The relevance of the requirements for improving the quality of seed cleaning and calibration machines in seed production is emphasized, in this direction, a constructive improvement option has been developed as a working hypothesis for the purpose of conducting research. conditions are created for the passage of the entire cleaned and calibrated seed material through a separate sieve at the separation and purification stage. During the study, the specific load of the grain mass, the frequency of vibrations of the working organ and the angle of inclination relative to the horizon changed, the fraction separated from the lower layer of the grain mass changed, the effect on the quantity was determined.