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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Emise prašnosti při broušení tepelně modifikovaného buku
 Železný, Antonín
The thesis is focused on wood dust generated during sanding modified beech. The analysis concerns the characteristics and composition of this dust. The thesis addresses also the danger for human health exposed to the wood dust and its impact on the work environment. The theoretical part is focused on properties and biological effects of airborne dust on the human body as well as the thermal modification of wood. The experimental part was carried out on a test stand to simulate standard sanding. For our experiment three samples were selected, namely a modified beech at 180 °C, 200 °C and a native beech. In order to evaluate the incidence of wood dust, a methodology was designed to determine the representation of individual fractions of wood particles. Very fine particles (particles smaller than 100 micrometres) were subjected to microscopic and probabilistic analysis.
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Použití speciálních kotoučů u rozmítacích pil
 Železný, Antonín
Circular saw blades are the most common woodworking tools in wood practice. This thesis describes the mechanical instability of saw blades and consequently their noise. When modificating saw blades it is possible to avoid partially these problems and achieve the maximum cutting quality and productivity. The thesis also examines the impact of the noise on human body and proposes measures designed to reduce noise of the saw blades. In the experimental part of the study we are solving the impact of the speed, the type of gearing, feed speed and type of wood swept noise level and frequency of the disc wheels oscillation.
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