BS ISO 13041-8 pdf download Test conditions for numerically controlled turning machines and turning centres — Part 8: Evaluation of thermal distortions
4.1 Reference to ISO 230-3 To apply this part of ISO 1 3041 , reference shall be made to ISO 230-3, especially for the installation of the machine before testing, description of measuring methods and presentation of the results.
4.2 Testing sequence The tests in this part of ISO 1 3041 may be used either separately or in any combination.
4.3 Tests to be performed When testing a machine, it is not always necessary or possible to carry out all the tests described in this part of ISO 1 3041 . When the tests are required for acceptance purposes, it is up to the user to choose, in agreement with the supplier/manufacturer; those tests relating to the components and/or the properties of the machine which are of interest. These tests are to be clearly stated when ordering a machine. Mere reference to this part of ISO 1 3041 for the acceptance tests, without specifying the tests to be carried out, and without agreement on the relevant expenses, cannot be considered as binding for any contracting party.
5 Environmental Temperature Variation (ETVE) test
5.1 General ETVE tests are designed to reveal the effects of environmental temperature changes on the machine. They shall not be used for machine comparison. It is recommended that the supplier/manufacturer should offer guidelines regarding what kind of thermal environment should be acceptable for the machine to perform with the specified accuracy. It shall be the responsibility of the user to provide an acceptable thermal environment for the operation. However, if the user follows the guidelines provided by the machine supplier/manufacturer, the responsibility for machine performance according to the specification reverts to the machine supplier/manufacturer.
5.2 Test method The test method shall be in accordance with those defined in 5.2 of ISO 230-3. The ETVE test should last for a minimum of 4 h; if the readings of the measuring instruments still show any drift, the test should be continued up to a maximum of 24 h. NOTE Vertical and slant-bed axes might warm up when under NC “HOLD” command. In such cases, it is recommended to execute the ETVE test with all controls “OFF”. This should be stated in the test protocol.
5.3 Measuring instruments The measuring instruments are as follows: linear displacement probe, temperature sensors, test mandrel and data acquisition equipment.
5.4 Presentation of results Table 1 provides an example of the format for the presentation of the results; in addition, a graphical presentation of results should be provided as specified in 5.3 of ISO 230-3:2001 .