The method of counting allowances is created by prof. V.M. Kovan more than 40 years ago. Therefore today, when computers are using, the components of allowances it is possible to estimate more deeply and in that way the method of counting of allowances it is possible to make more accurate. The elastic deformations of technological system which appear because of changing of machining material harness and the becoming used up by rubbing of machine tool are estimated in the counting in this case are allowances. How intermediate dimensions are counting in this case is shown.

Tručinskas M. Influence of asymmetry tensioned (compressed) two-layer bars strength and stiffness: Master thesis of mechanical engineer / research advisor Assoc. Prof. habil. Dr. J. Bareišis; Šiauliai University, Technological Faculty, Mechanical Engineering Department. – Šiauliai, 2006. – 47p. Multilayer constructions at this time is very popular, because it is cheaper, we can reduce the weight and the rigidity make similarly. There is investigate asymmetry multilayer constructions, most important setting in parameter and the changes of graph settings and the cross-section of kernel settings. I investigate isosceles angular which was fill in by coal plastic in different forms vertical and horizontal ways. In another way I take one form in vertical and horizontal ways and change the material. In result I get the most important parameter’s change graphs of asymmetry multilayer constructions, set the cross-section of kernel, it form and changes graphs of area.

The goal of research is to investigate rolamite motion supports, their dynamics, to prove possibility of above mentioned mechanism to be controlled precisely and ability to use in everyday practice in field of lifting technics. The object of investigation is rolamite type mechanism, movement of which is controlled by vibrations. As the result of investigation, it was found, that vibration controlled rolamite type motion supports assures smooth, quick and accurate movement of working parts. It is possible to create conditions, which can assure movement of assembly parts with no slipping and no gap between them. It means, that such a mechanisms have the unique precision, which is not possible, using other mechanical drive constructions. Such a precise mechanisms are on demand in most branches of industry. While investigation took place, author tried to find possibilities to use such a mechanisms in lifting technics. It was seen, that these mechanisms are able to use in some assemblies, used in lifts and hoists. Especially interesting is possibility to make vibration controlled brake mechanisms for braking the ropes and sliding block-stops. In this case it is possible to create the self controlling system to prevent lifted weights from falling in case of failure in the electrical mains system. It would be excellent decision for changing the basic system of lifts and winches, used nowadays. These mechanisms will assure security, that still was not reached in nowadays technics.

Juodkūnas Ž. Increasing productivity of mechanical products manufacturing in modern production environment: Master thesis of mechanical engineer/research advisor prof. A.Bargelis; Šiauliai University, Technological Faculty, Mechanical Engineering Department. – Šiauliai, 2006. – 41p. It is generally agreed that the growth of economy is determined by competitiveness of a country (also of a company) on the international scale. To become competitive, a country (a company) must reach at least the same or a higher level of productivity and innovation than other countries of the comparative group. To stay competitive, products should be of high quality and production should be effective and efficient. Only under such conditions an organization can be successful. The purpose of the thesis is to analyze productivity increase in modern production environment. The thesis considers the importance of productivity in contemporary production environment, describes the relation between productivity and quality, factors of productivity realization, provides methods of productivity calculation. Much attention is paid to increasing of design productivity. The advantages of space designing and also the problems of software integration are discussed. Instillation of new technologies is examined. After examination of the theory some conclusions are drawn for reaching high productivity: to put in order structure and management of an organization, to instill modern designing systems (space... [to full text]

E. Janavičius „Surface position errors formation for axel type parts”. Mechanical Engineering Master‘s Theses / Leader ass.prof J.Rimkus; Siauliai University, Chair of mechanical Technology. – Siauliai, 2006 – 31p. The investigation work „Surface position errors formation for axle type parts�� consists of 28 figures, 5 references. Subject of investigation is surface position errors of the parts. Aim of the investigation is formation of surface position errors in manufacturing process. Axel type parts surface position errors formation during treatment, are presented in the work. The surface position error chains are made with a help of graphs. It is hard to estimate what will be the eventual measurement after the part is fully made, because of the errors that appear in the manufacturing process. In this work were analyzed what surface position errors appears and disappears and witch stays after manufacturing process is over. Using graphs and incidentic matrix were analyzed different surface position errors occasions.