The review of the most common fuses to limit the torque used on rotary forestry machines used in difficult conditions, including felling, is performed. A review of the designs of the most common fuses on these machines for limiting the torque: pin, cam and friction is carried out. Both the advantages and disadvantages of these fuses are considered. The necessity of using more advanced fuses for torque limitation on rotary forestry machines with a firing accuracy factor less than that of the standard torque fuses currently used is identified. It is proposed to use fuses with increased accuracy of operation with inclined grooves and pins on rotary forestry machines. The design of a promising fuse for limiting torque using inclined grooves and pins is considered. The technique of an experiment to study the accuracy factor of the fuse at a specially designed stand is presented. The results of experiments to identify the dependence of the accuracy factor on the angle of the groove of the fuse. Further ways are suggested for improving the design of a fuse with increased accuracy of operation with inclined grooves and pins.

Currently, in the Russian Federation, a large number of areas require reforestation. Introduction of new technologies in artificial reforestation (planting seedlings with a closed root system) requires the use of new means of mechanization when planting seedlings. The assessment of the degree of similarity and difference of the selected structures was carried out on the basis of statistical analysis (hierarchical classification). The country's industry practically does not produce tree planting machines for planting seedlings with a closed root system. Imported specimens of forest planting machines are expensive, require aggregation with heavy equipment, which is practically absent in forestry. In addition, climatic conditions may also be a limitation in the use of imported equipment. In connection with the above, Voronezh State University of Forestry and Technologies has developed designs of universal planting machines with rotary and chain planting mechanisms. They enable planting of both standard seedling and seedlings with closed root system. The use of universal tree planting machines in forestry enables to keep one tree planting machine instead of two specialized ones. This will significantly save on maintenance and storage of mechanisms