ASME B89.4.22:2004 pdf download Methods for Performance Evaluation of Articulated Arm Coordinate Measuring Machines
1 SCOPE
The scope of this Standard pertains to the perform-ance evaluation of articulated arm coordinate measur-ing machines. While any number of rotational joints canbe evaluated, the Standard focuses on the more com-mon configurations commercially available today andis limited to seven joints. The Standard addresses purelymanual machines, so no motorized axes are addressedin the current document. While the application of thisclass of measuring machine continues to grow, at thispoint in time only contact probes are considered and optical noncontact probes are specifically excluded.This Standard establishes requirements and methodsfor specifying and testing the performance of AACMMs.In addition to clarifying the performance evaluation ofAACMMs, this Standard seeks to facilitate performancecomparisons among machines by unifying terminologygeneral machine classification, the treatment of envi-ronmental effects, and data analysis. This Standard at-tempts to define the simplest testing methods capableof yielding adequate results for most AACMMs and itis not intended to replace more complete tests that maybe suitable for special applications.
This Standard provides definitions of terms applicable to AACMMs. These definitions are separated intotwo parts. The first part is a glossary covering technicalterms used throughout this and other ASME Standards.The second part defines a number of common machineclassifications.
The actual specification is subdivided into threesections: general machine classification, machine envi-ronmental requirements,and machine performanceMachine classification includes machine type, measure ment ranges and rotary axis encoder resolution. Environmental specification includes thermalresponse, electrical requirements, and vibration sensitivity. Machineperformance specification includes effective diametertest, single-point articulation performance, and volumetric performance tests.
Within this Standard, performance values are reportedas the maximum deviation, the range, and the standarddeviation This is done to bring the Standard more into linewith existing national and international standards.
In order to clarify the use of this Standard, a shortguide on how to use it is included as Appendix A.Productivity is an important consideration in the selection of an articulated arm coordinate measuring machine. There are numerous factors that affect the relative productivity of measuring systems, which includevariables attributable to both the measurement systemand the workpiece. This Standard does not addressmethods to specify and evaluate productivity. Productivity should be evaluated with respect to the expecteduse of the system, including such aspects as software.ergonomics, and the frequency of calibration.
1.1 Contents and Specification Forms
Any specification described as complying with this Standard shall include, as a minimum, the following items:(a) a machine classification form (see Fig. 1).If noclassification is applicable, the actual configuration shallbe described in equivalent detail.
(b) an environmental specification form (see Fig.2)(c) a performance specification form (see Fig. 3).
1.2 Alternatives
This Standard allows parts of the environmental testsection to be deferred or bypassed and only the per-formance tests to be carried out. This alternative is acceptable only if it is agreeable to both the user and thesupplier, and if deferred as specified.