Verification of the CMM Measuring Path Based on the Modified Hammersly's Algorithm

Abstract

This paper presents a CAI verification of the measuring path for inspection of prismatic measuring parts (PMP) which consists of the basic geometric features. The aim of the verification is to visualize collision check between the measuring sensor and the workpiece. The simulation of the measuring path was realized on the configured virtual CMM in the CAD environment. The generated measuring path for inspection planning at the CMM consists of three sets of points. The first set of points, measuring points, is generated based on the modified Hammersly's algorithm for distribution of measuring points by the features from which the workpiece consists. The other two sets, nodal points, are collision fee points, which are generated on the basis of the developed model that analyze accessibility to features at the level of one feature and based on the principle of collision avoidance when pass from one feature to another (requirement of tolerance). On the basis of these three sets of points, the total measuring path without collision is generated. The measuring path generated in this way is verified by simulations on a configured virtual CMM through several examples of standard forms of tolerance.