Issues, Concepts, and Standard Techniques in Assessing Accuracy of CoordinateMeasuring Machines

摘要

The report deals with a variety of issues, concepts and standard techniques inassessing the accuracy of measurements of modern laser-based computer-controlled coordinate measuring machines. It outlines technical issues in assessing conformity of dimensions of manufactured parts to design tolerances with such CMM's, uses a new system of length-dimensional types (displacement, position, distance and extension) as the basis for an error-budget analysis of CMM measurement capabilities and, based on that system, intercompares U.S., German, British and Japanese CMM performance standards, showing that the U.S. standard provides separate test of a CMM's capability to measure of each length-dimensional type and the part features associated with them.