Effect of sawmen ’ professional experience on working time structure in pine-timber harvesting under conditions of the clear felling

Abstract: Effect of sawmen ’ professional expe-rience on working time structure in pine-timber harvesting under conditions of the clear felling. Times of particular operations in timber harvest-ing with the use of an internal combustion chain saw were analyzed depending on professional ex-perience of the fellers. Investigations were carried out on the two groups of sawmen: of many years’ experience and the beginners in the feller profes-sion. The both groups were compared in consider-ation of the felling and debranching times. Basing on carried out investigations and their analysis it was found that the percent time structure of ope-rations executed by both the experienced saw-men and the beginners was similar. The longest time was taken by debranching, the shortest time was spent on preparatory and additional opera-tions. However, the experienced sawmen usually execute all the operations in timber harvesting quicker, with the exception of debranching of trees with less branches; here the beginners were more effective. Key words: internal combustion chain saw, saw-man, timber harvesting, felling, debranching, time of operation