Evaluation of accuracy and reproducibility of the optical measuring system in cast machine tool body assessment

Abstract

The hereby presented study puts forth the fundamentals of an innovative technology enabling rapid assessment of machine tool cast shape by elimination of manual marking out requirement and machining surplus minimization. The new technique is based on optical measuring system utilization for the design of virtual cast models and their comparative analysis with structural models. Two small scale machine tool body casts were selected for the investigation. The measurements were conducted in triplicate series for each cast labeled with reference markers, by means of Atos GOM II optical scanner. For further comparison, one of the casts was additionally scanned without labeling. Flatness parameters of selected cast surfaces were determined for geometric accuracy evaluation and the scanned cast shapes were compared with reference models. The comparison results were recorded as multicolored maps projected upon the experimental cast and reference model surfaces. Practical map interpretation was further elucidated and the surplus sizes on the machined surfaces were assessed accordingly. Comparative analyses of individual models were demonstrated for all measurement series of both casts, affording reproducibility evaluation of optical scanning system measurements. Economic viability of the proposed technology market implementation was unequivocally established, as it provides for considerable reduction in the cast machining scale as well as the quality control of 100%.

Dimensional Accuracy of Parts Manufactured by 3D Printing for Interaction in Virtual Reality

“…To make it more realistic, the physical objects were 3D scanned using the ATOS I optical scanner by the GOM company, with measure-ment field of 125 x 125 mm. Three-dimensional scanning ensures rapid time of measurement and its result is a point cloud [6]. The initial head was re-created from the 3D scan and the modified models were prepared directly in the CATIA v5 CAD system, on the basis of 3D scans.…”

Algorithms for Measurement of Bended Elements by Means of Measuring Arms Equipped with Contactless Probes

“…The optical measurements have many advantages comparing to conventional contact measurements [1]. The measuring arms used for the measurement of the bended elements (eg.…”

Influence of Marker Arrangement on Positioning Accuracy of Objects in a Virtual Environment

“…The data are analyzed by the 3D scanner software and in a short time, a point cloud is generated out of each scan. Such a method of obtaining data is sufficient from the viewpoint of required dimensional and shape accuracy [13], but would be not available for use in the real time tracking due to complexity of calculation algorithms. A result of the measurement was a digital model in a form of a triangular mesh (generated automatically on the basis of the point cloud).…”