Improper combination motor and ball screw (1) combined with weak or poor coupling itself rigid, resulting in rotational difference (relative rotation) between the screw and the motor makes. (2) if they fit with gear drive or drive structure is not rigid, available Timing belt to drive to prevent slippage. (3) key loose, or anything improper with ball screw key, keyway, hub between all make a gap between these components. A2-2 not smooth actuation screw machining problems 1. (1) screw or nut bead groove surface roughness. (2) steel ball, screw or nut roundness out of tolerance. (3) The lead screw or nut errors or pitch circle diameter out of tolerance. Improper (4) the return conduit assembly. (5) steel ball size or uneven hardness. The above problems should not happen in a high-quality product is. Ball innovative product structure is to achieve a modest increase on the basis of speed and Pn derivative of thread ball screws are the best choice for high-speed. In the early 1989 we completed a large lead ball screw "Seven? Five" research, helix angle is f> large lead ball screw 9 ° ~ 17 ° has been able to mass production. However, due to genetic thread grinder Transmission Error "gene", lead the greater accuracy more difficult to increase the lead. Thus, taking into account the needs of accuracy, lead to a modest increase in Pn ball screw spline, such as the nominal diameter and lead of the match d0 × Pn to 40mm × 20mm, 50mm × 25mm, 50mm × 30mm L and other appropriate ball screw bar, line speed can reach 60m / min or more. The use of double thread is to increase the effective number of turns carrying the ball, thereby increasing the rigidity of ball screw and carrying capacity, improve ball nut in high-speed running smoothness. Although the large lead ball screw (f> 17 °) can achieve higher speed, but it's hard to meet the accuracy and processing (minus) speed. Hollow strong cold. At high speed thermal deformation of the screw shaft is a source of processing errors. Meanwhile, in order to improve the rigidity of the screw shaft system pre-stretching it will generate heat. Effective way to solve the heat problem is the coolant through the hollow screw internal forced circulation cooling. Hollow screw shaft also helps reduce inertia during high-speed operation, an increase torsional rigidity of the screw shaft. Beijing Machine Tool Research Institute in 1997 in cooperation with the Chengdu Tool Research Institute Baoji ball screw, complete large hollow ball screw hole machining, and worked out from alloy steel precision deep technology experience, can produce high-speed ball screw the application. Bidirectional ball screw, Korea and Taiwan transmission machinery (online consultation), ball screw provided by the Dongguan City, Transmission Machinery Co., Korea and Taiwan. Dongguan City, South Korea Taiwan Transmission Machinery Co., Ltd. (www.dghantai.com) (www.hantai168.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, the maximum to meet customer needs. Transmission machinery in Korea and Taiwan led the staff warmly welcome all inquiries negotiations, Korea and Taiwan to create a better future transmission machinery.