At present, CNC machine tools are developing rapidly towards higher precision, higher reliability and maintenance-free. Behind this, key component technology plays an important role in boosting it. Bearings, ball screws and linear guides are indispensable precision components for CNC machine tools. They can be called the unsung heroes of the machine tool industry.

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

① Determine positioning accuracy;

② Determine the lead of the screw bearing through 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 the load and speed distribution (acceleration and deceleration);

⑤ Determine the preload through the average axial force;

⑥ Determine the dynamic rated load based on the expected life, axial load, and speed;

⑦ Determine the outer diameter of the screw bearing and the nut type based on the basic dynamic rated load, lead, critical speed, and DmN value limit;

⑧ Determine the rigidity (machine design) based on the outer diameter, nut, preload, and load;

⑨ Determine the thermal change and cumulative lead based on the ambient temperature and the total length of the nut;

⑩ Determine the pretension based on the rigidity of the screw bearing and the thermal displacement;

⑪ Determine the motor drive torque and specifications based on the maximum speed of the machine tool, the temperature rise time, and the screw bearing specifications.