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ASME B89.4.22-2004 pdf download

ASME B89.4.22-2004 pdf download.Methods for Performance Evaluation of Articulated Arm Coordinate Measuring Machines.
INTRODUCTION The primary purpose of this Standard is to clarify the performance evaluation of articulated arm coordinate measuring machines (AACMMs). A secondary purpose is to facilitate performance comparisons between ma- chines. Definitions, environmental requirements, and test methods are specified. This Standard defines the test methods capable of yielding adequate results for the ma- jority of articulated arm coordinate measuring machines and is not intended to replace more complete tests that may be required for special applications. 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 can be evaluated, the Standard focuses on the more com- mon configurations commercially available today and is limited to seven joints. The Standard addresses purely manual machines, so no motorized axes are addressed in the current document. While the application of this class of measuring machine continues to grow, at this point in time only contact probes are considered and op- tical noncontact probes are specifically excluded. This Standard establishes requirements and methods for specifying and testing the performance of AACMMs. In addition to clarifying the performance evaluation of AACMMs, this Standard seeks to facilitate performance comparisons among machines by unifying terminology, general machine classification, the treatment of envi- ronmental effects, and data analysis. This Standard at- tempts to define the simplest testing methods capable of yielding adequate results for most AACMMs and it is not intended to replace more complete tests that may be suitable for special applications. This Standard provides definitions of terms applica- ble to AACMMs. These definitions are separated into two parts. The first part is a glossary covering technical terms used throughout this and other ASME Standards. The second part defines a number of common machine classifications. The actual specification is subdivided into three sections: general machine classification, machine envi- ronmental requirements, and machine performance. Machine classification includes machine type, measure- ASME B89.4.22-2004 1 ment ranges, and rotary axis encoder resolution. Envi- ronmental specification includes thermal response, elec- trical requirements, and vibration sensitivity. Machine performance specification includes effective diameter test, single-point articulation performance, and volu- metric performance tests. Within this Standard, performance values are reported as the maximum deviation, the range, and the standard deviation. This is done to bring the Standard more into line with existing national and international standards. In order to clarify the use of this Standard, a short guide on how to use it is included as Appendix A. Productivity is an important consideration in the se- lection of an articulated arm coordinate measuring ma- chine. There are numerous factors that affect the rela- tive productivity of measuring systems, which include variables attributable to both the measurement system and the workpiece. This Standard does not address methods to specify and evaluate productivity. Produc- tivity should be evaluated with respect to the expected use 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 Stan- dard shall include, as a minimum, the following items: (a) a machine classification form (see Fig. 1). If no classification is applicable, the actual configuration shall be 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 test section to be deferred or bypassed and only the per- formance tests to be carried out. This alternative is ac- ceptable only if it is agreeable to both the user and the supplier, and if deferred as specified.

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