There may be many reasons why the CNC lathe guide bearing temperature is too high. Here are some possible reasons:

1. Poor lubrication: Insufficient lubrication of CNC lathe guide bearings or poor lubricating oil quality may lead to increased friction, resulting in an increase in bearing temperature.

2. Bearing damage: Damage or severe wear of CNC lathe bearings will increase friction and heat, causing the bearing temperature to rise.

3. Improper bearing installation: Problems such as too tight or too loose installation of CNC lathe bearings and unbalanced installation may cause uneven stress on the bearings, which in turn can cause overheating.

4. Excessive workload: If the CNC lathe carries an excessive workload, it will increase the friction and heat generation of the bearings, causing the bearing temperature to rise.

5. Excessive bearing wear: Long-term use or improper use of CNC lathes may cause bearing surface wear, increase friction and heat, and increase bearing temperature.

6. Cooling system failure: If the cooling system of the CNC lathe fails or the coolant circulation is not smooth, the bearing will not be effectively cooled and the bearing temperature will increase.

7. The ambient temperature is too high: If the working environment temperature of the CNC lathe is too high, it will affect the heat dissipation of the bearings and increase the bearing temperature.

8. Excessive rotation speed: If the rotation speed of the CNC lathe is too high, it will increase the friction and heat generation of the bearing, causing the bearing temperature to rise.

To sum up, excessive temperature of CNC lathe guide bearings may be caused by poor lubrication, bearing damage, improper installation, excessive workload, excessive bearing wear, cooling system failure, excessive ambient temperature or excessive rotational speed, etc. , need to carefully investigate and solve the corresponding problems.