International Journal for Quality Research

5

Authors: M. Badida, E. Lumnitzer, M. Bilova, M. Filo

Identification of the noise measuring uncertainties by declared measured values is unconditionally necessary and required by legislative. Uncertainty of the measurements expresses all errors that accrue during the measuring. B y indication of uncertainties the measurer documents that the objective value is with certain probability found in the interval that is bounded by the measurement uncertainty. The paper deals with the methodology of the uncertainty calculation by noise measurements in living and working environments. metal processing industry and building materials industry.

6

Authors: N. Miric, G. Devedzic

The term Lean has been widely used in today's product manufacturing and service delivery environments. In its fundamental nature the Lean Philosophy continuously strives for elimination of any kind of waste that exists in such environments. There are six basic strategies [1] related to the Lean Philoso phy: Workplace Safety & Order & Cleanliness, JIT production, Six Sigma Quality, Empowered Teams, Visual Management and Pursuit of Perfection. On the journey of sustaining the lean supporting strategies there are many problems, or opportunities as Lean Prac titioners call them. The value of some strategies highly depends on the efficiency of the problem solving techniques used to overcome the emerging issues. JIT production is difficult to imagine without a system that supports a high level of operational rea diness with equipment uptime above 98%. Six Sigma level of quality, even when built into a product or system design, still undergoes the challenges of day to day operations and the variability brought with it. This variability is the source of waste and lean systems culture strives for continuous reduction of it. Empowered Teams properly trained to recognize the real cause of the problems and their Pursuit of Perfection culture are one of the corner stones of Lean Philosophy sustainability. Their ability to work with Problem Solvers and understand the difference between the "cure of the symptoms" approach versus "problem root cause identification" is one of the distinctions between Lean and Mass operations. Among the series of Statistical Engineering To ols this paper will show one of the techniques that proved to be powerful in the identification of the Set of Variation that contains the Main Cause of the new problems that arise in daily operations. This technique is called Multi - Vari. Multi - Vari is th e statistical engineering method used to analyze the set of data acquired in an organized manner. The set could be analyzed graphically or analytically. There are two basic applications of this method: (1) Determine statistically the homogeneity of the data distribution [2] and (2)Identify the critical set of variation that contains the assignable cause of the variation. This paper will focus on the second application of this method which gives the greatest return on investment in day to day operations in d ifferent working environments. Presented vision of the Multi - Vari method and application example should help readers to understand the essence, evaluate the value of this method and identify a potential for application in their areas of expertise.

7

Authors: L. SooS, I. Onderova

At present there is a permanently increasing demand from machine-tool users for metalworking and fabrication machines for high speed cutting (HSC), which are the basic trend of the intensification of processes that means shortening of cycle time s. The progress in building and applications of a new generation of machines was enabled by new cutting materials and tools, high revolution spindles, sophisticated types of leading, linear drives, etc. Actually, this progress is remarkable when it comes to the increase of the output of energy beam sources (laser, plasma, water beam) in the machines for cutting of material. That also increases demands for highly effective, high dynamic technological tabl es that create the support for cutting heads, while the demands for the quickness of these tables are extremely hi gh with speeds up to 300 m/min.

8

Authors: S. Arsovski, K. K. Milovanovic

The basic subject of this work is the model of new approach impact on quality and safety products, and competency of our companies. This work represents real hypothesis on the basis of expert's experiences, in regard to that the infrastructure with using new approach directives wasn't examined until now, it isn't known which pro duct or industry of Serbia is related to directives of the new approach and CE mark, and it is not known which are effects of the use of the CE mark. This work should indicate existing quality reserves and product's safety, the level of possible competency improvement and increasing the profit by discharging new approach directive requires.

14

Authors: Z. Arsovski, M. Pavlovic, S. Arsovski

In essence, process of maintaining equipment is a support process, because it indirectly contributes to operational ability of the production process necessary for the supply chain of the new value. Taking into account increased levels of automatization and quality, this proces s becomes more and more significant and for some branches of industry, even crucial. Due to the fact that the quality of the entire process is more and more dependent on the maintenance process, these processes must be carefully designed and effectively im plemented. There are various techniques and approaches at our disposal, such as technical, logistical and intensive application of the information - communication technologies. This last approach is presented in this work. It begins with organizational goa ls, especially quality objectives. Then, maintenance processes and integrated information system structures are defined. Maintenance process quality and improvement processes are defined using a set of performances, with a special emphasis placed on effectiveness and quality economics. At the end of the work, information system for improving maintenance economics is structured. Besides theoretical analysis, work also presents results authors obtained analyzing food industry, metal processing industry an d building materials industry.