GB/T 17421.2-2023 Test code for machine tools—Part 2:Determination of accuracy and repeatability of positioning of numerically controlled axes

Scope

This document specifies the method of testing and evaluating the positioning accuracy and repeatability of the axes of CNC machine tools by directly measuring the individual axes of the machine tools. This method is applicable to both linear axes and rotary axes (linear motion and rotary motion).
This document is applicable to type testing, acceptance testing, comparative testing, and regular testing of machine tools, and can also be used for compensation adjustment testing of machine tools.
This document is not applicable to machine tools that need to be tested on several axes simultaneously.
The testing method involves repeated measurements at each position. This document provides definitions and calculation methods for parameters related to the testing. The method of estimating uncertainty is described in Appendix C of ISO/TR 230-9:2005.
Appendix A provides a method for estimating measurement uncertainty.
Appendix B describes a step cycle that can be used optionally. The results of this cycle are not used in the technical documentation related to this document, nor are they used for acceptance, unless there is a special written agreement between the manufacturer/supplier and the machine tool user. For the purpose of machine tool acceptance, using the standard testing cycle described in this document is always the correct choice.
Appendix C provides information related to periodic positioning errors.
Appendix D describes testing using a standard ball array and a step gauge.
Appendix E provides information related to the minimum incremental step size.

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