#### Ball Screw Selection and Calculations University of Utah

ME EN 7960 Precision Machine Design Ball Screw Calculations 4 4 Driving Torque to Obtain Thrust 2πη F l T = a T driving torque [Nm] Fa thrust force [N] l screw lead [m] η efficiency Source THK Co Ltd 3 ME EN 7960 Precision Machine Design Ball Screw Calculations 4 5 Required Thrust • The thrust is the sum of all forces acting in the axial direction Fa =FM Ff Fi