1, With the load to determine the diameter. Motor performance parameters include the output torque, if it is equipped with a reducer should be calculated (considering efficiency), calculate how much thrust needed in the actual working conditions, ball screw sample (get from the manufacturers) has the load parameters (ie thrust parameters, general marked as dynamic load and static load, you can see the former), select the nominal diameter of ball screw.
2, With linear speed and rotation speed to determine the ball screw lead. Motor is determined to know the output speed, consider the maximum linear speed you needed, the motor speed (if equipped with a reducer and then divided by the reduction ratio) multiplied by screw lead is linear speed, which is greater than the required value.
3, According to the actual needs to determine the ball screw length (total length = working stroke + nut length + safety margin + installation length + connection length + margin). If you increase the protection, such as protective cover, the need to take protective cover expansion ratio (usually 1:8, that is the maximum elongation of the protective cover divided by 8) into account.
4, According to the actual needs to determine the ball screw precision. General machine selection C7 or less, machine tools to choose the C5 more (corresponding domestic standards generally P5 ~ P4 and P4 ~ P3 level, see specific samples).
5, With installation conditions and dimensions structure and others to determine the ball screw nut forms (nuts have many structures, different nuts have slightly different structure sizes, selection depending on the situation, it is recommended not to choose too special, in case something wrong that repair or replace parts of nowhere).
6, Select the installation method (end). This installation part can be designed yourself, or buy the ready-made, with standard mounting base. Design yourself pay attention to the stress state, bearing the best choice for 7000 or 3000 series, because the screw working is mainly bear the axial force, radial force to try to avoid.
7, Consider the guide part and the installation capacity. Recommended the guide part matched with ball screw and select ball linear guides, of course the linear axis and linear bearing of collocation is the relative economic choice.
Source: http://www.machineballscrew.com Ball Screw Bearing Assemblies.
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