At present, CNC machine tools are developing rapidly in the direction of higher precision, higher reliability, and maintenance-free. Behind it, key component technologies have played an important role in promoting the development of CNC machine tools. Bearings, ball screws, and linear guides are precision components that CNC machine tools cannot do without. They can be described as the heroes behind the machine tool industry.

There are many specifications and models of ball screw bearings, so what factors should we pay attention to when choosing a suitable model?

① Determine positioning accuracy;

② Determine the screw bearing lead according to the motor and speed requirements;

③ Check the nut size to determine the stroke and related screw bearing shaft end data;

④ Determine the average axial force and speed through load and speed distribution (acceleration and deceleration);

⑤ Determine the preload through the average axial force;

⑥ Expected life, axial load, and rotational speed determine the dynamic load rating;

⑦ The basic dynamic rated load, lead, critical speed, and DmN value limits determine the screw bearing outer diameter and nut form;

⑧ Outer diameter, nut, preload, load determination rigidity (machine design);

⑨ The ambient temperature and total length of the nut determine the thermal change and cumulative lead;

⑩ The screw bearing is rigid and the thermal displacement determines the pretension force;

⑪ The maximum speed of the machine tool, temperature rise time, and screw bearing specifications determine the motor driving torque and specifications.