This part of ISO 10791 specifies a method of checking the contouring performance of machining centres (or numerically controlled milling machines, etc., where applicable) by conducting circular tests in the three coordinate planes (XY, YZ and XZ) and by evaluating the radial deviation, F, and circular deviation, G, in accordance with ISO 230-4.
NOTE Measurements of circular movements can be carried out by different methods as described in 6.6 of ISO 230-1:1996. These methods consist of using a rotating one-dimensional probe and a test mandrel, a circular masterpiece and a two-dimensional probe, or a telescoping ball bar. Other test methods may be applied if the accuracy of the equipment is the same as (or better than) the accuracy of the methods described. Influences of typical machine deviations on circular paths are shown in annex B of ISO 230-4:1996.
The purpose of the checks by circular tests described in this part of ISO 10791 is to verify the circular movement
- only in one position per coordinate plane of the machine,
- at only one feed rate, and
- to repeat the test once in the opposite contouring direction.