The results of laboratory studies confirming the possibility of preliminary separation of free grain from the stripped grain heap before it enters the threshing chamber of a combine harvester are presented. For example, it has been established that the maximum free grain passage through the holes of the lath bottom is 68, 7% with a width of its holes of 8 mm and a length of 160 mm. The length increase of the lath bottom of the inclined chamber of the combine harvester up to 1182 mm ensures a complete separation of grain from the heap and exclude the possibility of its falling into the threshing chamber.

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