Problems in ball screw assembly and its solutions

As many people know a ball screw is not a simple apparatus. In fact there are a number of components with the whole thing being called a ball screw assembly. The two principal parts of a ball screw assembly would be the nut and the screw. The nut is carried up or down the screw when either of these two parts is rotating. Typically the rotational motion of the screw causes the nut to move sideward’s or the system may be swapped so that the ball screw is back-driven.

Ball screw assemblies are not excessively complicated. Within the nut there are ball bearings, which move around the ball nut. The screw resembles a carpentry screw, having carved threads along its length. Inside the nut there are also matching grooves which direct the motion of the balls. As soon as the screw begins to move this sets the ball bearings into motion, and this is responsible for the motion of the nut along the screw. The ball screw assembly features a deflector at its base which acts to keep the balls circulating within the barrel of the nut. Once the ball moves to the end of the nut the deflector reverses its motion, sending it back to the top of the nut. In other words this is a closed circuit, or a cycle of ball bearings in the barrel of the nut. In many ways this is the basis 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. On each occasion that the ball nut has moved the whole way along the screw, each thread on the screw has been run over by every single ball bearing once. But also, the threads of the nut casing may have been run over by the ball bearings a number of times an amount that can be calculated by comparing the length of the screw to the nut. Therefore the proportional difference between the nut thread count and the screw thread count should indicate the additional wear on the interior threads of the nut and will therefore give you an indication of how quickly the ball nut will wear out in comparison to the ball screw. Alternative ball screw assemblies will therefore have different life expectancies, depending on the figures involved.