Selection is a key step to ensure the best performance of the ball screw, and comprehensive considerations are required:
Load: The size and direction of axial load (thrust), radial load, and moment load. This determines the nominal diameter of the screw and the specification of the nut.
Accuracy level: According to the requirements of the positioning accuracy and repeatability of the equipment, select the corresponding accuracy level (such as C0, C1, C3, C5, C7, C10, etc., the smaller the number, the higher the accuracy).
Lead: The distance the nut moves when the screw rotates one circle. The lead affects the moving speed, resolution, and required drive torque (small lead means high resolution, slow speed, and high torque; large lead means the opposite).
Speed and acceleration: Maximum operating speed and acceleration requirements, considering the critical speed (DN value limit) and avoiding resonance.
Expected life: Calculate the required rated dynamic load and life (usually in millions of revolutions) based on the operating time and load cycle.
Rigidity requirements: The system is sensitive to axial deformation, and preload may be required to improve rigidity, but preload will increase friction and temperature rise.
Working environment: Temperature, humidity, dust, corrosive media, etc., affect material selection, sealing form and lubrication method.
Installation space restrictions: Screw length, nut size, support method (fixed-supported, fixed-fixed, etc.).
Nut form: Flange nut, cylindrical nut, compact nut, nut with preload adjustment, etc.
Reflux method: External circulation (suitable for high speed), internal circulation (compact structure), end cover type, etc.
