The ball screw is a precision mechanical component designed for the highly efficient conversion between rotary and linear motion. Its operating principle can be summarized as follows: this conversion is achieved through the rolling interaction of ball bearings within the helical raceway between the screw shaft and the nut.
When the screw shaft acts as the driving component, its rotation causes the nut to translate along the screw's axis, with the distance traveled determined by the screw's lead and its angle of rotation. This linear motion is then transmitted to the passive workpiece or load, which is connected to the nut via a nut housing or mounting block.
Furthermore, ball screw assemblies are available in a wide range of standardized designs to meet diverse application requirements. Key characteristics such as the ball recirculation method and the preload level can be selected to optimize performance for specific uses.
Ball screws are primarily categorized into two types: precision ground ball screws and cold-rolled ball screws. The former are manufactured through a high-precision grinding process, resulting in superior accuracy and performance, while the latter are formed using a high-precision cold-rolling process, offering a cost-effective solution. Different accuracy grades are available within each category for users to select based on their needs.