may need conversion to match reference parametrization before comparison. Suppliers must provide full parametrization details.
• Initial estimation: If the software requires initial-estimate subsets (for iterative methods), these must be accommodated and documented.
• Limits of applicability: Tests are for complete and non-extremely partial features; cones with very large apex angles are excluded. Software may legitimately fail to produce results for some data sets (e.g., domain limits, non-convergence, runtime errors).
• Units: Reference coordinates use millimetres; location and size parameters in millimetres; angles in radians.

Applications and who uses it

• Metrology laboratories performing acceptance and reverification of CMM software.
• CMM manufacturers and integrators validating measurement software functions independently of hardware.
• Software vendors submitting computing modules for independent verification.
• Quality engineers and inspection specialists who need assurance that associated-feature computations (least-squares/Gaussian fits) are correct before relying on derived size, form, location and orientation parameters for conformity assessment.

Related standards

• ISO 10360-1:2000 (Vocabulary)
• ISO 10360-2:2001 (CMMs used for measuring size)
• ISO 14253-1:1998 (Decision rules for inspection)
• ISO 14660-1 and ISO 14660-2 (Geometrical features)
• International Vocabulary of Metrology (VIM)

Keywords: ISO 10360-6, CMM software testing, Gaussian associated features, coordinate measuring machines, reference data sets, associated feature computation, acceptance tests, reverification tests, metrology software validation.