Screw support bearings gap detection and repair, such as a dial indicator to measure the screw in the screw does not swing to reverse rotation pointer, indicating that the screw does not traverse. Such as dial pointer swing screw dispenser business, explained the phenomenon of the screw has a rocky ledge. The difference between the maximum and minimum measurement dial indicator value is the axial screw ran away. At this point, we have to check whether the support bearing caps lock back, whether support bearings are worn failure, pre-load bearing washers are appropriate. If the bearing is no problem, just re-do the pre-load washer with it. If the bearing is damaged, you need to replace the bearing off again to do with pre-load washer, then back cap back tight. Screw axial movement lies in the accuracy of the size of the support bearing pre-load washers. Screw mounting accuracy of the ideal state is no gap between the positive and negative Which CNC lathe screw support bearings also have 0.02mm about interference. 1) the outer loop: the outer loop is a ball at the end of the cycle through the outer surface of the spiral groove nut or screw nut between intubation return to re-enter the cycle. As shown in Figure 2-3 gantry screw business, the outer loop of the ball screw nut ball circulation by way of return when the main cover type, tube and spiral trough. Common methods cover the outer loop type; intubation; spiral trough. Cover type, processing a longitudinal hole in the nut, as the ball of the return channel, opened on both ends of the ball nut cover backhaul mouth, thus the ball into the return pipe to form a loop. Tube type, it uses as a return pipe bends, this structure technology is good, but because the pipe protruding nuts in vitro, radial size larger. Spiral trough, which is milled in a spiral groove on the outer nut, through holes drilled at both ends of the slot and threaded raceway tangent form return channel, this structure is smaller than the radial size of the cannula structure, but manufacture more complex. Ball outer loop outer loop structure and manufacturing process is simple and widely used. The disadvantage is that it is difficult to do raceway smooth seams, affect the smooth ball raceway. Dragon screw price, screw, Korea and Taiwan transmission machinery provided by the Dongguan City, Transmission Machinery Co., Korea and Taiwan. Dongguan City, South Korea Taiwan Transmission Machinery Co., Ltd. (www.dghantai.com) strong, credible, in Dongguan, Guangdong and other machine tool accessories industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Korea Taiwan transmission machinery and you hand into the brilliant, for a better future!