BS EN ISO 10360-5-2020 Geometrical product specifications (GPS) – Acceptance and reverification tests for coordinate measuring systems (CMS) Part 5: Coordinate measuring machines (CMMs) using single and multiple stylus contacting probing systems using discrete point and/ or scanning measuring mode

BS EN ISO 10360-5-2020 Geometrical product specifications (GPS) – Acceptance and reverification tests for coordinate measuring systems (CMS) Part 5: Coordinate measuring machines (CMMs) using single and multiple stylus contacting probing systems using discrete point and/ or scanning measuring mode. The single-stylus, multi-stylus, opposing-styli and scanning mode errors and their corresponding maximum permissible errors shall be expressed in micrometres. For each test specified in Clause 6 the same data set shall be used to evaluate both size and form as requested. It is not permitted to take two data sets, one for size and one for form. For articulating systems, data for at least one method of qualification, either inferred or empirical, is required. NOTE 1 The single-stylus probing error also applies to CMMs used with fixed multiple probes, fixed multiple styli and articulating probing systems (see 6.3.1). NOTE 2 Multi-stylus probing performance is broadly categorized into form-related (PForm.Sph.5×25:j;Tact), size-related (Psize.Spli.5×25:j:Tacj, and location-related (LDja.5×25:j:Tact and LDIa.proj.Sph.2×25:j:Tact) errors. Different combinations of these will be important for the uncertainty of the different measurement tasks. For example, the form and size results might contain information on the ability of the CMM system to use multiple stylus tip diameters in the measurement of a single geometrical feature wherej is replaced by MS, MP, Emp, or ml, as applicable. See also Annex C. NOTE 3 An articulating probing system used at multiple angular positions, even when used with a single stylus, is deemed to be a multi-stylus probing system. NOTE 4 The limits of the probing system configuration for the single-stylus, scanning mode test and the multi- stylus test are allowed to differ from each other. 6.2 Measuring equipment 6.2.1 Test sphere For both single-stylus and multi-stylus tests in this document, the test sphere shall have a diameter not less than 10 mm and not greater than 51 mm. For the scanning mode test, the test sphere shall have a diameter not less than 24,9 mm and not greater than 25,5 mm. The test sphere shall be calibrated for size and form. For the tests in this document, the measurand for sphere size is the least-squares diameter and the measurand for sphere form is sphericity. Calibration organisations use different approaches for sphericity. Common approaches for sphericity are for example: a minimum of 3 orthogonal great circle traces; or using 25 or more points well distributed on the sphere. For size, common approaches are for example:...