BS EN ISO 10360-3:2001 pdf – Geometrical Products Specifications (GPS) — Acceptance and reverification tests for coordinate measuring machines (CMM) — Part 3: CMMs with the axis of a rotary table as the fourth axis.
1 Scope This part of ISO 1 0360 specifies the acceptance test which verifies that the performance of four-axis coordinate measuring machines (CMM) is in accordance with that stated by the manufacturer. It also specifies the reverification test, which enables the user to reverify the performance of a four-axis CMM periodically. The acceptance test and reverification test described in this part of ISO 1 0360 are applicable only to four-axis machines with three axes for measuring workpiece coordinates, plus a rotary table for orienting the workpiece. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 1 0360. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 1 0360 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1 0360-1 :— 1 ) , Geometrical Product Specifications (GPS) — Acceptance and reverification tests for coordinate measuring machines (CMM) — Part 1 : Vocabulary. ISO 1 4253-1 :1 998, Geometrical Product Specifications (GPS) — Inspection by measurement of workpieces and measuring equipment — Part 1 : Decision rules for proving conformance or non-conformance with specifications. International Vocabulary of Basic and General Terms in Metrology (VIM) . BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML, 2nd edition, 1 993. 3 Terms and definitions For the purposes of this part of ISO 1 0360, the terms and definitions given in ISO 1 0360-1 , ISO 1 4253-1 and VIM apply.
4 Requirements for metrological characteristics 4.1 Error of indication The errors of indication, FR, FT, FA, as defined in ISO 1 0360-1 , for the three four-axis errors shall not exceed the maximum permissible errors, MPE FR , MPE FT , MPE FA , as defined in ISO 1 0360-1 , as stated by: ? the manufacturer, in case of acceptance tests; ? the user, in case of reverification tests. The errors of indication (FR, FT, FA) and the maximum permissible errors (MPE FR , MPE FT , MPE FA ) are expressed in micrometres. 4.2 Environmental conditions Limits to be respected for permissible environmental conditions such as temperature conditions, air humidity and vibration at the site of installation that influence the measurements shall be specified by: ? the manufacturer, in case of acceptance tests; ? the user, in case of reverification tests. In both cases, the user is free to choose the conditions within the specified limits. 4.3 Rotary table The maximum permissible errors (MPE FR , MPE FT , MPE FA ) apply for any permitted loading, location and orientation of the rotary table on the CMM and for any locations of the test spheres on the rotary table within specified limits. 4.4 Stylus system Limits to be respected for the stylus system configuration, to which the stated values of MPE FR , MPE FT , MPE FA apply, shall be specified by: ? the manufacturer, in case of acceptance tests; ? the user, in case of reverification tests. In both cases, the user is free to choose the stylus system configuration within the specified limits. The form deviation of the stylus tip will influence the measurement results and shall be considered when proving conformance or non-conformance with specifications.
5 Acceptance test and reverification test 5.1 Principles The principle of the assessment method is to establish whether the CMM is capable of measuring within the stated maximum permissible errors (MPE FR , MPE FT , MPE FA ) by determining the variation of the measured coordinates of the centres of two test spheres mounted on the rotary table. It is noted that on a perfect four-axis CMM, the location of the measured centres of the test spheres would remain fixed in the workpiece coordinate system while the table is rotated. Each test sphere centre is determined in three directions: radial, tangential and axial. The position of each test sphere centre is represented in the workpiece coordinate system on a rotary table. The centre of each test sphere, mounted on a rotary table, is measured in a series of measurements with different angular positions of the rotary table. The errors of indication (FR, FT, FA) are calculated separately for each test sphere as the range between the maximum and minimum measurement results for each of the three directions. In the following: ? acceptance tests are executed according to the manufacturer’s specifications and procedures; ? reverification tests are executed according to the user’s specifications and the manufacturer’s procedures.