BS ISO 13041-2:2020 Test conditions for numerically controlled turning machines and turning centres Part 2: Geometric tests for machines with a vertical workholding spindle.
4.5 Test to be performed
When testing a machine, it is not always necessary or possible to carry out all the tests described in this document. When the tests are required for acceptance purposes, it is up to the user to choose, in agreement with the supplier/manufacturer, the relevant tests relating to the components and/or the properties of the machine. These tests are to be clearly stated when ordering a machine. A simple reference to this document 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.
4.6 Measuring instruments
Measuring instruments indicated in the tests described below are only examples. Other instruments capable of measuring the same quantities and having the same, or a smaller, measurement uncertainty may be used. Reference shall be made to ISO 230-1:2012, Clause 5, that indicates the relationship between measurement uncertainties and the tolerances.
When a dial gauge is referred to, it can mean not only dial test indicators (DTI) but any type of linear displacement sensor such as analogue or digital dial gauges, linear variable differential transformer (LVDTs), linear scale displacement gauges, or non-contact sensors, when applicable to the test concerned.
Similarly, when a straightedge is referred to, it can mean any type of straightness reference artefact, such as a granite or ceramic or steel or cast iron straightedge, one arm of a square, one generating line on a cylindrical square, any straight path on a reference cube, or a special, dedicated artefact manufactured to fit in the T-slots or other references.
In the same way, when a square is mentioned, it can mean any type of squareness reference artefact, such as a granite, ceramic, steel or cast iron square, a cylindrical square, a reference cube, or, again, a special, dedicated artefact.
Valuable information for measuring instruments are available in ISO/TR 230-11.
In this document, for reasons of simplicity, the diagrams associated with geometric tests generally illustrate only one type of turning machine.
4.8 Software compensation
When built-in software facilities are available for compensating certain geometric deviations, their use during these tests for acceptance purposes shall be based on an agreement between the user and the manufacturer/supplier, with due consideration of the machine tool intended use. When software compensation is used, this shall be stated in the test report. It shall be noted that when software compensation is used, axes shall not be locked for test purposes (see ISO/TR 16907).
4.9 Gravity influence for two rail head machines
For machine tools provided with two slides on the cross rail [see Figure 2 and Tablei.. Type B, a) and b)], the rail head not under test shall be in a defined park position according to the manufacturer’s recommendations. If both rail heads are used, the deviations can change due to gravity.
In this document, all tolerance values are recommendations. When they are used for acceptance purposes, other values can be agreed upon between the user and the manufacturer/supplier. The required/agreed tolerance values shall be clearly stated when ordering the machine.BS ISO 13041-2 pdf download.