The paper analyzes the existing theoretical research of corn seed sepa-ration and calibration processes. The machines, tools and equipmentthat implement the process were studied. An innovative sieve with openings in the Cassini oval shape was proposed for the economicalseparation and calibration of corn seeds. The results of operation of theproposed sieve in the operating conditions of Kharkiv Feed Mill onBSH-100 serial separators were considered. The study of the effective-ness of sifting corn seeds through the holes of the sieves was carried outin partnership with the State University “Ukrainian Research Instituteof Forecasting and Testing of Agricultural Production Techniques andTechnologies named after Leonid Pohorily” (Kharkiv Branch). The useof sieves with openings in the Cassini oval shape, instead of classic cir-cular base openings, was found to result in an increase in throughputcapacity of the sieve and open area of up to 20%.