Precision instrumentation is the key factor in quality assurance in various fields of industry. Precision angle measurements performed by using total stations is a field showing a lot of potential. Horizontal angle measuring system calibration is well documented and researched field however vertical angle measuring system calibration tends to lack proper investigation. This paper deals with the analysis of modern calibration methods of vertical angle measuring systems after which the new arrangement for vertical angle calibration of the total station is presented. The principle of the...
The paper presents a new conception of building probabilistic models of communication delays in wireless networks that basis on using a delta function sequence to describe retransmissions between a transmitter and a receiver. It is assumed that the access time of the transmitter is described by a probability density function and the communication channel established in the wireless medium is disturbed by passive or active factors which cause that the transmission can be not correct and the sent data have to be retransmitted. Theoretical considerations have been verified by measurement...
The subject of the paper is to describe a mechatronic monitoring tool (MMT) used for evaluation of machined surface during the process of cutting. The integral part of mechatronic tool is a smart sensor. The principle of MMT design is a ability to be used on any lathe. The MMT is composed of several functional elements. The core element of mechatronic monitoring tool is the smart sensor, which provides the data acquisition and integration. The basis for the sensor to operate isthe surface image sequence acquired during cutting. The images are pre-processed and characterized with the number...
Proficiency testing is an important way of meeting the requirements of ISO/IEC 17025 in the area of quality assurance of laboratory results. Laboratory for dimensional measuring technique on Mechanical Engineering Faculty participated in comparison of dial gauge and external micrometer. The key requirements of such comparisons are that the samples are same or similar, and also thatthe set of samples measured are appropriate to test and display similarities and differences in results. A proficiency testing scheme is a system for objectively evaluating laboratory results by external means, and...
Quality management decisions require precise and reliable measuring results. In manufacturing and assembling processes, production metrology plays a significant role in generating such results. For this reason, coordinate measuring machines (CMMs) are used more and more often due to their universality and flexibility. The quality of results generated by CMMs is highly dependent on the skills of the CMM operators. In order to minimize technicians' influence, they need to be provided with the necessary knowledge to carry out such tasks. Efforts to introduce training at a national level led to...
Angular relationships of lift and control surfaces, wings and all the elements needed to determine the model for wind tunnel testing are essential to the quality of the final assembly. In relation to the measurement of airfoil shape deviation from this determination is complicated and requires complex mathematical models and calculation. It is necessary to find the plane that represents the wing and calculate the required angular relationships such as the wing setting angle and the dihedral angle. Such a plane exists on the wing and is called the Wing Reference Plane (WRP). This plane is not...
The classic (direct) runout measurement is a function oriented all-over inspection of a bevel gear. Its result is one of the criteria to classify gears in standardised accuracy grades (former quality groups). For several reasons, this direct method is rarely applied for bevel gear inspections, carried out with coordinatemeasuring machines (CMM). Instead, special evaluations based on pitch measurements of both flanks (coast and drive) are commonly used. These calculations relate to much less flank information than the direct measurement and include,depending on the algorithm, several risks....
This report presents a functional diagram of the Ukrainian primary standard of electrolytic conductivity (EC) and construction of primary four electrode conductivity cell with the calculated coupling constant. The equations for calculating the cell constant and budget of errors for calculating uncertainty are presented. The components of budget are: error due to the non-uniformity of the force lines of the electric field; the error due to accuracy of measurement standards and measuring instruments when determining length and diameter of the tube; the error due to manufacturing techniques of...
The objective of this paper is to develop knowledge base model for inspection planning prismatic parts on CMM in digital manufacturing. The digital manufacturing is a novel approach to manufacturing in which all elements of manufacturing process are built using computer based simulation with a 3D visualization. For each element in the process (product/part, tool, fixture, machine, measuring sensor, CMM) a solid model is built and the whole manufacturing process is simulated in order to provide digital verification. Our research model is related to the CMM and its digital environment. The...
Six Sigma improvement projects are increasingly conducted in Brandenburg’s SMEs. A brief overview is given on completed projects. Brandenburg’s SMEs demand for education in this field. The conceptual structure of Six Sigma training concepts in Germany poses a problem for SMEs, due to the lack of flexibility. SME employees have to allow up to 25 days for this training, which often take place far away. The concept presented herein designs individual onsite training for the needs of regional SMEs. The complex educational content is offered in a modular form, based on the individual level of...