For example, the indicator of the dial indicator of the measuring screw does not swing when the screw rotates forward and backward, indicating that the screw does not move. If the dial indicator pointer swings, it indicates that the ball screw is moving. The difference between the maximum and minimum measured values of the dial indicator is the axial movement distance of the screw. At this time, we have to check whether the back cap of the support bearing is locked, whether the support bearing has worn out, and whether the preloaded bearing washer is suitable. If there is no problem with the bearing, just refit it with a pre-loaded washer.
If the bearing is damaged, the bearing needs to be replaced, refitted with a pre-loaded washer, and then the back cap is tightened. The size of the axial movement of the screw mainly lies in the accuracy of the preloaded washer of the supporting bearing. The most ideal state of the screw installation accuracy is that there is no positive and negative clearance, and the support bearing should have an interference of about 0.02mm.
