scope:

This Standard establishes requirements and methods for specifying and testing the performance of CNC machining centers. In addition to clarifying the performance evaluation of machining centers, this Standard seeks to facilitate performance comparisons between machines by unifying terminology, general machine classification, and the treatment of environmental effects. The Standard attempts to define testing methods capable of yielding adequate performance results for the majority of machining centers and is not intended to replace more complete tests. It is not the intent of this Standard to place limits on or to enforce 100 percent testing of any individual machine tool in accordance with this Standard. This shall be the subject of contractual agreement between the supplier and the user.

This Standard relies heavily on previous work that has been done on accuracy specifications of machines and gages as described in ASME B89.1.12M-1990, "Methods for Performance Evaluation of Coordinate Measuring Machines"; ANSI/ASME B89.3.4M-1985, "Axis of Rotation"; and ANSI/ASME B89.6.2-1973 (R1979), "Temperature and Humidity Environment for Dimensional Measurement." Although the procedures described herein provide checks of most of the parameters that are relevant to machining centers, it is not intended to replace more complete tests if required for a particular application.