In graduating thesis brushcutter is presented as a tool for working in the forests, mainly as a tool for pre commercial thinning and sawing undergrowth, under electricity transmission lines. In the beginning of the thesis a historyof brushcutters and their development, is presented. As they evolved with the development of chain saws (the samw power unit), were at first very heavy and clumsy. Furthermore, there is presented a brief history of two leading manufacturers of clearing saws, Stihl and Husqvarna. Some improvementswere described, that have occurred since 1986 until today. More specifically, forestry technique for clearing saws were described, depending on the terrain on wich clearing was performed. In conclusion, the study is presented in which effects of experienced and inexperienced worker to work with clearing saw is compared. The average efficency of inexperienced worker was 181 m2/machine hour and efficency for experienced was 265 m2/machine hour.