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Design of a Wood Cutting Machine

Abstract

The price of firewood has increased substantially in the last couple of years due to the high volume of export. The branches and smaller diameter pieces are considered leftovers and are not exportable, however they are suitable as firewood. Chainsaws are used to cut the larger diameter wood, but this way is not efficient for cutting up branches and smaller diameter wood pieces. In this paper we present the structure, working principle and the 3D model of a machine that can be used to chop smaller diameter wood branches in a simple and efficient way.

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Full Dynamic Reactions in the Basic Shaft Bearings of Big Band Saw Machines

References [1] Gochev, G. Handbook for Exercise of Wood Cutting and Woodworking Tools, Sofia, Publishing House in LTU, 2005 (in Bulgarian). [2] Filipov, G. Woodworking Machines, Sofia, Technics, 1977 (in Bulgarian). [3] Genchev, G., P. Obreshkov. Projection and Trial ofWoodworkingMachines, Sofia, 1998 (in Bulgarian). [4] Makovskij, N. V. Theory and Constructions of Woodworking Machines, Moscow, Forest Industry, 1984 (in Russian). [5] Obreshkov, P. Woodworking Machines

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Effect of man-made disturbances on understory plant richness of oak forests in Iran

Abstract

The purpose of this study was to investigate the impacts of disturbance degree on the species richness and species diversity of oak forests in the Kurdistan Province (Iran). The study ran on three treatments: undisturbed, moderately disturbed, and highly disturbed. For each treatment, there were selected three forest patches with similar physiographic conditions and on each patch there were specified three 400 m2 plots for recording floristic data. The species’ name and the abundance of herbaceous species were recorded on 5 micro plots sized 1.5 × 1.5 m for each sample. Menhinick, Margalef, the number of species indices and also rarefaction, jackknife methods and species abundance distribution models were used to estimate the herbaceous species richness for the three treatments. The results showed that all the richness indices had the highest values for the undisturbed forests and the lowest values for the highly disturbed ones. Based on all models, undisturbed forests were showed more diverse than highly disturbed area. Generally the negative impact of human activities (wood cutting and grazing) on the herbaceous species richness was found much stronger in the highly disturbed forests and in moderately disturbed forests compared the undisturbed ones. With increasing destruction intensity, the herbaceous species richness in the oak forests decreased dramatically.

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Optimization of the Cutting Process of Wood-Based Agglomerated Materials by Abrasive Water-Jet

References BARCÍK, Š. (2007): Progresívna metóda obrábania dreva vodným lúčom. [Progressive method of wood manufacturing by water jet]. In: Proceedings of the conference “Woodcut Tools and Woodworking”. Zvolen, Slovakia. December 2007. 3-11. BARCÍK, Š. - KMINIAK, R. - ŠUSTEK, J. (2009): The influence of the parameters of native wood cutting process by abrasive water-jet on the kerf width, In: Proceedings of the 3rd International Scientific Conference “Woodworking Technique”. Zalesina, Croatia. 2-6 September 2009. 19

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The influence of initial tension on blunting of chain saw blades and cutting efficiency

. Kusiak W., Moliński K., Walkowiak R. 2012. Model zużycia paliwa przy pozyskaniu drewna sosnowego. Sylwan 3: 218–224. Maciak A. 2000. Forces acting on cutter of saw chain during wood cutting. Annals of Warsaw Agricultural University 36: 15–20. Maciak A. 2001. Wpływ parametrów konstrukcyjnych ogniw tnących piły łańcuchowej żłobikowej na wydajność skrawania drewna. Praca doktorska. SGGW, Wydział Inżynierii Produkcji, Warszawa. Maciak A. 2004. Influence of inclination angle of horizontal cutting edge of the chain saw link on cutting effects. Annals

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Analysis of natural-production conditions for timber harvesting in European North of Russia

References Ackerman, S., F., Ackerman, P., Williams, C., Nathi, C., 2017: Diesel Consumption and Carbon Balance in South African Pine Clear-Felling CTL Operations: a Preliminary Case Study. Croatian Journal of Forest Engineering, 38:65–72. Alam, M., Walsh, D., Strandgard, M., Brown, M., 2014: A Log-by-Log Productivity Analysis of Two Valmet 475EX Harvesters. International Journal of Forest Engineering, 25:14–22. Bergroth, J., Palander, T., Kärhä, K., 2006: Excavator-based harvesters in wood cutting operations in Fin-land. Forestry Studies, 45

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Linkage map construction and QTL analysis for Betula platyphylla Suk using RAPD, AFLP, ISSR and SSR

quantitative trait loci. Genetics 136: 1457-1468. ZHAN, Y., J. LI, J. LIU, L. LI, W. TENG, H. WANG, S. QIN and Y. LIU (1994): Study on green wood cutting propagation techniques of Betula platyphylla. Journal of Northeast Forestry University, 22 (2): 6-10. ZHAN, Y., T. SU, M. HAN and D. SUN (2006): A multiplex polymerase chain reaction method for rapid detection of foreign genes in transgenic birch (Betula platyphylla). Bulletin of Botanical Research 26 (4): 480-485. ZHANG, X., T. YIN, Q. ZHUGE, M. HUANG, L. ZHU and W. ZHAI

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