The main parameters of the thread 1) the outer diameter d (large diameter) (D) - with the external thread crests coincide with the diameter of an imaginary cylindrical surface - also known as nominal diameter 2) the inner diameter (diameter) d1 (D1) - and outer coincide with the end of the thread diameter of the imaginary cylinder surface diameter ball screw, as the risk of cross-section of the strength calculation to calculate the diameter of 3) in diameter in the axial section between d2-- thick teeth and tooth width equal to the imaginary cylindrical surface at , approximately equal to the average diameter of the thread d2≈0.5 (d + d1) 4) P-- two adjacent tooth pitch corresponding axial distance between two points on the diameter of the cylindrical surface of the bus bar 5) lead (S) - the same helical line distance between two adjacent teeth in the axial diameter of the cylindrical surface of the corresponding bus between two points in recent years, an increasing number of ball screw is used for a wide variety of machines SFS ball screw One of transmission components to meet demand for high-precision and high-performance equipment, ball screw become the most widely used. In the CNC machine, the ball screw to increase the positioning accuracy and extend its life. DFI ball screw on the traditional mechanical, ball screw rod gradually replace Aikemusi. Usually with a ball screw preload to eliminate backlash when the machine is running, but if the ball screw is not installed at the time can not demonstrate its accuracy and longer life. This article focuses on the prevention of ball screw issues and problems, detailing some of the measurement program to help users identify abnormal causes backlash. Ball screw causes and prevention of the occurrence of the problem: The following describes the three main cause and how to prevent the ball screw in question. SFS ball screw drive machinery _ _ Korea and Taiwan 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) 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.