EN
The construction and stand testing of the treshing beater unit, which cooperates with a three-section rotating separator is described. The aim of the study was to estimate the degree of wheat and barley straw braking-up during threshing and separation. During the research, technical and technological conditions of the unit operation (capacity, peripheral speed of separating drums, and moisture of grain bulk) were changed. The results underwent statistical analysis. The studies allowed us to describe the character of straw grinding process. They also pointed out the directions of further investigations and possibilities of using such device in threshing machines and in grain harvesters.