One of the main directions of creation of the new Russian Standards in the field of mechanical motion quantities is designing complex standard which permits to reproduce a group of mechanical values. The new standard contains three Standard setups. The first one intended for constant linear acceleration reproduction is based on the method of being tested device inclination in the Earth gravitational field. In this case a surface of free liquid is chosen as local horizontal plane. The second one is the double centrifuge working in three modes and reproducing constant and variable linear...
KEBA - Sawmill-Automation and the Microelectronics Institute of the Johannes Kepler University of Linz developed a new low-cost-system for measuring the diameter of a log with mm resolution. The system utilizes two laser beams forming an angle of 90°. Each of them is scanned by a rotating polygon mirror towards a retroreflector located in a distance of about 2 meters. Each retro-reflected laser beam is detected by a large-area photo diode mounted near the polygon mirror. An object (log) hit by the scanning laser beams produces for a certain time a shadow on the two reflectors and, hence, on...
In this paper, there are presented some preliminary image processing methods. They are applied in the vision system for the automatic measurement of the surface tension and wetting angle in solid-liquid systems over a wide range of temperatures. The properly-selected image processing algorithms yielded the results of accuracy and repeatability not yet obtained in any classical methods.
Measurement systems based on optical principles, laser scanning and CCD cameras are able to acquire dimensional data in a non contact and very fast manner. This paper covers the individual measuring principles, the measuring result and their use in industrial applications (case studies) of the ATOS digitizing system and the TRITOP photogrammetry system.
Influence of temperature on CMM inspection results by means of ballplate or hole–plate is presented. Errors of indication of a CMM for length measurement are analyzed. Internal (by machine hardware and software) and external (by additional temperature sensors and software) methods of compensation are compared with measurement without compensation. Implications for industrial practice are formulated.
The objective of this work is to demonstrate how the single hidden layer Multilayer Perceptron (MLP) neural network could be used to model a typical NC turning process. The Network configuration was decided after performing many trials, and then a generalized MLP neural network with a single hidden layer was used to establish the process model with the available experimental data. The neural network was then used to predict the diameter error and the cutting force for different operating conditions and the testing process was conducted. From the results obtained it was found that the...
A new method of large-angle measurements is described. Its high accuracy results from averaging some thousands of readings of about hundred replicas of the measured angle. An optoelectronic device based on this method has been developed, produced, tested, and applied. The design and operation of the device is described. The device consists of optical grating scales of the regular accuracy. It results in simplification of the structure of the measuring device and increases its reliability. A calibration of the pilot batch of the device shows that its limit error is in the range of 0.5 arcsec....
Today’s global competition causes increased demands on production processes. Workpieces with more and more complex shapes, which are toleranced very sharply, must be manufactured with a high time and cost pressure and have to fulfil highest demands on quality. That is why manufacturing processes must be optimized continuously and controlled reliably. These requirements cause new tasks and challenges for manufacturing metrology, which has to supply the needed information for optimizing manufacturing processes. Within this paper, an approach is given to fulfil the actual and the future demands...
Forming tools are often used to manufacture freeform surfaces. In free forming, the geometry of the workpiece is fully or partially determined by that of the tool (e.g. forming die). Therefore the quality of the finished product largely depends on the geometry of the tools. Tool geometry, though, is changed in the course of the manufacturing process. Reasons are wear e.g. caused by friction and optimisations carried out manually during tryout. When it is time for repair or manufacture of new tools, there is no record of these geometrical modifications applied to the tools. A model in the...
Single point detection has established itself in the past for the measurement of geometrical features with tactile coordinate measuring machines (CMM). Ongoing development in the field of control engineering has led to the socalled scanning technique as an alternative. Unlike single point detection, this technique allows measuring tasks to be accomplished with coordinate measuring machines which were previously restricted to dedicated measuring instruments. This article presents selective test results for the use of the scanning technology for size and form testing with coordinate measuring...