Abstract
For the balancing effect of the aerostatic lead screw, the drunkenness of the female screw is not directly transferred from the male screw; it can be reduced responding on the balance conditions of the load at each flank surface. In this research, an attempt is made to calculate the drunkenness of the aerostatic lead screw, based on the balance conditions of the load, where the shape of the flank surface is considered. Then, the drunkenness of the air-floating female screw is measured experimentally. The balancing effect was clarified from the comparison of the theoretically value and the experimental value.