During the operation of a surface grinder, any malfunctions encountered need to be promptly addressed. When the spindle of a surface grinder is found to be hot, it is important to first understand the main reason for this phenomenon?

If the temperature of the surface grinder spindle is within the range that the hand can tolerate after a long time of operation (about 60-70 degrees), it is generally normal, which is also called constant temperature. If the temperature rises quickly after a short time of operation, and the hand dare not touch it, it is a fault. Under normal circumstances, the overheating of the spindle of a surface grinder is caused by the lack or insufficient lubricating oil layer of the spindle bearing, which leads to the rapid generation of heat from metal friction. Insufficient lubricating oil causes dry friction to generate thermal energy. Excessive feed of the grinding wheel on the grinding machine exceeds the range that the lubricating oil film between the bearings can withstand, resulting in dry friction. Poor scraping and contact during maintenance of the spindle and bearing shells, as well as tight assembly of rolling bearings, are common reasons for the spindle of the surface grinder to become hot.

By understanding these reasons, you will know how to deal with the problem of the spindle of the surface grinder becoming hot.