Ball bearing common way of ball screw according to the situation by force at work, often screw supporting the thrust bearing and radial ball bearing assembly, which is supported in the following ways: 1, single push of a single push stop thrust bearing and preload were installed at both ends of the ball screw. It can improve the axial stiffness of the ball screw; when pre-stretched install preload large, so bear only pulling work when the screw. 2, one pair of push-push-push attached to both ends of the thrust bearing and radial ball bearings portfolio, the screw has a maximum stiffness, which can be used at both ends of double bearing, ball screw, first-served basis and radial thrust bearing ball bearings, and top clamping force is applied. This method is suitable for high rigidity, high-speed high-precision precision lead screw drive system. However, this structure allows the thermal deformation mode conversion screw preload the thrust bearing, thus requiring stents increase the carrying capacity and stiffness of the thrust bearing design. Ball Selection Step 1. Determine the positioning accuracy 2, to determine by the motor and lead screw speed of claim 3, view the nut size determination of the shaft end travel and related data 4. distribution (acceleration and deceleration by the load and speed ) to determine the average axial force and speed 5, 6 to determine the pre-pressure, life expectancy, buy a ball screw, the axial thrust load by the average speed determining dynamic load rating 7, the basic dynamic load rating, lead, Mianyang ball screw, the critical speed, DmN value limits determine the outer diameter of the screw and nut in the form of 8, diameter, nuts, pre-press, how much ball screws, the load is determined rigidity (machine design) 9, the ambient temperature, the nut total length determine the thermal cumulative change and lead 10, lead screw rigidity, thermal displacement determined pre-tension 11, highest machine speed, rise time, screw specification determines that the motor driving torque and specifications ball screw, Shandong Fu Jun (certified), Mianyang Ball is provided by Mechanical Technology Co., Ltd. Shandong Fu Jun. Machinery Co., Ltd. Shandong Fu Jun (www.fumotor.com) is an industry leader in Shandong Weifang, machinery and industrial products cooperation projects over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Shandong Fu Jun leadership with the staff warmly welcome all inquiries negotiations to create Shandong Fu Jun, a better future.