苏联学者Н·С·波尔马采夫在1954年出版的《铣削式开沟机》一书中,对这种开沟机的土垡抛掷作了理论研究,其要点如下:铣刀作等速圆周运动,同时作等速直线运动。土垡被铣削脱离母体以后,继续受外力作用,作等角加速度运动。速度由零连续地增加,直到最后被抛掷出去。该书将以上过程归纳为三条假设,即: Soviet scholar Н · С · Bolmasev in 1954, published in the “milling trencher,” a book on the trencher throwing a theoretical study of the soil, the main points are as follows: Mill for constant velocity circumference Exercise, at the same time for constant speed linear motion. Soil 垡 milling away from the mother, continue to be affected by external forces, for equiangular acceleration movement. The speed increases continuously from zero until it is finally thrown out. The book summarizes the above process into three hypotheses, namely: