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. Shown in Figure 2-3, 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. Ball screw tube joining it with the elbow as the return ball screw sales pipeline, 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 than the size of a small tube structure radial ball wire lever agent, but the manufacturing more complicated. 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. Ball screw structure: ball screw nut is rotary motion into linear motion commonly used gear. It is replaced by a sliding ball rolling in the screw nut, low friction ball screw having a good performance of composition: mainly by the screw, nut, ball, and circulator, labyrinth seals, and other components hole . How it works: the screw and nut processing there arc spiral groove, when they suit together to form a spiral raceway, and filled with balls in the raceway. The ball is rolling along the raceway, and for the cycle of circular motion through the circulator. Loop at both ends also played the role of stopper beads, to prevent the ball from falling out along the raceway. Ball screw phone manufacturers, Dongguan City, South Korea Taiwan (certified), Luoding ball screw provided by the Dongguan City, South Korea Taiwan Transmission Machinery Co., Ltd .. Dongguan City, South Korea Taiwan Transmission Machinery Co., Ltd. (www.dghantai.com) is an industry leader in Dongguan, Guangdong, machine tool accessories, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Korea and Taiwan transmission machinery leadership with the staff warmly welcome all inquiries negotiations, Korea and Taiwan to create a better future transmission machinery.