New geometry and technology of face-gear forming with circle line of teeth on CNC milling machine

Different types of geometric models of face-gear with circle line of teeth have been shown in the paper. Generation of a new geometrical of a face-gear is performed on CNC milling machine. The basic direction of the development geometrical of a face-gear and technology is in the search of new trends and methods focused on improving the quality of products, shortening the production cycles, their mechanizations, automation and implementation of a high-precision technology

Nova geometrija i tehnologija oblikovanja hipoidnih zupčanika na CNC glodalici

Different types of geometric models of face-gear with circle line of teeth have been shown in the paper. Generation of a new geometrical of a face-gear is performed on CNC milling machine. The basic direction of the development geometrical of a face-gear and technology is in the search of new trends and methods focused on improving the quality of products, shortening the production cycles, their mechanizations, automation and implementation of a high-precision technology.Različiti tipovi geometrijskih modela hipoidnih zupčanika su prikazani u radu. Izrada novog geometrijskog oblika zupčanika je provedena na CNC glodalici. Temeljni smjer razvoja geometrijskih oblika zupčanika i tehnologije izrade je u traženju novih trendova i metoda za unaprjeđenje kvalitete proizvoda, skraćenja trajanja proizvodnog ciklusa, njegova mehanizacija, automatizacija iimplementacija visokoprecizne tehnologije

Factors affecting the level of damage by wild boar in farmlands in north-eastern Poland

Frąckowiak, W., Gorczyca, S., Merta, D., Wojciuch-Płoskonka, M

Wild boar population at the Vistula Spit – management of the species in forested and urban areas

Bobek, B., Frąckowiak, W., Furtek, J., Merta, D., Orłowska, L

Reproductive parameters, birth date-effect and body condition of wild boars (Sus scrofa) inhabiting forest and forest-farmland environments in Poland

Merta, D., Albrycht, M., Frąckowiak, W., Furtek, J., Mamok, T

Mjerenje ravnosti dugačkih strojnih vodilica

This paper shows the guideway types of large machines and describes problems with their straightness measurement. A short description of straightness measurement methods and the results of investigation in straightness of 10 meter long guideways of a CNC machine by means of the XL-10 Renishaw interferometer are also presented.Rad prikazuje tipove vodilica velikih strojeva i opisuje probleme mjerenja njihove ravnosti. Dat je također i opis metoda mjerenja ravnosti, te rezultati ispitivanja ravnosti 10 metarskih vodilica CNC stroja pomoću XJ-10 Renishawovog interferometra

Influence of environmental, ergonomic factors and properties of operators on the reliability of ships propulsion systems

Analyzing the systems in terms of reliability, we often treat them as the technical objects only, omitting human interaction or assuming that operator has constant characteristics. This significantly distorts the results obtained in this way, since human is a part of the system with special properties that can change together with the predisposition of the operator and the conditions under which he operates. These attributes may have a major influence on the reliability of the systems. Therefore, analysis of systems reliability should include a reliability of operator and its properties. In this paper presented the antropotechnical reliability structure based on selected installation, which is a part of ships propulsion system. Also operator’s functions were defined and the analysis of human reliability, taking into account various properties of the operator and the external conditions, were performed. Then, there is assessed the influence of operator and environmental factors on the value of the entire system reliability. The study used the reliability data of the container ship propulsion system equipped with low-speed piston engine, fixed pitch propeller and auxiliary installations. These data were obtained from studies of expert judgments (Brandowski A., Frąckowiak W. et al.) in the years 2007–2009. For HRA (human reliability analysis), HEART technique (Human Error Assessment and Reduction Technique) was used, together with the human unreliability values and correction factors developed by the authors of this method. Study results illustrate influence of environmental, ergonomic factors and the properties of the operator on the reliability of the antropotechnical systems. The studies were subjected exemplification on fuel treatment installation as a part of ships propulsion systems

The effect of initial crushing of grain in the process of the production of oil from the seed of Camelina sativa L.

Lnianka siewna (Camelina sativa L. jest drobnoziarnistą rośliną oleistą. Mała średnica jej nasion stanowi duże utrudnienie przy wytłaczaniu z nich oleju najczęściej spotykanymi prasami ślimakowymi. Wychodząc naprzeciw temu problemowi w Przemysłowym Instytucie Maszyn Rolniczych w Poznaniu we współpracy z Uniwersytetem Przyrodniczym w Poznaniu, opracowano konstrukcję zestawu urządzeń przeznaczonych do wytłaczania oleju z nasion lnianki siewnej i innych oleistych roślin drobnoziarnistych. Przedstawiono porównawcze wyniki badań wytłaczania oleju z całych i zgniecionych nasion lnianki siewnej.Camelina sativa is a fine-grained oleaginous plant. The small diameter of the seeds, is a big problem for the extrusion of oil by most often used screw presses. To so the this problem the Industrial Institute of Agricultural Engineering in Poznań in cooperation with the Poznań University of Life Sciences, worked out a new construction of the devices designed for the oil embossing from Camelina sativa seeds and other fine-grained oleaginous plants. This paper presents the comparative test data of oil extruding from not crushed and crushed seeds of Camelina sativa L

Influence of extrusion parameters of the screw press prototype on the quality of Camelina seed oil and marc

Lnianka siewna (Camelina sativa L.) jest drobnoziarnistą rośliną oleistą. Mała średnica jej nasion, stanowi duże utrudnienie przy wytłaczaniu z nich oleju najczęściej spotykanymi prasami ślimakowymi. Wychodząc naprzeciw temu problemowi Przemysłowy Instytut Maszyn Rolniczych w Poznaniu we współpracy z Uniwersytetem Przyrodniczym w Poznaniu, opracował konstrukcję zestawu urządzeń przeznaczonych do wytłaczania oleju z nasion lnianki siewnej i innych oleistych roślin drobnoziarnistych. W pracy przedstawiono porównawcze wyniki badań procesu wytłaczania i jakości oleju oraz wytłoków z nasion lnianki siewnej.Camelina sativa is a fine-grained oil plant. The small diameter of the seeds causes real troubles with oil extrusion by most often met screw presses. To get off this problem, the Industrial Institute of Agricultural Engineering in Poznań in cooperation with the Poznań University of Life Sciences worked out the construction of the set of devices designed for the optimum oil embossing from Camelina seeds and other fine-grained oil plants. The paper presents comparative results of the extrusion process and quality of camelina seed oil and marc