Ball Screw Assemblies

Ball Screw Assemblies

As many people know a ball screw cannot be termed a simple item. In fact there are many parts with the whole thing being called a ball screw assembly. The most important sections of a ball screw assembly are the screw and the nut. The nut is carried up or down the screw once one of these two parts is in motion. In general the screw’s revolutions is changed into the straight line movement of the nut, or the system may be swapped a process that is called back-driving.
Ball screw assemblies aren’t really exceptionally intricate.
Within the nut there are ball bearings, and these can rotate through the assembly.
The appearance of the screw is typical, with threads along its length.
Within the nut grooves are also cut that are responsible for steering the ball bearings. When the screw is turned this sets the ball bearings into motion, and this is responsible for the motion of the nut along the screw. The ball screw assembly also contains a deflector that ensures the ball bearings continuously return to the top of the nut. When a ball reaches the bottom of the nut the deflector returns it to the opposite end of the nut. In other words this is a closed circuit, with the balls constantly recirculating inside the nut casing. This is the core of the ball screw assembly.
The load and the potential life span can be determined of ball screw assemblies through acquiring the amount of ball screw threads along with the amount of threads inside the nut. For each time that the ball nut has moved the whole way along the screw, each section of screw thread has been traversed by each of the ball bearings one time only. But also, the threads within the nut may have been run over by the ball bearings a number of times a number that is determined by how much longer the screw is than the nut. Therefore the ratio of the threads on the screw to the threads on the nut can give an indication the extra amount of wear on the ball nut which should help you to work out how long the ball nut will last when compared with the ball screw. Different ball screw assemblies will therefore have different life expectancies, as can be calculated using the relative thread counts.