The preload force as a percentage of the dynamic axial load rating indicates the proportion of preload of a ball screw nut relative to the maximum dynamic load capacity of the spindle-nut combination. It is an important parameter for backlash-free operation, stiffness, and service life of the ball screw drive.
The preload force influences:
- Backlash-free operation: Higher preload reduces axial play
- Stiffness: Enhances power transmission and minimizes elastic deformation
- Load distribution: Even load absorption across all balls
- Service life: Excessive preload increases friction and wear; insufficient preload reduces precision
Practical Relevance
- Adjustable and preloaded nuts are often designed according to this ratio
- Important for high positioning accuracy in CNC machines, robotics, and measurement systems
- Serves to balance precision and service life